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* parisc: fix interruption handler to respect pagefault_disable()Helge Deller2013-10-131-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | Running an "echo t > /proc/sysrq-trigger" crashes the parisc kernel. The problem is, that in print_worker_info() we try to read the workqueue info via the probe_kernel_read() functions which use pagefault_disable() to avoid crashes like this: probe_kernel_read(&pwq, &worker->current_pwq, sizeof(pwq)); probe_kernel_read(&wq, &pwq->wq, sizeof(wq)); probe_kernel_read(name, wq->name, sizeof(name) - 1); The problem here is, that the first probe_kernel_read(&pwq) might return zero in pwq and as such the following probe_kernel_reads() try to access contents of the page zero which is read protected and generate a kernel segfault. With this patch we fix the interruption handler to call parisc_terminate() directly only if pagefault_disable() was not called (in which case preempt_count()==0). Otherwise we hand over to the pagefault handler which will try to look up the faulting address in the fixup tables. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # v3.0+ Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
* parisc: remove unused syscall_ipi() function.Helge Deller2013-10-131-5/+0
| | | | Signed-off-by: Helge Deller <deller@gmx.de>
* parisc: kill SMP single function call interruptJiang Liu2013-10-131-7/+1
| | | | | | | | | | | | Commit 9a46ad6d6df3b54 "smp: make smp_call_function_many() use logic similar to smp_call_function_single()" has unified the way to handle single and multiple cross-CPU function calls. Now only one interrupt is needed for architecture specific code to support generic SMP function call interfaces, so kill the redundant single function call interrupt. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Cc: Jiang Liu <liuj97@gmail.com> Signed-off-by: Helge Deller <deller@gmx.de>
* parisc: Export flush_cache_page() (needed by lustre)Geert Uytterhoeven2013-10-131-0/+1
| | | | | | | ERROR: "flush_cache_page" [drivers/staging/lustre/lustre/libcfs/libcfs.ko] undefined! Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Helge Deller <deller@gmx.de>
* Merge branch 'for-linus' of ↵Linus Torvalds2013-09-061-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial tree from Jiri Kosina: "The usual trivial updates all over the tree -- mostly typo fixes and documentation updates" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (52 commits) doc: Documentation/cputopology.txt fix typo treewide: Convert retrun typos to return Fix comment typo for init_cma_reserved_pageblock Documentation/trace: Correcting and extending tracepoint documentation mm/hotplug: fix a typo in Documentation/memory-hotplug.txt power: Documentation: Update s2ram link doc: fix a typo in Documentation/00-INDEX Documentation/printk-formats.txt: No casts needed for u64/s64 doc: Fix typo "is is" in Documentations treewide: Fix printks with 0x%# zram: doc fixes Documentation/kmemcheck: update kmemcheck documentation doc: documentation/hwspinlock.txt fix typo PM / Hibernate: add section for resume options doc: filesystems : Fix typo in Documentations/filesystems scsi/megaraid fixed several typos in comments ppc: init_32: Fix error typo "CONFIG_START_KERNEL" treewide: Add __GFP_NOWARN to k.alloc calls with v.alloc fallbacks page_isolation: Fix a comment typo in test_pages_isolated() doc: fix a typo about irq affinity ...
