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* Merge tag 'clang-lto-v5.12-rc1' of ↵Linus Torvalds2021-02-231-0/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull clang LTO updates from Kees Cook: "Clang Link Time Optimization. This is built on the work done preparing for LTO by arm64 folks, tracing folks, etc. This includes the core changes as well as the remaining pieces for arm64 (LTO has been the default build method on Android for about 3 years now, as it is the prerequisite for the Control Flow Integrity protections). While x86 LTO enablement is done, it depends on some pending objtool clean-ups. It's possible that I'll send a "part 2" pull request for LTO that includes x86 support. For merge log posterity, and as detailed in commit dc5723b02e52 ("kbuild: add support for Clang LTO"), here is the lt;dr to do an LTO build: make LLVM=1 LLVM_IAS=1 defconfig scripts/config -e LTO_CLANG_THIN make LLVM=1 LLVM_IAS=1 (To do a cross-compile of arm64, add "CROSS_COMPILE=aarch64-linux-gnu-" and "ARCH=arm64" to the "make" command lines.) Summary: - Clang LTO build infrastructure and arm64-specific enablement (Sami Tolvanen) - Recursive build CC_FLAGS_LTO fix (Alexander Lobakin)" * tag 'clang-lto-v5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: kbuild: prevent CC_FLAGS_LTO self-bloating on recursive rebuilds arm64: allow LTO to be selected arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS arm64: vdso: disable LTO drivers/misc/lkdtm: disable LTO for rodata.o efi/libstub: disable LTO scripts/mod: disable LTO for empty.c modpost: lto: strip .lto from module names PCI: Fix PREL32 relocations for LTO init: lto: fix PREL32 relocations init: lto: ensure initcall ordering kbuild: lto: add a default list of used symbols kbuild: lto: merge module sections kbuild: lto: limit inlining kbuild: lto: fix module versioning kbuild: add support for Clang LTO tracing: move function tracer options to Kconfig
| * kbuild: lto: fix module versioningSami Tolvanen2021-01-141-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | With CONFIG_MODVERSIONS, version information is linked into each compilation unit that exports symbols. With LTO, we cannot use this method as all C code is compiled into LLVM bitcode instead. This change collects symbol versions into .symversions files and merges them in link-vmlinux.sh where they are all linked into vmlinux.o at the same time. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20201211184633.3213045-4-samitolvanen@google.com
* | kbuild: Add support to build overlays (%.dtbo)Viresh Kumar2021-02-041-0/+1
|/ | | | | | | | | | | Add support for building DT overlays (%.dtbo). The overlay's source file will have the usual extension, i.e. .dts, though the blob will have .dtbo extension to distinguish it from normal blobs. Acked-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/434ba2467dd0cd011565625aeb3450650afe0aae.1611904394.git.viresh.kumar@linaro.org
* .gitignore: docs: ignore sphinx_*/ directoriesMauro Carvalho Chehab2020-09-101-0/+3
| | | | | | | | | | | | | | | | | | The default way of building documentation is to use Sphinx toolchain installed via pip, inside the Kernel tree main directory. That's what's recommended by: scripts/sphinx-pre-install As it usually provides a better version of this package than the one installed, specially on LTS distros. So, add the directories created by running the commands suggested by the script. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/ac4e23d556c7d95cb11d6d5c605f43e425b2c3c7.1599660067.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* .gitignore: Add ZSTD-compressed filesAdam Borowski2020-07-311-0/+1
| | | | | | | | | | | | For now, that's arch/x86/boot/compressed/vmlinux.bin.zst but probably more will come, thus let's be consistent with all other compressors. Signed-off-by: Adam Borowski <kilobyte@angband.pl> Signed-off-by: Nick Terrell <terrelln@fb.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20200730190841.2071656-8-nickrterrell@gmail.com
* .gitignore: Do not track `defconfig` from `make savedefconfig`Paul Menzel2020-07-051-0/+3
| | | | | | | | | | | | Running `make savedefconfig` creates by default `defconfig`, which is, currently, on git’s radar, for example, `git status` lists this file as untracked. So, add the file to `.gitignore`, so it’s ignored by git. Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
* modpost: generate vmlinux.symvers and reuse it for the second modpostMasahiro Yamada2020-06-061-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The full build runs modpost twice, first for vmlinux.o and second for modules. The first pass dumps all the vmlinux symbols into Module.symvers, but the second pass parses vmlinux again instead of reusing the dump file, presumably because it needs to avoid accumulating stale symbols. Loading symbol info from a dump file is faster than parsing an ELF object. Besides, modpost deals with various issues to parse vmlinux in the second pass. A solution is to make the first pass dumps symbols into a separate file, vmlinux.symvers. The second pass reads it, and parses module .o files. The merged symbol information is dumped into Module.symvers in the same way as before. This makes further modpost cleanups possible. Also, it fixes the problem of 'make vmlinux', which previously overwrote Module.symvers, throwing away module symbols. I slightly touched scripts/link-vmlinux.sh so that vmlinux is re-linked when you cross this commit. Otherwise, vmlinux.symvers would not be generated. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
