| Commit message (Collapse) | Author | Age | Files | Lines |
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Adopt nvram module to reduce code duplication. This means CONFIG_NVRAM
becomes available to PPC64 builds. Previously it was only available to
PPC32 builds because it depended on CONFIG_GENERIC_NVRAM.
The IOC_NVRAM_GET_OFFSET ioctl as implemented on PPC64 validates the
offset returned by pmac_get_partition(). Do the same in the nvram module.
Note that the old PPC32 generic_nvram module lacked this test.
So when CONFIG_PPC32 && CONFIG_PPC_PMAC, the IOC_NVRAM_GET_OFFSET ioctl
would have returned 0 (always). But when CONFIG_PPC64 && CONFIG_PPC_PMAC,
the IOC_NVRAM_GET_OFFSET ioctl would have returned -1 (which is -EPERM)
when the requested partition was not found.
With this patch, the result is now -EINVAL on both PPC32 and PPC64 when
the requested PowerMac NVRAM partition is not found. This is a userspace-
visible change, in the non-existent partition case, which would be in
an error path for an IOC_NVRAM_GET_OFFSET ioctl syscall.
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull pstore updates from Kees Cook:
"Improvements and refactorings:
- Improve compression handling
- Refactor argument handling during initialization
- Avoid needless locking for saner EFI backend handling
- Add more kern-doc and improve debugging output"
* tag 'pstore-v4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
pstore/ram: Avoid NULL deref in ftrace merging failure path
pstore: Convert buf_lock to semaphore
pstore: Fix bool initialization/comparison
pstore/ram: Do not treat empty buffers as valid
pstore/ram: Simplify ramoops_get_next_prz() arguments
pstore: Map PSTORE_TYPE_* to strings
pstore: Replace open-coded << with BIT()
pstore: Improve and update some comments and status output
pstore/ram: Add kern-doc for struct persistent_ram_zone
pstore/ram: Report backend assignments with finer granularity
pstore/ram: Standardize module name in ramoops
pstore: Avoid duplicate call of persistent_ram_zap()
pstore: Remove needless lock during console writes
pstore: Do not use crash buffer for decompression
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Instead of running with interrupts disabled, use a semaphore. This should
make it easier for backends that may need to sleep (e.g. EFI) when
performing a write:
|BUG: sleeping function called from invalid context at kernel/sched/completion.c:99
|in_atomic(): 1, irqs_disabled(): 1, pid: 2236, name: sig-xstate-bum
|Preemption disabled at:
|[<ffffffff99d60512>] pstore_dump+0x72/0x330
|CPU: 26 PID: 2236 Comm: sig-xstate-bum Tainted: G D 4.20.0-rc3 #45
|Call Trace:
| dump_stack+0x4f/0x6a
| ___might_sleep.cold.91+0xd3/0xe4
| __might_sleep+0x50/0x90
| wait_for_completion+0x32/0x130
| virt_efi_query_variable_info+0x14e/0x160
| efi_query_variable_store+0x51/0x1a0
| efivar_entry_set_safe+0xa3/0x1b0
| efi_pstore_write+0x109/0x140
| pstore_dump+0x11c/0x330
| kmsg_dump+0xa4/0xd0
| oops_exit+0x22/0x30
...
Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Fixes: 21b3ddd39fee ("efi: Don't use spinlocks for efi vars")
Signed-off-by: Kees Cook <keescook@chromium.org>
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There is a plan to build the kernel with -Wimplicit-fallthrough and these
places in the code produced warnings, but because we build arch/powerpc
with -Werror, they became errors. Fix them up.
This patch produces no change in behaviour, but should be reviewed in
case these are actually bugs not intentional fallthoughs.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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GCC 8.1 warns about possible string truncation:
arch/powerpc/kernel/nvram_64.c:1042:2: error: 'strncpy' specified
bound 12 equals destination size [-Werror=stringop-truncation]
strncpy(new_part->header.name, name, 12);
arch/powerpc/platforms/ps3/repository.c:106:2: error: 'strncpy'
output truncated before terminating nul copying 8 bytes from a
string of the same length [-Werror=stringop-truncation]
strncpy((char *)&n, text, 8);
Fix it by using memcpy(). To make that safe we need to ensure the
destination is pre-zeroed. Use kzalloc() in the nvram code and
initialise the u64 to zero in the ps3 code.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Use kzalloc() in the nvram code, flesh out change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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It's slightly less error prone to use sizeof(*foo) rather than
specifying the type.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
[mpe: Consolidate into one patch, rewrite change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Use memdup_user() helper instead of open-coding to simplify the code.