| * treewide: Fix printks with 0x%#Joe Perches2013-08-271-1/+1
| | | | | | | | | | | | | | | | Using 0x%# emits 0x0x. Only one is necessary. Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | parisc: Fix interrupt routing for C8000 serial portsThomas Bogendoerfer2013-07-311-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We can't use dev->mod_index for selecting the interrupt routing entry, because it's not an index into interrupt routing table. It will be even wrong on a machine with 2 CPUs (4 cores). But all needed information is contained in the PAT entries for the serial ports. mod[0] contains the iosapic address and mod_info has some indications for the interrupt input (at least it looks like it). This patch implements the searching for the right iosapic and uses this interrupt input information. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: <stable@vger.kernel.org> # 3.10 Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: Remove arch/parisc/kernel/sys32.h headerJohn David Anglin2013-07-314-46/+0
| | | | | | | | | | | | | | | | The KERNEL_SYSCALL define is not used anymore so the header can be removed. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: Fix cache routines to ignore vma's with an invalid pfnJohn David Anglin2013-07-311-64/+71
|/ | | | | | | | | | | | | | | | | | | | | | | | | The parisc architecture does not have a pte special bit. As a result, special mappings are handled with the VM_PFNMAP and VM_MIXEDMAP flags. VM_MIXEDMAP mappings may or may not have a "struct page" backing. When pfn_valid() is false, there is no "struct page" backing. Otherwise, they are treated as normal pages. The FireGL driver uses the VM_MIXEDMAP without a backing "struct page". This treatment caused a panic due to a TLB data miss in update_mmu_cache. This appeared to be in the code generated for page_address(). We were in fact using a very circular bit of code to determine the physical address of the PFN in various cache routines. This wasn't valid when there was no "struct page" backing. The needed address can in fact be determined simply from the PFN itself without using the "struct page". The attached patch updates update_mmu_cache(), flush_cache_mm(), flush_cache_range() and flush_cache_page() to check pfn_valid() and to directly compute the PFN physical and virtual addresses. Signed-off-by: John David Anglin <dave.anglin@bell.net> Cc: <stable@vger.kernel.org> # 3.10 Signed-off-by: Helge Deller <deller@gmx.de>
* parisc: delete __cpuinit usage from all usersPaul Gortmaker2013-07-154-14/+16
| | | | | | | | | | | | | | | | | | | | | | The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. This removes all the parisc uses of the __cpuinit macros. [1] https://lkml.org/lkml/2013/5/20/589 Acked-by: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: linux-parisc@vger.kernel.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
* parisc: Ensure volatile space register %sr1 is not clobberedJohn David Anglin2013-07-091-1/+1
| | | | | | | | | | | | | | | | | | | | I still see the occasional random segv on rp3440. Looking at one of these (a code 15), it appeared the problem must be with the cache handling of anonymous pages. Reviewing this, I noticed that the space register %sr1 might be being clobbered when we flush an anonymous page. Register %sr1 is used for TLB purges in a couple of places. These purges are needed on PA8800 and PA8900 processors to ensure cache consistency of flushed cache lines. The solution here is simply to move the %sr1 load into the TLB lock region needed to ensure that one purge executes at a time on SMP systems. This was already the case for one use. After a few days of operation, I haven't had a random segv on my rp3440. Signed-off-by: John David Anglin <dave.anglin@bell.net> Cc: <stable@vger.kernel.org> # 3.10 Signed-off-by: Helge Deller <deller@gmx.de>
* parisc: more capabilities info in /proc/cpuinfoHelge Deller2013-07-091-3/+16
| | | | | Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # 3.10
* Merge 3.10-rc7 into tty-nextGreg Kroah-Hartman2013-06-253-38/+66
|\ | | | | | | | | | | We want the tty fixes in this branch as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * parisc: Use unshadowed index register for flush instructions in ↵John David Anglin2013-06-181-38/+38
| | | | | | | | | | | | | | | | | | | | | | | | flush_dcache_page_asm and flush_icache_page_asm The comment at the start of pacache.S states that the base and index registers used for fdc,fic, and pdc instructions should not use shadowed registers. Although this is probably unnecessary for tmpalias flushes, there is also no reason not to comply. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: provide pci_mmap_page_range() for pariscThomas Bogendoerfer2013-06-181-0/+27
| | | | | | | | | | | | | | | | pci_mmap_page_range() is needed for X11-server support on C8000 with ATI FireGL card. Signed-off-by Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: fix serial ports on C8000 workstationThomas Bogendoerfer2013-06-181-0/+1
| | | | | | | | | | | | | | | | | | | | The C8000 workstation (64 bit kernel only) has a somewhat different serial port configuration than other models. Thomas Bogendoerfer sent a patch to fix this in September 2010, which was now minimally modified by me. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Helge Deller <deller@gmx.de>
* | Merge 3.10-rc5 into tty-nextGreg Kroah-Hartman2013-06-092-2/+3
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| * parisc: kernel: using strlcpy() instead of strcpy()Chen Gang2013-06-011-1/+2