* .gitignore: add SPDX License IdentifierMasahiro Yamada2020-03-251-0/+1
| | | | | | | Add SPDX License Identifier to all .gitignore files. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* selftest/lkdtm: Use local .gitignoreChristophe Leroy2020-03-021-4/+0
| | | | | | | | | | | | | Commit 68ca0fd272da ("selftest/lkdtm: Don't pollute 'git status'") introduced patterns for git to ignore files generated in tools/testing/selftests/lkdtm/ Use local .gitignore file instead of using the root one. Fixes: 68ca0fd272da ("selftest/lkdtm: Don't pollute 'git status'") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
* selftest/lkdtm: Don't pollute 'git status'Christophe Leroy2020-02-201-0/+4
| | | | | | | | | | | Commit 46d1a0f03d66 ("selftests/lkdtm: Add tests for LKDTM targets") added generation of lkdtm test scripts. Ignore those generated scripts when performing 'git status' Fixes: 46d1a0f03d66 ("selftests/lkdtm: Add tests for LKDTM targets") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
* modpost: dump missing namespaces into a single modules.nsdeps fileMasahiro Yamada2019-11-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The modpost, with the -d option given, generates per-module .ns_deps files. Kbuild generates per-module .mod files to carry module information. This is convenient because Make handles multiple jobs in parallel when the -j option is given. On the other hand, the modpost always runs as a single thread. I do not see a strong reason to produce separate .ns_deps files. This commit changes the modpost to generate just one file, modules.nsdeps, each line of which has the following format: <module_name>: <list of missing namespaces> Please note it contains *missing* namespaces instead of required ones. So, modules.nsdeps is empty if the namespace dependency is all good. This will work more efficiently because spatch will no longer process already imported namespaces. I removed the '(if needed)' from the nsdeps log since spatch is invoked only when needed. This also solves the stale .ns_deps problem reported by Jessica Yu: https://lkml.org/lkml/2019/10/28/467 Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Tested-by: Jessica Yu <jeyu@kernel.org> Acked-by: Jessica Yu <jeyu@kernel.org> Reviewed-by: Matthias Maennich <maennich@google.com> Tested-by: Matthias Maennich <maennich@google.com>
* Merge tag 'modules-for-v5.4' of ↵Linus Torvalds2019-09-221-0/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux Pull modules updates from Jessica Yu: "The main bulk of this pull request introduces a new exported symbol namespaces feature. The number of exported symbols is increasingly growing with each release (we're at about 31k exports as of 5.3-rc7) and we currently have no way of visualizing how these symbols are "clustered" or making sense of this huge export surface. Namespacing exported symbols allows kernel developers to more explicitly partition and categorize exported symbols, as well as more easily limiting the availability of namespaced symbols to other parts of the kernel. For starters, we have introduced the USB_STORAGE namespace to demonstrate the API's usage. I have briefly summarized the feature and its main motivations in the tag below. Summary: - Introduce exported symbol namespaces. This new feature allows subsystem maintainers to partition and categorize their exported symbols into explicit namespaces. Module authors are now required to import the namespaces they need. Some of the main motivations of this feature include: allowing kernel developers to better manage the export surface, allow subsystem maintainers to explicitly state that usage of some exported symbols should only be limited to certain users (think: inter-module or inter-driver symbols, debugging symbols, etc), as well as more easily limiting the availability of namespaced symbols to other parts of the kernel. With the module import requirement, it is also easier to spot the misuse of exported symbols during patch review. Two new macros are introduced: EXPORT_SYMBOL_NS() and EXPORT_SYMBOL_NS_GPL(). The API is thoroughly documented in Documentation/kbuild/namespaces.rst. - Some small code and kbuild cleanups here and there" * tag 'modules-for-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux: module: Remove leftover '#undef' from export header module: remove unneeded casts in cmp_name() module: move CONFIG_UNUSED_SYMBOLS to the sub-menu of MODULES module: remove redundant 'depends on MODULES' module: Fix link failure due to invalid relocation on namespace offset usb-storage: export symbols in USB_STORAGE namespace usb-storage: remove single-use define for debugging docs: Add documentation for Symbol Namespaces scripts: Coccinelle script for namespace dependencies. modpost: add support for generating namespace dependencies export: allow definition default namespaces in Makefiles or sources module: add config option MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS modpost: add support for symbol namespaces module: add support for symbol namespaces. export: explicitly align struct kernel_symbol module: support reading multiple values per modinfo tag