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
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After commit c950fd6f201a kernel registers pstore write based on flag set.
Pstore write for powerpc is broken as flags(PSTORE_FLAGS_DMESG) is not set for
powerpc architecture. On panic, kernel doesn't write message to
/fs/pstore/dmesg*(Entry doesn't gets created at all).
This patch enables pstore write for powerpc architecture by setting
PSTORE_FLAGS_DMESG flag.
Fixes: c950fd6f201a ("pstore: Split pstore fragile flags")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Ankit Kumar <ankit@linux.vnet.ibm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
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Similar to the pstore_info read() callback, there were too many arguments.
This switches to the new struct pstore_record pointer instead. This adds
"reason" and "part" to the record structure as well.
Signed-off-by: Kees Cook <keescook@chromium.org>
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The argument list for the pstore_read() interface is unwieldy. This changes
passes the new struct pstore_record instead. The erst backend was already
doing something similar internally.
Signed-off-by: Kees Cook <keescook@chromium.org>
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This was entirely automated, using the script by Al:
PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>'
sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \
$(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)
to do the replacement at the end of the merge window.
Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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When we merge two contiguous partitions whose signatures are marked
NVRAM_SIG_FREE, We need update prev's length and checksum, then write it
to nvram, not cur's. So lets fix this mistake now.
Also use memset instead of strncpy to set the partition's name. It's
more readable if we want to fill up with duplicate chars .
Fixes: fa2b4e54d41f ("powerpc/nvram: Improve partition removal")
Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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If kmemdup fails, We need kfree *buff* first then return -ENOMEM.
Otherwise there is a memory leak.
Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Squash a bunch of sparse warnings by making things static.
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Like zlib compression in pstore, this patch added lzo and lz4
compression support so that users can have more options and better
compression ratio.
The original code treats the compressed data together with the
uncompressed ECC correction notice by using zlib decompress. The
ECC correction notice is missing in the decompression process. The
treatment also makes lzo and lz4 not working. So I treat them
separately by using pstore_decompress() to treat the compressed
data, and memcpy() to treat the uncompressed ECC correction notice.
Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
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The Makefile/Kconfig currently controlling compilation of this code is:
obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \
signal_64.o ptrace32.o \
paca.o nvram_64.o firmware.o
arch/powerpc/platforms/Kconfig.cputype:config PPC64
arch/powerpc/platforms/Kconfig.cputype: bool "64-bit kernel"
...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.
We don't replace module.h with init.h since the file already has that.
We delete the MODULE_LICENSE tag since that information is already
contained at the top of the file in the comments.
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Hari Bathini <hbathini@linux.vnet.ibm.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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'nvram_create_os_partition' should be 'nvram_create_partition'.
Use __func__ to have it right, as done elsewhere in this file.
Signed-off-by: Christophe Jaillet <christophe.jaillet@wanadoo.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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If 'nvram_write_header' fails, then 'new_part' should be freed, otherwise,
there is a memory leak.
Signed-off-by: Christophe Jaillet <christophe.jaillet@wanadoo.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Pstore only supports one backend at a time. The preferred
pstore backend is set by passing the pstore.backend=<name>
argument to the kernel at boot time. Currently, while trying
to register with pstore, nvram throws an error message even
when "pstore.backend != nvram", which is unnecessary. This
patch removes the error message in case "pstore.backend != nvram".
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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The patch was generated using fixed coccinelle semantic patch
scripts/coccinelle/api/memdup.cocci [1].
[1]: http://permalink.gmane.org/gmane.linux.kernel/2014320
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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While we are here, let us make timestamp related code y2038-safe.
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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This patch extends pstore, a generic interface to platform dependent
persistent storage, support for powernv platform to capture certain
useful information, during dying moments. Such support is already in
place for pseries platform. This patch re-uses most of that code.
It is a common practice to compile kernels with both CONFIG_PPC_PSERIES=y
and CONFIG_PPC_POWERNV=y. The code in nvram_init_oops_partition() routine
still works as intended, as the caller is platform specific code which
passes the appropriate value for "rtas_partition_exists" parameter.
In all other places, where CONFIG_PPC_PSERIES or CONFIG_PPC_POWERNV
flag is used in this patchset, it is to reduce the kernel size in cases
where this flag is not set and doesn't have any impact logic wise.
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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With minor checks, we can move most of the code for nvram
under pseries to a common place to be re-used by other
powerpc platforms like powernv. This patch moves such
common code to arch/powerpc/kernel/nvram_64.c file.
