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* panic: fix a possible deadlock in panic()Vikram Mulukutla2012-07-311-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | panic_lock is meant to ensure that panic processing takes place only on one cpu; if any of the other cpus encounter a panic, they will spin waiting to be shut down. However, this causes a regression in this scenario: 1. Cpu 0 encounters a panic and acquires the panic_lock and proceeds with the panic processing. 2. There is an interrupt on cpu 0 that also encounters an error condition and invokes panic. 3. This second invocation fails to acquire the panic_lock and enters the infinite while loop in panic_smp_self_stop. Thus all panic processing is stopped, and the cpu is stuck for eternity in the while(1) inside panic_smp_self_stop. To address this, disable local interrupts with local_irq_disable before acquiring the panic_lock. This will prevent interrupt handlers from executing during the panic processing, thus avoiding this particular problem. Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kdump: Execute kmsg_dump(KMSG_DUMP_PANIC) after smp_send_stop()Seiji Aguchi2012-05-181-2/+2
| | | | | | | | | | | | | | | This patch moves kmsg_dump(KMSG_DUMP_PANIC) below smp_send_stop(), to serialize the crash-logging process via smp_send_stop() and to thus retrieve a more stable crash image of all CPUs stopped. Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Acked-by: Don Zickus <dzickus@redhat.com> Cc: dle-develop@lists.sourceforge.net <dle-develop@lists.sourceforge.net> Cc: Satoru Moriya <satoru.moriya@hds.com> Cc: Tony Luck <tony.luck@intel.com> Cc: a.p.zijlstra@chello.nl <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/5C4C569E8A4B9B42A84A977CF070A35B2E4D7A5CE2@USINDEVS01.corp.hds.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* panic: Make panic_on_oops configurableKyle McMartin2012-05-071-1/+1
| | | | | | | | | | | | | | Several distros set this by default by patching panic_on_oops. It seems to fit with the BOOTPARAM_{HARD,SOFT}_PANIC options though, so let's add a Kconfig entry and reduce some more upstream delta. Signed-off-by: Kyle McMartin <kyle@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20120411121529.GH26688@redacted.bos.redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* panic: fix stack dump print on direct call to panic()Jason Wessel2012-04-121-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 6e6f0a1f0fa6 ("panic: don't print redundant backtraces on oops") causes a regression where no stack trace will be printed at all for the case where kernel code calls panic() directly while not processing an oops, and of course there are 100's of instances of this type of call. The original commit executed the check (!oops_in_progress), but this will always be false because just before the dump_stack() there is a call to bust_spinlocks(1), which does the following: void __attribute__((weak)) bust_spinlocks(int yes) { if (yes) { ++oops_in_progress; The proper way to resolve the problem that original commit tried to solve is to avoid printing a stack dump from panic() when the either of the following conditions is true: 1) TAINT_DIE has been set (this is done by oops_end()) This indicates and oops has already been printed. 2) oops_in_progress > 1 This guards against the rare case where panic() is invoked a second time, or in between oops_begin() and oops_end() Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: <stable@vger.kernel.org> [3.3+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* panic: don't print redundant backtraces on oopsAndi Kleen2012-01-131-1/+5
| | | | | | | | | | | | | | | When an oops causes a panic and panic prints another backtrace it's pretty common to have the original oops data be scrolled away on a 80x50 screen. The second backtrace is quite redundant and not needed anyways. So don't print the panic backtrace when oops_in_progress is true. [akpm@linux-foundation.org: add comment] Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kdump: fix crash_kexec()/smp_send_stop() race in panic()Michael Holzheu2012-01-131-1/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | When two CPUs call panic at the same time there is a possible race condition that can stop kdump. The first CPU calls crash_kexec() and the second CPU calls smp_send_stop() in panic() before crash_kexec() finished on the first CPU. So the second CPU stops the first CPU and therefore kdump fails: 1st CPU: panic()->crash_kexec()->mutex_trylock(&kexec_mutex)-> do kdump 2nd CPU: panic()->crash_kexec()->kexec_mutex already held by 1st CPU ->smp_send_stop()-> stop 1st CPU (stop kdump) This patch fixes the problem by introducing a spinlock in panic that allows only one CPU to process crash_kexec() and the subsequent panic code. All other CPUs call the weak function panic_smp_self_stop() that stops the CPU itself. This function can be overloaded by architecture code. For example "tile" can use their lower-power "nap" instruction for that. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* treewide: remove useless NORET_TYPE macro and usesJoe Perches2012-01-131-1/+1
| | | | | | | | | | | | | | | | | | | | | | | It's a very old and now unused prototype marking so just delete it. Neaten panic pointer argument style to keep checkpatch quiet. Signed-off-by: Joe Perches <joe@perches.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* lockdep, bug: Exclude TAINT_OOT_MODULE from disabling lock debuggingBen Hutchings2011-12-071-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | We do want to allow lock debugging for GPL-compatible modules that are not (yet) built in-tree. This was disabled as a side-effect of commit 2449b8ba0745327c5fa49a8d9acffe03b2eded69 ('module,bug: Add TAINT_OOT_MODULE flag for modules not built in-tree'). Lock debug warnings now include taint flags, so kernel developers should still be able to deflect warnings caused by out-of-tree modules. The TAINT_PROPRIETARY_MODULE flag for non-GPL-compatible modules will still disable lock debugging. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: Nick Bowler <nbowler@elliptictech.com> Cc: Greg KH <greg@kroah.com> Cc: Dave Jones <davej@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Debian kernel maintainers <debian-kernel@lists.debian.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Alan Cox <alan@linux.intel.com> Link: http://lkml.kernel.org/r/1323268258.18450.11.camel@deadeye Signed-off-by: Ingo Molnar <mingo@elte.hu>
* lockdep, bug: Exclude TAINT_FIRMWARE_WORKAROUND from disabling lockdepPeter Zijlstra2011-12-061-2/+10
| | | | | | | | | | | | | | | | | | | | It's unlikely that TAINT_FIRMWARE_WORKAROUND causes false lockdep messages, so do not disable lockdep in that case. We still want to keep lockdep disabled in the TAINT_OOT_MODULE case: - bin-only modules can cause various instabilities in their and in unrelated kernel code - they are impossible to debug for kernel developers - they also typically do not have the copyright license permission to link to the GPL-ed lockdep code. Suggested-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-xopopjjens57r0i13qnyh2yo@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
* module,bug: Add TAINT_OOT_MODULE flag for modules not built in-treeBen Hutchings2011-11-061-0/+2
| | | | | | | | | | | | Use of the GPL or a compatible licence doesn't necessarily make the code any good. We already consider staging modules to be suspect, and this should also be true for out-of-tree modules which may receive very little review. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Reviewed-by: Dave Jones <davej@redhat.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (patched oops-tracing.txt)
* panic: panic=-1 for immediate rebootHugh Dickins2011-07-271-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a kernel BUG or oops occurs, ChromeOS intends to panic and immediately reboot, with stacktrace and other messages preserved in RAM across reboot. But the longer we delay, the more likely the user is to poweroff and lose the info. panic_timeout (seconds before rebooting) is set by panic= boot option or sysctl or /proc/sys/kernel/panic; but 0 means wait forever, so at present we have to delay at least 1 second. Let a negative number mean reboot immediately (with the small cosmetic benefit of suppressing that newline-less "Rebooting in %d seconds.." message). Signed-off-by: Hugh Dickins <hughd@chromium.org> Signed-off-by: Mandeep Singh Baines <msb@chromium.org> Cc: Huang Ying <ying.huang@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Olaf Hering <olaf@aepfle.de> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: Dave Airlie <airlied@gmail.com> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* move x86 specific oops=panic to generic codeOlaf Hering2011-03-231-0/+10