| * modpost: add support for generating namespace dependenciesMatthias Maennich2019-09-101-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds an option to modpost to generate a <module>.ns_deps file per module, containing the namespace dependencies for that module. E.g. if the linked module my-module.ko would depend on the symbol myfunc.MY_NS in the namespace MY_NS, the my-module.ns_deps file created by modpost would contain the entry MY_NS to express the namespace dependency of my-module imposed by using the symbol myfunc. These files can subsequently be used by static analysis tools (like coccinelle scripts) to address issues with missing namespace imports. A later patch of this series will introduce such a script 'nsdeps' and a corresponding make target to automatically add missing MODULE_IMPORT_NS() definitions to the module's sources. For that it uses the information provided in the generated .ns_deps files. Co-developed-by: Martijn Coenen <maco@android.com> Signed-off-by: Martijn Coenen <maco@android.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Matthias Maennich <maennich@google.com> Signed-off-by: Jessica Yu <jeyu@kernel.org>
* | .gitignore: ignore modules.order explicitlyMasahiro Yamada2019-08-211-1/+1
|/ | | | | | | | | | | The pattern '*.order' was added by commit c6025f4c8bbe ("kbuild: ignore *.order files") to ignore modules.order files. I do not see any other user of the '.order' extension. Ignore 'modules.order' explicitly instead of '*.order'. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* .gitignore: Add compilation database fileToru Komatsu2019-07-271-0/+3
| | | | | | | | | | | This file is used by clangd to use language server protocol. It can be generated at each compile using scripts/gen_compile_commands.py. Therefore it is different depending on the environment and should be ignored. Signed-off-by: Toru Komatsu <k0ma@utam0k.jp> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* kbuild: create *.mod with full directory path and remove MODVERDIRMasahiro Yamada2019-07-171-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While descending directories, Kbuild produces objects for modules, but do not link final *.ko files; it is done in the modpost. To keep track of modules, Kbuild creates a *.mod file in $(MODVERDIR) for every module it is building. Some post-processing steps read the necessary information from *.mod files. This avoids descending into directories again. This mechanism was introduced in 2003 or so. Later, commit 551559e13af1 ("kbuild: implement modules.order") added modules.order. So, we can simply read it out to know all the modules with directory paths. This is easier than parsing the first line of *.mod files. $(MODVERDIR) has a flat directory structure, that is, *.mod files are named only with base names. This is based on the assumption that the module name is unique across the tree. This assumption is really fragile. Stephen Rothwell reported a race condition caused by a module name conflict: https://lkml.org/lkml/2019/5/13/991 In parallel building, two different threads could write to the same $(MODVERDIR)/*.mod simultaneously. Non-unique module names are the source of all kind of troubles, hence commit 3a48a91901c5 ("kbuild: check uniqueness of module names") introduced a new checker script. However, it is still fragile in the build system point of view because this race happens before scripts/modules-check.sh is invoked. If it happens again, the modpost will emit unclear error messages. To fix this issue completely, create *.mod with full directory path so that two threads never attempt to write to the same file. $(MODVERDIR) is no longer needed. Since modules with directory paths are listed in modules.order, Kbuild is still able to find *.mod files without additional descending. I also killed cmd_secanalysis; scripts/mod/sumversion.c computes MD4 hash for modules with MODULE_VERSION(). When CONFIG_DEBUG_SECTION_MISMATCH=y, it occurs not only in the modpost stage, but also during directory descending, where sumversion.c may parse stale *.mod files. It would emit 'No such file or directory' warning when an object consisting a module is renamed, or when a single-obj module is turned into a multi-obj module or vice versa. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Nicolas Pitre <nico@fluxnic.net>
* .gitignore: exclude .get_maintainer.ignore and .gitattributesMasahiro Yamada2019-05-181-3/+5
| | | | | | | Also, sort the patterns alphabetically. Update the comment since we have non-git files here. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* .gitignore: add more all*.config patternsMasahiro Yamada2019-05-081-1/+6
| | | | | | | | | For completeness, ignore all the allconfig variants. I added a leading slash because they are only searched in the top of the tree. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* moduleparam: Save information about built-in modules in separate fileAlexey Gladkov2019-05-071-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Problem: When a kernel module is compiled as a separate module, some important information about the kernel module is available via .modinfo section of the module. In contrast, when the kernel module is compiled into the kernel, that information is not available. Information about built-in modules is necessary in the following cases: 1. When it is necessary to find out what additional parameters can be passed to the kernel at boot time. 2. When you need to know which module names and their aliases are in the kernel. This is very useful for creating an initrd image. Proposal: The proposed patch does not remove .modinfo section with module information from the vmlinux at the build time and saves it into a separate file after kernel linking. So, the kernel does not increase