| | | | | | | | | | | | | | | | | | 'boot_args' is an input args, and 'boot_command_line' has a fix length. So use strlcpy() instead of strcpy() to avoid memory overflow. Signed-off-by: Chen Gang <gang.chen@asianux.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: memory overflow, 'name' length is too short for usingChen Gang2013-06-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'path.bc[i]' can be asigned by PCI_SLOT() which can '> 10', so sizeof(6 * "%u:" + "%u" + '\0') may be 21. Since 'name' length is 20, it may be memory overflow. And 'path.bc[i]' is 'unsigned char' for printing, we can be sure the max length of 'name' must be less than 28. So simplify thinking, we can use 28 instead of 20 directly, and do not think of whether 'patchc.bc[i]' can '> 100'. Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Helge Deller <deller@gmx.de>
* | Merge 3.10-rc3 into tty-nextGreg Kroah-Hartman2013-05-276-102/+211
|\| | | | | | | | | | | We want these fixes. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * parisc: fix irq stack on UP and SMPHelge Deller2013-05-241-15/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The logic to detect if the irq stack was already in use with raw_spin_trylock() is wrong, because it will generate a "trylock failure on UP" error message with CONFIG_SMP=n and CONFIG_DEBUG_SPINLOCK=y. arch_spin_trylock() can't be used either since in the CONFIG_SMP=n case no atomic protection is given and we are reentrant here. A mutex didn't worked either and brings more overhead by turning off interrupts. So, let's use the fastest path for parisc which is the ldcw instruction. Counting how often the irq stack was used is pretty useless, so just drop this piece of code. Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: make interrupt and interruption stack allocation reentrantJohn David Anglin2013-05-241-9/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The get_stack_use_cr30 and get_stack_use_r30 macros allocate a stack frame for external interrupts and interruptions requiring a stack frame. They are currently not reentrant in that they save register context before the stack is set or adjusted. I have observed a number of system crashes where there was clear evidence of stack corruption during interrupt processing, and as a result register corruption. Some interruptions can still occur during interruption processing, however external interrupts are disabled and data TLB misses don't occur for absolute accesses. So, it's not entirely clear what triggers this issue. Also, if an interruption occurs when Q=0, it is generally not possible to recover as the shadowed registers are not copied. The attached patch reworks the get_stack_use_cr30 and get_stack_use_r30 macros to allocate stack before doing register saves. The new code is a couple of instructions shorter than the old implementation. Thus, it's an improvement even if it doesn't fully resolve the stack corruption issue. Based on limited testing, it improves SMP system stability. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: show number of FPE and unaligned access handler calls in ↵Helge Deller2013-05-243-0/+12
| | | | | | | | | | | | | | | | | | /proc/interrupts Show number of floating point assistant and unaligned access fixup handler in /proc/interrupts file. Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: use PAGE_SHIFT instead of hardcoded value 12 in pacache.SHelge Deller2013-05-241-6/+6
| | | | | | | | | | | | additionally clean up some whitespaces & tabs. Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: add rp5470 entry to machine databaseHelge Deller2013-05-241-0/+1
| | | | | | | | Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: fix SMP races when updating PTE and TLB entries in entry.SJohn David Anglin2013-05-111-72/+83
| | | | | | | | | | | | | | | | | | | | | | | | | | Currently, race conditions exist in the handling of TLB interruptions in entry.S. In particular, dirty bit updates can be lost if an accessed interruption occurs just after the dirty bit interruption on a different cpu. Lost dirty bit updates result in user pages not being flushed and general system instability. This change adds lock and unlock macros to synchronize all PTE and TLB updates done in entry.S. As a result, userspace stability is significantly improved. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
| * parisc: implement irq stacks - part 2 (v2)Helge Deller2013-05-111-14/+87
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes few build issues which were introduced with the last irq stack patch, e.g. the combination of stack overflow check and irq stack. Furthermore we now do proper locking and change the irq bh handler to use the irq stack as well. In /proc/interrupts one now can monitor how huge the irq stack has grown and how often it was preferred over the kernel stack. IRQ stacks are now enabled by default just to make sure that we not overflow the kernel stack by accident. Signed-off-by: Helge Deller <deller@gmx.de>
* | TTY:vt: convert remain take_over_console's users to do_take_over_consoleWang YanQing2013-05-211-1/+1
|/ | | | | | | | | | | | | | | Impact: 1:convert all remain take_over_console to do_take_over_console 2:update take_over_console to do_take_over_console in comment Commit dc9641895abb ("vt: delete unneeded functions register_con_driver|take_over_console") delete take_over_console, but forget to convert remain take_over_console's users to new API do_take_over_console, this patch fix it. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Wang YanQing <udknight@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2013-05-101-8/+0
|\ | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal Pull stray syscall bits from Al Viro: "Several syscall-related commits that were missing from the original" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: switch compat_sys_sysctl to COMPAT_SYSCALL_DEFINE unicore32: just use mmap_pgoff()... unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE x86, vm86: fix VM86 syscalls: use SYSCALL_DEFINEx(...)
| * unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINEAl Viro2013-05-091-8/+0
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | parisc: tlb flush counting fix for SMP and UPHelge Deller2013-05-072-14/+2
| | | | | | | | | | | | | | Fix up build error on UP and show correctly number of function call (ipi) irqs. Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: more irq statistics in /proc/interruptsHelge Deller2013-05-072-2/+49
| | | | | | | | | | | | | | Add framework and initial values for more fine grained statistics in /proc/interrupts. Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: implement irq stacksHelge Deller2013-05-072-0/+69
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Default kernel stack size on parisc is 16k. During tests we found that the kernel stack can easily grow beyond 13k, which leaves 3k left for irq processing. This patch adds the possibility to activate an additional stack of 16k per CPU which is being used during irq processing. This implementation does not yet uses this irq stack for the irq bh handler. The assembler code for call_on_stack was heavily cleaned up by John David Anglin. CC: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: add kernel stack overflow checkHelge Deller2013-05-072-3/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the CONFIG_DEBUG_STACKOVERFLOW config option to enable checks to detect kernel stack overflows. Stack overflows can not be detected reliable since we do not want to introduce too much overhead. Instead, during irq processing in do_cpu_irq_mask() we check kernel stack usage of the interrupted kernel process. Kernel threads can be easily detected by checking the value of space register 7 (sr7) which is zero when running inside the kernel. Since THREAD_SIZE is 16k and PAGE_SIZE is 4k, reduce the alignment of the init thread to the lower value (PAGE_SIZE) in the kernel vmlinux.ld.S linker script. Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: only re-enable interrupts if we need to schedule or deliver signals ↵John David Anglin2013-05-071-5/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | when returning to userspace Helge and I have found that we have a kernel stack overflow problem which causes a variety of random failures. Currently, we re-enable interrupts when returning from an external interrupt incase we need to schedule or delivery signals. As a result, a potentially unlimited number of interrupts can occur while we are running on the kernel stack. It is very limited in space (currently, 16k). This change defers enabling interrupts until we have actually decided to schedule or delivery signals. This only occurs when we about to return to userspace. This limits the number of interrupts on the kernel stack to one. In other cases, interrupts remain disabled until the final return from interrupt (rfi). Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: use long branch in fork_like macroJohn David Anglin2013-05-061-1/+2
| | | | | | | | | | | | | | | | | | | | | | The "b" branch instruction used in the fork_like macro only can handle 17-bit pc-relative offsets. This fails with an out of range offset with some .config files. Rewrite to use the "be" instruction which can branch to any address in a space. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: document the parisc gateway pageHelge Deller2013-05-061-1/+24