| | | | | | | | | | | | The oops=panic cmdline option is not x86 specific, move it to generic code. Update documentation. Signed-off-by: Olaf Hering <olaf@aepfle.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type supportHuang Ying2011-01-121-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Generic Hardware Error Source provides a way to report platform hardware errors (such as that from chipset). It works in so called "Firmware First" mode, that is, hardware errors are reported to firmware firstly, then reported to Linux by firmware. This way, some non-standard hardware error registers or non-standard hardware link can be checked by firmware to produce more valuable hardware error information for Linux. This patch adds POLL/IRQ/NMI notification types support. Because the memory area used to transfer hardware error information from BIOS to Linux can be determined only in NMI, IRQ or timer handler, but general ioremap can not be used in atomic context, so a special version of atomic ioremap is implemented for that. Known issue: - Error information can not be printed for recoverable errors notified via NMI, because printk is not NMI-safe. Will fix this via delay printing to IRQ context via irq_work or make printk NMI-safe. v2: - adjust printk format per comments. Signed-off-by: Huang Ying <ying.huang@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
* lib/bug.c: add oops end marker to WARN implementationAnton Blanchard2010-08-111-1/+1
| | | | | | | | | | | | We are missing the oops end marker for the exception based WARN implementation in lib/bug.c. This is useful for logfile analysis tools. Signed-off-by: Anton Blanchard <anton@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Arjan van de Ven <arjan@infradead.org> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* panic: keep blinking in spite of long spin timer modeTAMUKI Shoichi2010-08-111-32/+26
| | | | | | | | | | | | | | | | | | | | | To keep panic_timeout accuracy when running under a hypervisor, the current implementation only spins on long time (1 second) calls to mdelay. That brings a good effect, but the problem is the keyboard LEDs don't blink at all on that situation. This patch changes to call to panic_blink_enter() between every mdelay and keeps blinking in spite of long spin timer mode. The time to call to mdelay is now 100ms. Even this change will keep panic_timeout accuracy enough when running under a hypervisor. Signed-off-by: TAMUKI Shoichi <tamuki@linet.gr.jp> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Russell King <linux@arm.linux.org.uk> Acked-by: Dmitry Torokhov <dtor@mail.ru> Cc: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* panic: call console_verbose() in panicAnton Blanchard2010-05-271-0/+1
| | | | | | | | | | | | | | | | | Most distros turn the console verbosity down and that means a backtrace after a panic never makes it to the console. I assume we haven't seen this because a panic is often preceeded by an oops which will have called console_verbose. There are however a lot of places we call panic directly, and they are broken. Use console_verbose like we do in the oops path to ensure a directly called panic will print a backtrace. Signed-off-by: Anton Blanchard <anton@samba.org> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* panic: Add taint flag TAINT_FIRMWARE_WORKAROUND ('I')Ben Hutchings2010-05-191-0/+2
| | | | | | | | This taint flag will initially be used when warning about invalid ACPI DMAR tables. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* panic: Allow warnings to set different taint flagsBen Hutchings2010-05-191-4/+20
| | | | | | | | | | | | | | | | | WARN() is used in some places to report firmware or hardware bugs that are then worked-around. These bugs do not affect the stability of the kernel and should not set the flag for TAINT_WARN. To allow for this, add WARN_TAINT() and WARN_TAINT_ONCE() macros that take a taint number as argument. Architectures that implement warnings using trap instructions instead of calls to warn_slowpath_*() now implement __WARN_TAINT(taint) instead of __WARN(). Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Acked-by: Helge Deller <deller@gmx.de> Tested-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* panic: fix panic_timeout accuracy when running on a hypervisorAnton Blanchard2010-03-061-16/+30