in size and no additional information remains in it. Information is stored in the same format as in the separate modules (null-terminated string array). Because the .modinfo section is already exported with a separate modules, we are not creating a new API. It can be easily read in the userspace: $ tr '\0' '\n' < modules.builtin.modinfo ext4.softdep=pre: crc32c ext4.license=GPL ext4.description=Fourth Extended Filesystem ext4.author=Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others ext4.alias=fs-ext4 ext4.alias=ext3 ext4.alias=fs-ext3 ext4.alias=ext2 ext4.alias=fs-ext2 md_mod.alias=block-major-9-* md_mod.alias=md md_mod.description=MD RAID framework md_mod.license=GPL md_mod.parmtype=create_on_open:bool md_mod.parmtype=start_dirty_degraded:int ... Co-Developed-by: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org> Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org> Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com> Acked-by: Jessica Yu <jeyu@kernel.org> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* .gitignore: add leading and trailing slashes to generated directoriesMasahiro Yamada2019-05-071-4/+4
| | | | | | | Clarify these directory paths are relative to the top of the source tree. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* kbuild: Add support for DT binding schema checksRob Herring2018-12-131-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds the build infrastructure for checking DT binding schema documents and validating dts files using the binding schema. Check DT binding schema documents: make dt_binding_check Build dts files and check using DT binding schema: make dtbs_check Optionally, DT_SCHEMA_FILES can be passed in with a schema file(s) to use for validation. This makes it easier to find and fix errors generated by a specific schema. Currently, the validation targets are separate from a normal build to avoid a hard dependency on the external DT schema project and because there are lots of warnings generated. Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Michal Marek <michal.lkml@markovi.net> Cc: linux-doc@vger.kernel.org Cc: devicetree@vger.kernel.org Cc: linux-kbuild@vger.kernel.org Signed-off-by: Rob Herring <robh@kernel.org>
* Merge tag 'kbuild-v4.17-2' of ↵Linus Torvalds2018-04-161-4/+3
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull more Kbuild updates from Masahiro Yamada: - pass HOSTLDFLAGS when compiling single .c host programs - build genksyms lexer and parser files instead of using shipped versions - rename *-asn1.[ch] to *.asn1.[ch] for suffix consistency - let the top .gitignore globally ignore artifacts generated by flex, bison, and asn1_compiler - let the top Makefile globally clean artifacts generated by flex, bison, and asn1_compiler - use safer .SECONDARY marker instead of .PRECIOUS to prevent intermediate files from being removed - support -fmacro-prefix-map option to make __FILE__ a relative path - fix # escaping to prepare for the future GNU Make release - clean up deb-pkg by using debian tools instead of handrolled source/changes generation - improve rpm-pkg portability by supporting kernel-install as a fallback of new-kernel-pkg - extend Kconfig listnewconfig target to provide more information * tag 'kbuild-v4.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kconfig: extend output of 'listnewconfig' kbuild: rpm-pkg: use kernel-install as a fallback for new-kernel-pkg Kbuild: fix # escaping in .cmd files for future Make kbuild: deb-pkg: split generating packaging and build kbuild: use -fmacro-prefix-map to make __FILE__ a relative path kbuild: mark $(targets) as .SECONDARY and remove .PRECIOUS markers kbuild: rename *-asn1.[ch] to *.asn1.[ch] kbuild: clean up *-asn1.[ch] patterns from top-level Makefile .gitignore: move *-asn1.[ch] patterns to the top-level .gitignore kbuild: add %.dtb.S and %.dtb to 'targets' automatically kbuild: add %.lex.c and %.tab.[ch] to 'targets' automatically genksyms: generate lexer and parser during build instead of shipping kbuild: clean up *.lex.c and *.tab.[ch] patterns from top-level Makefile .gitignore: move *.lex.c *.tab.[ch] patterns to the top-level .gitignore kbuild: use HOSTLDFLAGS for single .c executables
| * kbuild: rename *-asn1.[ch] to *.asn1.[ch]Masahiro Yamada2018-04-071-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Our convention is to distinguish file types by suffixes with a period as a separator. *-asn1.[ch] is a different pattern from other generated sources such as *.lex.c, *.tab.[ch], *.dtb.S, etc. More confusing, files with '-asn1.[ch]' are generated files, but '_asn1.[ch]' are checked-in files: net/netfilter/nf_conntrack_h323_asn1.c include/linux/netfilter/nf_conntrack_h323_asn1.h include/linux/sunrpc/gss_asn1.h Rename generated files to *.asn1.[ch] for consistency. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
| * .gitignore: move *-asn1.[ch] patterns to the top-level .gitignoreMasahiro Yamada2018-04-071-4/+1
| | | | | | | | | | | | | | These are common patterns where source files are parsed by the asn1_compiler. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
| * .gitignore: move *.lex.c *.tab.[ch] patterns to the top-level .gitignoreMasahiro Yamada2018-04-071-0/+2
| | | | | | | | | | | | | | | | These patterns are common to host programs that require lexer and parser. Move them to the top .gitignore. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Frank Rowand <frowand.list@gmail.com>