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
[mpe: Move select of ZLIB_DEFLATE to PPC64 to fix the build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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for tmp_part->header.name:
it is "Terminating null required only for names < 12 chars".
so need to limit the %.12s for it in printk
additional info:
%12s limit the width, not for the original string output length
if name length is more than 12, it still can be fully displayed.
if name length is less than 12, the ' ' will be filled before name.
%.12s truly limit the original string output length (precision)
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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When reading partitions, the length has to be translated from
big endian to the endian order of the host. Similarly, when writing
partitions, the length needs to be in big endian order.
The userspace tool 'nvram' needs a similar fix as it is reading
and writing partitions through /dev/nram :
http://sourceforge.net/p/powerpc-utils/mailman/message/31571277/
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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When error occurs, need return the related error code to let upper
caller know about it.
ppc_md.nvram_size() can return the error code (e.g. core99_nvram_size()
in 'arch/powerpc/platforms/powermac/nvram.c').
Also set ret value when only need it, so can save structions for normal
cases.
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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remove cast for kmalloc/kzalloc return value.
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Adapt the functions used to create and write to the RTAS-log partition
to work with any OS-type partition.
Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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The name field in the nvram_header can be < 12 chars, null-terminated,
or 12 chars without the null. Handle this safely.
Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Simplify creation and use of the NVRAM partition list.
Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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The nvram log partition stuff currently in nvram_64.c is really
pseries specific. It isn't actually used on anything else (despite
the fact that we ran the code to setup the partition on anything
except powermac) and the log format is specific to pseries RTAS
implementation. So move it where it belongs
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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This changes the function to use nvram_find_partition() instead
of doing the lookup "by hand". It also makes some of the logic
clearer and prints out more useful diagnostic information.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Existing code is nasty, has bugs etc... rewrite the function
more simply, and make it take the signature and optional
name of the partitions to remove as arguments, thus making
it a more generic utility.
We also try to remove a log partition that we find and is too
small rather than creating a duplicate.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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This error log stuff is really pseries specific. As a first step we move
the initialization of these variables to the caller of
nvram_create_partition(), which is also slightly reorganized so we
setup the free partition before we clear the new partition, so the
chance of an error during clear leaving us with invalid headers
is lessened.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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When creating a partition, we clear it entirely rather than
just the first two words since the previous code was rather
specific to the pseries log partition format.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Use BUILD_BUG_ON to ensure the structure representing a partition
header have the right size.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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This converts nvram_create_partition() to use a size in bytes
rather than blocks. It does the appropriate alignment internally
The size passed is also the data size (ie. doesn't include the
header anymore).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Replace nvram_create_os_partition() with a variant that takes
the partition name, signature and size as arguments.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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This moves a bunch of definitions out of asm/nvram.h to the files
that use them or just outright remove completely unused stuff.
We leave the partition signatures definitions, they will be useful
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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String constants that are continued on subsequent lines with \
are not good.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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The ioctl is only used for powermac systems and reads a partition
number from an array which is initialized at boot time way before the
nvram code is initialized. So it's safe to switch to unlocked_ioctl.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Mark all functions which are only called from nvram_init() __init.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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nvram_clear_error_log() calls ppc_md.nvram_write() even when
nvram_error_log_index is -1 (invalid). The nvram_write() function does
not check for a negative offset.
Check nvram_error_log_index as the other nvram log functions do.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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nvram_find_partition() has no user. The call site was removed in the
arch/powerpc move, but the function stayed. Remove it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Eliminate the use of error_log_cnt as a global var shared across
different directories. Pass it as a parameter instead.
Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
----
Respin of earlier patch, with the CONFIG_PSERIES junk removed from the
header file.
arch/powerpc/kernel/nvram_64.c | 10 +++++-----
arch/powerpc/platforms/pseries/rtasd.c | 7 ++++---
include/asm-powerpc/nvram.h | 6 ++++--
3 files changed, 13 insertions(+), 10 deletions(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Get rid of the jumbled usage of the no_logging flag. Its use
spans several directories, and is incorrectly/misleadingly
documented. Instead, two changes:
1) nvram will accept error log as soon as its ready.
2) logging to nvram stops on the first fatal error reported.
Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
----
arch/powerpc/kernel/nvram_64.c | 8 --------
arch/powerpc/platforms/pseries/rtasd.c | 14 ++++++--------
2 files changed, 6 insertions(+), 16 deletions(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Forward declarations serve no purpose in this file.
Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
----
arch/powerpc/kernel/nvram_64.c | 5 -----
1 file changed, 5 deletions(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>
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