| | | | | | | | | | | | | | | | | | I've had some complaints about panic_timeout being wildly innacurate on shared processor PowerPC partitions (a 3 minute panic_timeout taking 30 minutes). The problem is we loop on mdelay(1) and with a 1ms in 10ms hypervisor timeslice each of these will take 10ms (ie 10x) longer. I expect other platforms with shared processor hypervisors will see the same issue. This patch keeps the old behaviour if we have a panic_blink (only keyboard LEDs right now) and does 1 second mdelays if we don't. Signed-off-by: Anton Blanchard <anton@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kmsg_dump: Dump on crash_kexec as wellKOSAKI Motohiro2009-12-311-1/+2
| | | | | | | | | | | | | | | | crash_kexec gets called before kmsg_dump(KMSG_DUMP_OOPS) if panic_on_oops is set, so the kernel log buffer is not stored for this case. This patch adds a KMSG_DUMP_KEXEC dump type which gets called when crash_kexec() is invoked. To avoid getting double dumps, the old KMSG_DUMP_PANIC is moved below crash_kexec(). The mtdoops driver is modified to handle KMSG_DUMP_KEXEC in the same way as a panic. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Simon Kagstrom <simon.kagstrom@netinsight.net> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* Merge git://git.infradead.org/mtd-2.6Linus Torvalds2009-12-161-0/+3
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.infradead.org/mtd-2.6: (90 commits) jffs2: Fix long-standing bug with symlink garbage collection. mtd: OneNAND: Fix test of unsigned in onenand_otp_walk() mtd: cfi_cmdset_0002, fix lock imbalance Revert "mtd: move mxcnd_remove to .exit.text" mtd: m25p80: add support for Macronix MX25L4005A kmsg_dump: fix build for CONFIG_PRINTK=n mtd: nandsim: add support for 4KiB pages mtd: mtdoops: refactor as a kmsg_dumper mtd: mtdoops: make record size configurable mtd: mtdoops: limit the maximum mtd partition size mtd: mtdoops: keep track of used/unused pages in an array mtd: mtdoops: several minor cleanups core: Add kernel message dumper to call on oopses and panics mtd: add ARM pismo support mtd: pxa3xx_nand: Fix PIO data transfer mtd: nand: fix multi-chip suspend problem mtd: add support for switching old SST chips into QRY mode mtd: fix M29W800D dev_id and uaddr mtd: don't use PF_MEMALLOC mtd: Add bad block table overrides to Davinci NAND driver ... Fixed up conflicts (mostly trivial) in drivers/mtd/devices/m25p80.c drivers/mtd/maps/pcmciamtd.c drivers/mtd/nand/pxa3xx_nand.c kernel/printk.c
| * core: Add kernel message dumper to call on oopses and panicsSimon Kagstrom2009-11-301-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The core functionality is implemented as per Linus suggestion from http://lists.infradead.org/pipermail/linux-mtd/2009-October/027620.html (with the kmsg_dump implementation by Linus). A struct kmsg_dumper has been added which contains a callback to dump the kernel log buffers on crashes. The kmsg_dump function gets called from oops_exit() and panic() and invokes this callbacks with the crash reason. [dwmw2: Fix log_end handling] Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net> Reviewed-by: Anders Grafstrom <anders.grafstrom@netinsight.net> Reviewed-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* | Merge branch 'core-fixes-for-linus' of ↵Linus Torvalds2009-10-081-1/+2
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: futex: fix requeue_pi key imbalance futex: Fix typo in FUTEX_WAIT/WAKE_BITSET_PRIVATE definitions rcu: Place root rcu_node structure in separate lockdep class rcu: Make hot-unplugged CPU relinquish its own RCU callbacks rcu: Move rcu_barrier() to rcutree futex: Move exit_pi_state() call to release_mm() futex: Nullify robust lists after cleanup futex: Fix locking imbalance panic: Fix panic message visibility by calling bust_spinlocks(0) before dying rcu: Replace the rcu_barrier enum with pointer to call_rcu*() function rcu: Clean up code based on review feedback from Josh Triplett, part 4 rcu: Clean up code based on review feedback from Josh Triplett, part 3 rcu: Fix rcu_lock_map build failure on CONFIG_PROVE_LOCKING=y rcu: Clean up code to address Ingo's checkpatch feedback rcu: Clean up code based on review feedback from Josh Triplett, part 2 rcu: Clean up code based on review feedback from Josh Triplett