* | clang-format: add configuration fileMiguel Ojeda2018-04-111-0/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | clang-format is a tool to format C/C++/... code according to a set of rules and heuristics. Like most tools, it is not perfect nor covers every single case, but it is good enough to be helpful. In particular, it is useful for quickly re-formatting blocks of code automatically, for reviewing full files in order to spot coding style mistakes, typos and possible improvements. It is also handy for sorting ``#includes``, for aligning variables and macros, for reflowing text and other similar tasks. It also serves as a teaching tool/guide for newcomers. The tool itself has been already included in the repositories of popular Linux distributions for a long time. The rules in this file are intended for clang-format >= 4, which is easily available in most distributions. This commit adds the configuration file that contains the rules that the tool uses to know how to format the code according to the kernel coding style. This gives us several advantages: * clang-format works out of the box with reasonable defaults; avoiding that everyone has to re-do the configuration. * Everyone agrees (eventually) on what is the most useful default configuration for most of the kernel. * If it becomes commonplace among kernel developers, clang-format may feel compelled to support us better. They already recognize the Linux kernel and its style in their documentation and in one of the style sub-options. Some of clang-format's features relevant for the kernel are: * Uses clang's tooling support behind the scenes to parse and rewrite the code. It is not based on ad-hoc regexps. * Supports reasonably well the Linux kernel coding style. * Fast enough to be used at the press of a key. * There are already integrations (either built-in or third-party) for many common editors used by kernel developers (e.g. vim, emacs, Sublime, Atom...) that allow you to format an entire file or, more usefully, just your selection. * Able to parse unified diffs -- you can, for instance, reformat only the lines changed by a git commit. * Able to reflow text comments as well. * Widely supported and used by hundreds of developers in highly complex projects and organizations (e.g. the LLVM project itself, Chromium, WebKit, Google, Mozilla...). Therefore, it will be supported for a long time. See more information about the tool at: https://clang.llvm.org/docs/ClangFormat.html https://clang.llvm.org/docs/ClangFormatStyleOptions.html Link: http://lkml.kernel.org/r/20180318171632.qfkemw3mwbcukth6@gmail.com Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Andy Whitcroft <apw@canonical.com> Cc: Joe Perches <joe@perches.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kbuild: move include/config/ksym/* to include/ksym/*Masahiro Yamada2018-03-251-0/+1
| | | | | | | | | | | | The idea of using fixdep was inspired by Kconfig, but autoksyms belongs to a different group. So, I want to move those touched files under include/config/ksym/ to include/ksym/. The directory include/ksym/ can be removed by 'make clean' because it is meaningless for the external module building. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Nicolas Pitre <nico@linaro.org>
* .gitignore: ignore ASN.1 auto generated filesZhu Lingshan2018-02-141-0/+4
| | | | | | | | | | | | | when build kernel with default configure, files: generatenet/ipv4/netfilter/nf_nat_snmp_basic-asn1.c net/ipv4/netfilter/nf_nat_snmp_basic-asn1.h will be automatically generated by ASN.1 compiler, so No need to track them in git, it's better to ignore them. Signed-off-by: Zhu Lingshan <lszhu@suse.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* scripts/package: snap-pkg targetPaolo Pisati2017-12-121-0/+5
| | | | | | | | | | | | | | | | | | | | Following in footsteps of other targets like 'deb-pkg, 'rpm-pkg' and 'tar-pkg', this patch adds a 'snap-pkg' target for the creation of a Linux kernel snap package using the kbuild infrastructure. A snap, in its general form, is a self contained, sandboxed, universal package and it is intended to work across multiple distributions and/or devices. A snap package is distributed as a single compressed squashfs filesystem. A kernel snap is a snap package carrying the Linux kernel, kernel modules, accessory files (DTBs, System.map, etc) and a manifesto file. The purpose of a kernel snap is to carry the Linux kernel during the creation of a system image, eg. Ubuntu Core, and its subsequent upgrades. For more information on snap packages: https://snapcraft.io/docs/ Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* Merge tag 'kbuild-misc-v4.15' of ↵Linus Torvalds2017-11-181-0/+5
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild misc updates from Masahiro Yamada: - Clean up and fix RPM package build - Fix a warning in DEB package build - Improve coccicheck script - Improve some semantic patches * tag 'kbuild-misc-v4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: docs: dev-tools: coccinelle: delete out of date wiki reference coccinelle: orplus: reorganize to improve performance coccinelle: use exists to improve efficiency builddeb: Pass the kernel:debarch substvar to dpkg-genchanges Coccinelle: use false positive annotation coccinelle: fix verbose message about .cocci file being run coccinelle: grep Options and Requires fields more precisely Coccinelle: make DEBUG_FILE option more useful coccinelle: api: detect identical chip data arrays coccinelle: Improve setup_timer.cocci matching Coccinelle: setup_timer: improve messages from setup_timer kbuild: rpm-pkg: do not force -jN in submake kbuild: rpm-pkg: keep spec file until make mrproper kbuild: rpm-pkg: fix jobserver unavailable warning kbuild: rpm-pkg: replace $RPM_BUILD_ROOT with %{buildroot} kbuild: rpm-pkg: fix build error when CONFIG_MODULES is disabled kbuild: rpm-pkg: refactor mkspec with here doc kbuild: rpm-pkg: clean up mkspec kbuild: rpm-pkg: install vmlinux.bz2 unconditionally kbuild: rpm-pkg: remove ppc64 specific image handling