| | | | | | | | | | | | | | | | | | | | | | | | Include some documentation about how the parisc gateway page technically works and how it is used from userspace. James Bottomley is the original author of this description and it was copied here out of an email thread from Apr 12 2013 titled: man2 : syscall.2 : document syscall calling conventions CC: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: fix partly 16/64k PAGE_SIZE bootHelge Deller2013-05-065-21/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes partly PAGE_SIZEs of 16K or 64K by adjusting the assembler PTE lookup code and the assembler TEMPALIAS code. Furthermore some data alignments for PAGE_SIZE have been limited to 4K (or less) to not waste too much memory with greater page sizes. As a side note, the palo loader can (currently) only handle up to 10 ELF segments which is fixed with tighter aligning as well. My testings indicated that the ldci command in the sba iommu coding needed adjustment by the PAGE_SHIFT value and that the I/O PDIR Page size was only set to 4K for my machine (C3000). All this fixes partly the boot, but there are still quite some caching problems left. Examples are e.g. the symbios logic driver which is failing: sym0: <896> rev 0x7 at pci 0000:00:0f.0 irq 69 sym0: PA-RISC Firmware, ID 7, Fast-40, SE, parity checking CACHE TEST FAILED: DMA error (dstat=0x81).sym0: CACHE INCORRECTLY CONFIGURED. and the tulip network driver which doesn't seem to work correctly either: Sending BOOTP requests .net eth0: Setting full-duplex based on MII#1 link partner capability of 05e1 ..... timed out! Beside those kernel fixes glibc will need fixes too to be able to handle >4K page sizes. Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: fix whitespace errors in arch/parisc/kernel/traps.cRolf Eike Beer2013-05-061-12/+12
| | | | | | | | | | | | | | | | Things like " \t" and whitespace at end of line. I'm leaving all the other coding style errors here alone. Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de> Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: remove the second argument of kmap_atomicZhao Hongjiang2013-05-061-3/+3
| | | | | | | | | | | | | | kmap_atomic allows only one argument now, just move the second. Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com> Signed-off-by: Helge Deller <deller@gmx.de>
* | parisc: single_open() leaksAl Viro2013-05-051-1/+1
|/ | | | | Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'for-linus' of ↵Linus Torvalds2013-05-021-23/+24
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull VFS updates from Al Viro, Misc cleanups all over the place, mainly wrt /proc interfaces (switch create_proc_entry to proc_create(), get rid of the deprecated create_proc_read_entry() in favor of using proc_create_data() and seq_file etc). 7kloc removed. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (204 commits) don't bother with deferred freeing of fdtables proc: Move non-public stuff from linux/proc_fs.h to fs/proc/internal.h proc: Make the PROC_I() and PDE() macros internal to procfs proc: Supply a function to remove a proc entry by PDE take cgroup_open() and cpuset_open() to fs/proc/base.c ppc: Clean up scanlog ppc: Clean up rtas_flash driver somewhat hostap: proc: Use remove_proc_subtree() drm: proc: Use remove_proc_subtree() drm: proc: Use minor->index to label things, not PDE->name drm: Constify drm_proc_list[] zoran: Don't print proc_dir_entry data in debug reiserfs: Don't access the proc_dir_entry in r_open(), r_start() r_show() proc: Supply an accessor for getting the data from a PDE's parent airo: Use remove_proc_subtree() rtl8192u: Don't need to save device proc dir PDE rtl8187se: Use a dir under /proc/net/r8180/ proc: Add proc_mkdir_data() proc: Move some bits from linux/proc_fs.h to linux/{of.h,signal.h,tty.h} proc: Move PDE_NET() to fs/proc/proc_net.c ...