| * panic: Fix panic message visibility by calling bust_spinlocks(0) before dyingAaro Koskinen2009-10-051-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit ffd71da4e3f ("panic: decrease oops_in_progress only after having done the panic") moved bust_spinlocks(0) to the end of the function, which in practice is never reached. As a result console_unblank() is not called, and on some systems the user may not see the panic message. Move it back up to before the unblanking. Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com> Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1254483680-25578-1-git-send-email-aaro.koskinen@nokia.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | trivial: Correct print_tainted routine name in commentRobert P. J. Day2009-09-211-1/+1
|/ | | | | Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* trace: stop tracer in oops_enter()Thomas Gleixner2009-07-241-0/+1
| | | | | | | | | If trace_printk_on_oops is set we lose interesting trace information when the tracer is enabled across oops handling and printing. We want the trace which might give us information _WHY_ we oopsed. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
* Fix caller information for warn_slowpath_nullLinus Torvalds2009-05-161-15/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Ian Campbell noticed that since "Eliminate thousands of warnings with gcc 3.2 build" (commit 57adc4d2dbf968fdbe516359688094eef4d46581) all WARN_ON()'s currently appear to come from warn_slowpath_null(), eg: WARNING: at kernel/softirq.c:143 warn_slowpath_null+0x1c/0x20() because now that warn_slowpath_null() is in the call path, the __builtin_return_address(0) returns that, rather than the place that caused the warning. Fix this by splitting up the warn_slowpath_null/fmt cases differently, using a common helper function, and getting the return address in the right place. This also happens to avoid the unnecessary stack usage for the non-stdargs case, and just generally cleans things up. Make the function name printout use %pS while at it. Cc: Ian Campbell <ian.campbell@citrix.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Eliminate thousands of warnings with gcc 3.2 buildAndi Kleen2009-05-071-3/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When building with gcc 3.2 I get thousands of warnings such as include/linux/gfp.h: In function `allocflags_to_migratetype': include/linux/gfp.h:105: warning: null format string due to passing a NULL format string to warn_slowpath() in #define __WARN() warn_slowpath(__FILE__, __LINE__, NULL) Split this case out into a separate call. This also shrinks the kernel slightly: text data bss dec hex filename 4802274 707668 712704 6222646 5ef336 vmlinux text data bss dec hex filename 4799027 703572 712704 6215303 5ed687 vmlinux due to removeing one argument from the commonly-called __WARN(). [akpm@linux-foundation.org: reduce scope of `empty'] Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* locking: clarify kernel-taint warning messageIngo Molnar2009-04-231-1/+1
| | | | | | | | | | | | | | | | Andi Kleen reported this message triggering on non-lockdep kernels: Disabling lockdep due to kernel taint Clarify the message to say 'lock debugging' - debug_locks_off() turns off all things lock debugging, not just lockdep. [ Impact: change kernel warning message text ] Reported-by: Andi Kleen <andi@firstfloor.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* lockdep: continue lock debugging despite some taintsFrederic Weisbecker2009-04-121-1/+3
| | | | | | | | | | | | | | | | | | | | Impact: broaden lockdep checks Lockdep is disabled after any kernel taints. This might be convenient to ignore bad locking issues which sources come from outside the kernel tree. Nevertheless, it might be a frustrating experience for the staging developers or those who experience a warning but are focused on another things that require lockdep. The v2 of this patch simply don't disable anymore lockdep in case of TAINT_CRAP and TAINT_WARN events. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: LTP <ltp-list@lists.sourceforge.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Greg KH <gregkh@suse.de> LKML-Reference: <1239412638-6739-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* lockdep: warn about lockdep disabling after kernel taintFrederic Weisbecker2009-04-121-2/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: provide useful missing info for developers Kernel taint can occur in several situations such as warnings, load of prorietary or staging modules, bad page, etc... But when such taint happens, a developer might still be working on the kernel, expecting that lockdep is still enabled. But a taint disables lockdep without ever warning about it. Such a kernel behaviour doesn't really help for kernel development. This patch adds this missing warning. Since the taint is done most of the time after the main message that explain the real source issue, it seems safe to warn about it inside add_taint() so that it appears at last, without hurting the main information. v2: Use a generic helper to disable lockdep instead of an open coded xchg(). Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <1239412638-6739-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* panic: clean up kernel/panic.cIngo Molnar2009-03-131-52/+59