| * kbuild: rpm-pkg: keep spec file until make mrproperMasahiro Yamada2017-11-141-0/+5
| | | | | | | | | | | | | | | | | | | | | | If build fails during (bin)rpm-pkg, the spec file is not cleaned by anyone until the next successful build of the package. We do not have to immediately delete the spec file in case somebody may want to take a look at it. Instead, make them ignored by git, and cleaned up by make mrproper. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* | .gitignore: move *.dtb and *.dtb.S patterns to the top-level .gitignoreMasahiro Yamada2017-11-081-0/+2
| | | | | | | | | | | | | | | | | | | | Most of DT files are compiled under arch/*/boot/dts/, but we have some other directories, like drivers/of/unittest-data/. We often miss to add gitignore patterns per directory. Since there are no source files that end with .dtb or .dtb.S, we can ignore the patterns globally. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Rob Herring <robh@kernel.org>
* | .gitignore: sort normal pattern rules alphabeticallyMasahiro Yamada2017-11-081-21/+21
|/ | | | | | | | We are having more and more ignore patterns. Sort the list alphabetically. We will easily catch duplicated patterns if any. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Rob Herring <robh@kernel.org>
* kbuild: Add support to generate LLVM assembly filesVinícius Tinti2017-04-251-0/+1
| | | | | | | | | | | | | Add rules to kbuild in order to generate LLVM assembly files with the .ll extension when using clang. # from c code make CC=clang kernel/pid.ll Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com> Signed-off-by: Behan Webster <behanw@converseincode.com> Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* Merge branch 'misc' of ↵Linus Torvalds2016-08-021-0/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull misc kbuild updates from Michal Marek: - coccicheck script improvements by Luis Rodriguez and Deepa Dinamani - new coccinelle patches by Yann Droneaud and Vaishali Thakkar - debian packaging fixes by Wilfried Klaebe, Henning Schild and Marcin Mielniczuk * 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: Fix the Debian packaging script on systems with no codename builddeb: fix file permissions before packaging scripts/coccinelle: require coccinelle >= 1.0.4 on device_node_continue.cocci coccicheck: refer to Documentation/coccinelle.txt and wiki coccicheck: add support for requring a coccinelle version scripts: add Linux .cocciconfig for coccinelle coccicheck: replace --very-quiet with --quiet when debugging coccicheck: add support for DEBUG_FILE coccicheck: enable parmap support coccicheck: make SPFLAGS more useful coccicheck: move spatch binary check up builddeb: really include objtool binary in headers package coccinelle: catch krealloc() on devm_*() allocated memory coccinelle: recognize more devm_* memory allocation functions coccinelle: also catch kzfree() issues coccicheck: Allow for overriding spatch flags Coccinelle: noderef: Add new rules and correct the old rule
| * scripts: add Linux .cocciconfig for coccinelleLuis R. Rodriguez2016-07-221-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Coccinelle supports reading .cocciconfig, the order of precedence for variables for .cocciconfig is as follows: o Your current user's home directory is processed first o Your directory from which spatch is called is processed next o The directory provided with the --dir option is processed last, if used Since coccicheck runs through make, it naturally runs from the kernel proper dir, as such the second rule above would be implied for picking up a .cocciconfig when using 'make coccicheck'. 'make coccicheck' also supports using M= targets.If you do not supply any M= target, it is assumed you want to target the entire kernel. The kernel coccicheck script has: if [ "$KBUILD_EXTMOD" = "" ] ; then OPTIONS="--dir $srctree $COCCIINCLUDE" else OPTIONS="--dir $KBUILD_EXTMOD $COCCIINCLUDE" fi KBUILD_EXTMOD is set when an explicit target with M= is used. For both cases the spatch --dir argument is used, as such third rule applies when whether M= is used or not, and when M= is used the target directory can have its own .cocciconfig file. When M= is not passed as an argument to coccicheck the target directory is the same as the directory from where spatch was called. If not using the kernel's coccicheck target, keep the above precedence order logic of .cocciconfig reading. If using the kernel's coccicheck target, override any of the kernel's .coccicheck's settings using SPFLAGS. We help Coccinelle when used against Linux with a set of sensible defaults options for Linux with our own Linux .cocciconfig. This hints to coccinelle git can be used for 'git grep' queries over coccigrep. A timeout of 200 seconds should suffice for now. The options picked up by coccinelle when reading a .cocciconfig do not appear as arguments to spatch processes running on your system, to confirm what options will be used by Coccinelle run: spatch --print-options-only You can