| * parisc: Don't use create_proc_read_entry()David Howells2013-04-291-23/+24
| | | | | | | | | | | | | | | | | | | | | | Don't use create_proc_read_entry() as that is deprecated, but rather use proc_create_data() and seq_file instead. Signed-off-by: David Howells <dhowells@redhat.com> cc: "James E.J. Bottomley" <jejb@parisc-linux.org> cc: Helge Deller <deller@gmx.de> cc: linux-parisc@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge branch 'for-linus' of ↵Linus Torvalds2013-05-012-45/+4
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal Pull compat cleanup from Al Viro: "Mostly about syscall wrappers this time; there will be another pile with patches in the same general area from various people, but I'd rather push those after both that and vfs.git pile are in." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: syscalls.h: slightly reduce the jungles of macros get rid of union semop in sys_semctl(2) arguments make do_mremap() static sparc: no need to sign-extend in sync_file_range() wrapper ppc compat wrappers for add_key(2) and request_key(2) are pointless x86: trim sys_ia32.h x86: sys32_kill and sys32_mprotect are pointless get rid of compat_sys_semctl() and friends in case of ARCH_WANT_OLD_COMPAT_IPC merge compat sys_ipc instances consolidate compat lookup_dcookie() convert vmsplice to COMPAT_SYSCALL_DEFINE switch getrusage() to COMPAT_SYSCALL_DEFINE switch epoll_pwait to COMPAT_SYSCALL_DEFINE convert sendfile{,64} to COMPAT_SYSCALL_DEFINE switch signalfd{,4}() to COMPAT_SYSCALL_DEFINE make SYSCALL_DEFINE<n>-generated wrappers do asmlinkage_protect make HAVE_SYSCALL_WRAPPERS unconditional consolidate cond_syscall and SYSCALL_ALIAS declarations teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long get rid of duplicate logics in __SC_....[1-6] definitions
| * | get rid of union semop in sys_semctl(2) argumentsAl Viro2013-03-052-16/+1
| | | | | | | | | | | | | | | | | | | | | just have the bugger take unsigned long and deal with SETVAL case (when we use an int member in the union) explicitly. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | consolidate compat lookup_dcookie()Al Viro2013-03-042-8/+1
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | convert sendfile{,64} to COMPAT_SYSCALL_DEFINEAl Viro2013-03-042-21/+2
| |/ | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | dump_stack: unify debug information printed by show_regs()Tejun Heo2013-05-011-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | show_regs() is inherently arch-dependent but it does make sense to print generic debug information and some archs already do albeit in slightly different forms. This patch introduces a generic function to print debug information from show_regs() so that different archs print out the same information and it's much easier to modify what's printed. show_regs_print_info() prints out the same debug info as dump_stack() does plus task and thread_info pointers. * Archs which didn't print debug info now do. alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r, metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc, um, xtensa * Already prints debug info. Replaced with show_regs_print_info(). The printed information is superset of what used to be there. arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86 * s390 is special in that it used to print arch-specific information along with generic debug info. Heiko and Martin think that the arch-specific extra isn't worth keeping s390 specfic implementation. Converted to use the generic version. Note that now all archs print the debug info before actual register dumps. An example BUG() dump follows. kernel BUG at /work/os/work/kernel/workqueue.c:4841! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #7 Hardware name: empty empty/S3992, BIOS 080011 10/26/2007 task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000 RIP: 0010:[<ffffffff8234a07e>] [<ffffffff8234a07e>] init_workqueues+0x4/0x6 RSP: 0000:ffff88007c861ec8 EFLAGS: 00010246 RAX: ffff88007c861fd8 RBX: ffffffff824466a8 RCX: 0000000000000001 RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffffffff8234a07a RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a07a R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Stack: ffff88007c861ef8 ffffffff81000312 ffffffff824466a8 ffff88007c85e650 0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47760 Call Trace: [<ffffffff81000312>] do_one_initcall+0x122/0x170 [<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8 [<ffffffff81c47760>] ? rest_init+0x140/0x140 [<ffffffff81c4776e>] kernel_init+0xe/0xf0 [<ffffffff81c6be9c>] ret_from_fork+0x7c/0xb0 [<ffffffff81c47760>] ? rest_init+0x140/0x140 ... v2: Typo fix in x86-32. v3: CPU number dropped from show_regs_print_info() as dump_stack_print_info() has been updated to print it. s390 specific implementation dropped as requested by s390 maintainers. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [tile bits] Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | dump_stack: consolidate dump_stack() implementations and unify their behaviorsTejun Heo2013-05-011-8/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Both dump_stack() and show_stack() are currently implemented by each architecture. show_stack(NULL, NULL) dumps the backtrace for the current task as does dump_stack(). On some archs, dump_stack() prints extra information - pid, utsname and so on - in addition to the backtrace while the two are identical on other archs. The usages in arch-independent code of the two functions indicate show_stack(NULL, NULL) should print out bare backtrace while dump_stack() is used for debugging purposes when something went wrong, so it does make sense to print additional information on the task which triggered dump_stack(). There's no reason to require archs to implement two separate but mostly identical functions. It leads to unnecessary subtle information. This patch expands the dummy fallback dump_stack() implementation in lib/dump_stack.c such that it prints out debug information (taken from x86) and invokes show_stack(NULL, NULL) and drops arch-specific dump_stack() implementations in all archs except blackfin. Blackfin's dump_stack() does something wonky that I don't understand. Debug information can be printed separately by calling dump_stack_print_info() so that arch-specific dump_stack() implementation can still emit the same debug information. This is used in blackfin. This patch brings the following behavior changes. * On some archs, an extra level in backtrace for show_stack() could be printed. This is because the top frame was determined in dump_stack() on those archs while generic dump_stack() can't do that reliably. It can be compensated by inlining dump_stack() but not sure whether that'd be necessary. * Most archs didn't use to print debug info on dump_stack(). They do now. An example WARN dump follows. WARNING: at kernel/workqueue.c:4841 init_workqueues+0x35/0x505() Hardware name: empty Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #9 0000000000000009 ffff88007c861e08 ffffffff81c614dc ffff88007c861e48 ffffffff8108f50f ffffffff82228240 0000000000000040 ffffffff8234a03c 0000000000000000 0000000000000000 0000000000000000 ffff88007c861e58 Call Trace: [<ffffffff81c614dc>] dump_stack+0x19/0x1b [<ffffffff8108f50f>] warn_slowpath_common+0x7f/0xc0 [<ffffffff8108f56a>] warn_slowpath_null+0x1a/0x20 [<ffffffff8234a071>] init_workqueues+0x35/0x505 ... v2: CPU number added to the generic debug info as requested by s390 folks and dropped the s390 specific dump_stack(). This loses %ksp from the debug message which the maintainers think isn't important enough to keep the s390-specific dump_stack() implementation. dump_stack_print_info() is moved to kernel/printk.c from lib/dump_stack.c. Because linkage is per objecct file, dump_stack_print_info() living in the same lib file as generic dump_stack() means that archs which implement custom dump_stack() - at this point, only blackfin - can't use dump_stack_print_info() as that will bring in the generic version of dump_stack() too. v1 The v1 patch broke build on blackfin due to this issue. The build breakage was reported by Fengguang Wu. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [s390 bits] Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge branch 'smp-hotplug-for-linus' of ↵Linus Torvalds2013-04-302-23/+1
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull SMP/hotplug changes from Ingo Molnar: "This is a pretty large, multi-arch series unifying and generalizing the various disjunct pieces of idle routines that architectures have historically copied from each other and have grown in random, wildly inconsistent and sometimes buggy directions: 101 files changed, 455 insertions(+), 1328 deletions(-) this went through a number of review and test iterations before it was committed, it was tested on various architectures, was exposed to linux-next for quite some time - nevertheless it might cause problems on architectures that don't read the mailing lists and don't regularly test linux-next. This cat herding excercise was motivated by the -rt kernel, and was brought to you by Thomas "the Whip" Gleixner." * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits) idle: Remove GENERIC_IDLE_LOOP config switch um: Use generic idle loop ia64: Make sure interrupts enabled when we "safe_halt()" sparc: Use generic idle loop idle: Remove unused ARCH_HAS_DEFAULT_IDLE bfin: Fix typo in arch_cpu_idle() xtensa: Use generic idle loop x86: Use generic idle loop unicore: Use generic idle loop tile: Use generic idle loop tile: Enter idle with preemption disabled sh: Use generic idle loop score: Use generic idle loop s390: Use generic idle loop powerpc: Use generic idle loop parisc: Use generic idle loop openrisc: Use generic idle loop mn10300: Use generic idle loop mips: Use generic idle loop microblaze: Use generic idle loop ...
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