override with your own preferred index option by using SPFLAGS. Coccinelle supports both glimpse and idutils. Glimpse had historically provided the best performance, however recent benchmarks reveal idutils is performing just as well. Due to some recent fixes however you however will need at least coccinelle >= 1.0.6 if using idutils. Coccinelle carries a script scripts/idutils_index.sh which creates the idutils database with as follows: mkid -i C --output .id-utils.index If using just "--use-idutils" coccinelle expects your idutils database to be on the top level of the kernel as a file named ".id-utils.index". If you do not use this you can symlink your database file to it, or you can specify the database file following the "--use-idutils" argument. Examples: make SPFLAGS=--use-idutils coccicheck This assumes you have $srctree/.id-utils.index, where $srctree is the top level of the kernel. make SPFLAGS="--use-idutils /full-path/to/ID" coccicheck Here you specify the full path of the idutils ID database. Using .cocciconfig is possible, however given the order of precedence followed by Coccinelle, and since the kernel now carries its own .cocciconfig, you will need to use SPFLAGS to use idutils if desired. v4: o Recommend upgrade for using idutils with coccinelle due to some recent fixes. o Refer to using --print-options-only for testing what options are picked up by .cocciconfig reading. o Expand commit log considerably explaining *why* .cocconfig from two precedence rules are used when using coccicheck, and how to properly override these if needed. o Expand Documentation/coccinelle.txt v3: Expand commit log a bit more Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> Acked-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Michal Marek <mmarek@suse.com>
* | GCC plugin infrastructureEmese Revfy2016-06-071-0/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch allows to build the whole kernel with GCC plugins. It was ported from grsecurity/PaX. The infrastructure supports building out-of-tree modules and building in a separate directory. Cross-compilation is supported too. Currently the x86, arm, arm64 and uml architectures enable plugins. The directory of the gcc plugins is scripts/gcc-plugins. You can use a file or a directory there. The plugins compile with these options: * -fno-rtti: gcc is compiled with this option so the plugins must use it too * -fno-exceptions: this is inherited from gcc too * -fasynchronous-unwind-tables: this is inherited from gcc too * -ggdb: it is useful for debugging a plugin (better backtrace on internal errors) * -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h) * -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version variable, plugin-version.h) The infrastructure introduces a new Makefile target called gcc-plugins. It supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++). This script also checks the availability of the included headers in scripts/gcc-plugins/gcc-common.h. The gcc-common.h header contains frequently included headers for GCC plugins and it has a compatibility layer for the supported gcc versions. The gcc-generate-*-pass.h headers automatically generate the registration structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes. Note that 'make clean' keeps the *.so files (only the distclean or mrproper targets clean all) because they are needed for out-of-tree modules. Based on work created by the PaX Team. Signed-off-by: Emese Revfy <re.emese@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Michal Marek <mmarek@suse.com>
* gitignore: fix wordingKyeongmin Cho2016-04-281-1/+1
| | | | | | | | Git files are the files that we don't want to ignore even if they are dot-files. It must be "even if" but it says "even it". Signed-off-by: Kyeongmin Cho <korea.drzix@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* Merge branch 'misc' of ↵Linus Torvalds2015-09-081-0/+5
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull misc kbuild updates from Michal Marek: - deb-pkg: + module signing fix + dtb files are added to the package + do not require `hostname -f` to work during build + make deb-pkg generates a source package, bindeb-pkg has been added to only generate the binary package - rpm-pkg packages /lib/modules as well - new coccinelle patch and updates to existing ones - new stackusage & stackdelta script to collect and compare stack usage info (using gcc's -fstack-usage) - make tags understands trace_*_rcuidle() macros - .gitignore updates, misc cleanups * 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (27 commits) deb-pkg: add source package package/Makefile: move source tar creation to a function scripts: add stackdelta script kbuild: remove *.su files generated by -fstack-usage .gitignore: add *.su pattern scripts: add stackusage script kbuild: avoid listing /lib/modules in kernel spec file fallback to hostname in scripts/package/builddeb coccinelle: api: extend spatch for dropping unnecessary owner deb-pkg: simplify directory creation scripts/tags.sh: Include trace_*_rcuidle() in tags scripts/package/Makefile: rpmbuild is needed for rpm targets Kbuild: Add ID files to .gitignore gitignore: Add MIPS vmlinux.32 to the list coccinelle: simple_return: Add a blank line coccinelle: irqf_oneshot.cocci: Improve the generated commit log coccinelle: api: add vma_pages.cocci scripts/coccinelle/misc/irqf_oneshot.cocci: Fix grammar scripts/coccinelle/misc/semicolon.cocci: Use imperative mood coccinelle: simple_open: Use imperative mood ...
| * .gitignore: add *.su patternRasmus Villemoes2015-08-281-0/+1
| | | | | | | | | | | | | | Ignore the *.su files generated by using the gcc option -fstack-usage. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Michal Marek <mmarek@suse.com>
| * Kbuild: Add ID files to .gitignoreAndi Kleen2015-06-151-0/+3
| | | | | | | | | | | | | | | | | | | | I use GNU id-utils to find code (essentially a database backed grep), which generates an ID file to maintain its data. Add ID to the .gitignore file. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
| * gitignore: Add MIPS vmlinux.32 to the listFlorian Fainelli2015-06-151-0/+1
| | | | | | | | | | | | | | | | MIPS64 kernels builds will produce a vmlinux.32 kernel image for compatibility, ignore them. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
* | modsign: Use single PEM file for autogenerated keyDavid Woodhouse2015-08-071-0/+1
|/ | | | | | | | | | | | | | | The current rule for generating signing_key.priv and signing_key.x509 is a classic example of a bad rule which has a tendency to break parallel make. When invoked to create *either* target, it generates the other target as a side-effect that make didn't predict. So let's switch to using a single file signing_key.pem which contains both key and certificate. That matches what we do in the case of an external key specified by CONFIG_MODULE_SIG_KEY anyway, so it's also slightly cleaner. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: David Howells <dhowells@redhat.com>
* .gitignore: ignore *.tarAndrey Skvortsov2015-04-171-0/+1
| | | | | | | | | | | | | | | | | | | | | | Running make tar-pkg results in following: # Untracked files: # (use "git add <file>..." to include in what will be committed) # # linux-4.0.0-rc3-next-20150313-150225--x86.tar This patch makes git ignore *.tar files. Running 'git ls-files -i --exclude-standard' does not show any tar files excluded from tracking after the change. Signed-off-by: Andrey Skvortsov <andrej.skvortzov@gmail.com> Cc: Michal Marek <mmarek@suse.cz> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Boaz Harrosh <boaz@plexistor.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Benjamin Romer <benjamin.romer@unisys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* scripts/gdb: ignore byte-compiled python filesDaniel Thompson2015-02-171-0/+1
| | | | | | | | | | | | | | | | | Using the gdb scripts leaves byte-compiled python files in the scripts/ directory. These should be ignored by git. [jan.kiszka@siemens.com: drop redundant mrproper rule as suggested by Michal] Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Michal Marek <mmarek@suse.cz> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* gitignore: ignore tar-install build directoryAndrey Skvortsov2015-02-131-0/+5
| | | | | | | | | | | | | Have git ignore the Debian directory created when running: make tar-pkg / targz-pkg / tarbz2-pkg / tarxz-pkg Signed-off-by: Andrey Skvortsov <andrej.skvortzov@gmail.com> Cc: Michal Marek <mmarek@suse.cz> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Boaz Harrosh <boaz@plexistor.com> Cc: Andi Kleen <ak@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* .gitignore: Add Kdevelop4 project filesBoaz Harrosh2014-11-251-0/+3
| | | | | | | | | | | I'm not sure what is the costume with such IDE project files. Most might be dot-files. It is kind of annoying for the Kdevelop4 user. So please consider adding *.kdev4 files to be ignored? Signed-off-by: Boaz Harrosh <boaz@plexistor.com> [mmarek: Moved at the and and added a comment] Signed-off-by: Michal Marek <mmarek@suse.cz>
* kbuild: Support split debug info v4Andi Kleen2014-07-301-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is an alternative approach to lower the overhead of debug info (as we discussed a few days ago) gcc 4.7+ and newer binutils have a new "split debug info" debug info model where the debug info is only written once into central ".dwo" files. This avoids having to copy it around multiple times, from the object files to the final executable. It lowers the disk space requirements. In addition it defaults to compressed debug data. More details here: http://gcc.gnu.org/wiki/DebugFission This patch adds a new option to enable it. It has to be an option, because it'll undoubtedly break everyone's debuginfo packaging scheme. gdb/objdump/etc. all still work, if you have new enough versions. I don't see big compile wins (maybe a second or two faster or so), but the object dirs with debuginfo get significantly smaller. My standard kernel config (slightly bigger than defconfig) shrinks from 2.9G disk space to 1.1G objdir (with non reduced debuginfo). I presume if you are IO limited the compile time difference will be larger. Only problem I've seen so far is that it doesn't play well with older versions of ccache (apparently fixed, see https://bugzilla.samba.org/show_bug.cgi?id=10005) v2: various fixes from Dirk Gouders. Improve commit message slightly. v3: Fix clean rules and improve Kconfig slightly v4: Fix merge error in last version (Sam Ravnborg) Clarify description that it mainly helps disk size. Cc: Dirk Gouders <dirk@gouders.net> Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
* .gitignore: ignore Module.symvers in all directoriesZhao, Gang2014-04-161-2/+2
| | | | | | | | | | | | | | When using `make M=/path/to/driver modules` to build a module, file Module.symvers will be created in that directory, so it's better to ignore it in all directories. Slightly reordered, let specific file names behind general ones. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kyungsik Lee <kyungsik.lee@lge.com> Cc: Markus Trippelsdorf <markus@trippelsdorf.de> Signed-off-by: Zhao, Gang <gamerh2o@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
* gitignore: add all.configBorislav Petkov2014-02-111-0/+3
| | | | | | | | | | This is used by kbuild to load preset Kconfig options. We need to ignore it, otherwise git clean kills it. Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Michal Marek <mmarek@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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