| | | | | | | | | Impact: cleanup, no code changed Clean up kernel/panic.c some more and make it more consistent. LKML-Reference: <49B91A7E.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* panic, smp: provide smp_send_stop() wrapper on UP tooIngo Molnar2009-03-131-2/+0
| | | | | | | | | | Impact: cleanup, no code changed Remove an ugly #ifdef CONFIG_SMP from panic(), by providing an smp_send_stop() wrapper on UP too. LKML-Reference: <49B91A7E.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* panic: decrease oops_in_progress only after having done the panicIngo Molnar2009-03-131-1/+1
| | | | | | | | | | | | | | | | | | | | | Impact: eliminate secondary warnings during panic() We can panic() in a number of difficult, atomic contexts, hence we use bust_spinlocks(1) in panic() to increase oops_in_progress, which prevents various debug checks we have in place. But in practice this protection only covers the first few printk's done by panic() - it does not cover the later attempt to stop all other CPUs and kexec(). If a secondary warning triggers in one of those facilities that can make the panic message scroll off. So do bust_spinlocks(0) only much later in panic(). (which code is only reached if panic policy is relaxed that it can return after a warning message) Reported-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <49B91A7E.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* stackprotector: update make rulesTejun Heo2009-02-101-4/+0
| | | | | | | | | | | | | | | | | | Impact: no default -fno-stack-protector if stackp is enabled, cleanup Stackprotector make rules had the following problems. * cc support test and warning are scattered across makefile and kernel/panic.c. * -fno-stack-protector was always added regardless of configuration. Update such that cc support test and warning are contained in makefile and -fno-stack-protector is added iff stackp is turned off. While at it, prepare for 32bit support. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge branch 'core/percpu' into stackprotectorIngo Molnar2009-01-181-0/+2
|\ | | | | | | | | | | | | | | | | | | Conflicts: arch/x86/include/asm/pda.h arch/x86/include/asm/system.h Also, moved include/asm-x86/stackprotector.h to arch/x86/include/asm. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * oops: increment the oops UUID every time we oopsArjan van de Ven2009-01-071-0/+2
| | | | | | | | | | | | | | | | | | ... because we do want repeated same-oops to be seen by automated tools like kerneloops.org Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge branch 'linus' into stackprotectorIngo Molnar2008-12-311-52/+65
|\| | | | | | | | | | | Conflicts: arch/x86/include/asm/pda.h kernel/fork.c
| * Merge branch 'core/debug' into core/coreIngo Molnar2008-12-251-20/+12
| |\
| | * debug warnings: eliminate warn_on_slowpath()Ingo Molnar2008-11-281-6/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: cleanup, eliminate code now that warn_on_slowpath() uses warn_slowpath(...,NULL), we can eliminate warn_on_slowpath() altogether and use warn_slowpath(). Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * debug warnings: print the DMI board info name in a WARN/WARN_ONArjan van de Ven2008-11-281-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: extend WARN_ON() output with DMI_PRODUCT_NAME It's very useful for many low level WARN_ON's to find out which motherboard has the broken BIOS etc... this patch adds a printk to the WARN_ON code for this. On architectures without DMI, gcc should optimize the code out. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * debug warnings: consolidate warn_slowpath and warn_on_slowpathArjan van de Ven2008-11-281-20/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: cleanup, code reduction warn_slowpath is a superset of warn_on_slowpath; just have warn_on_slowpath call warn_slowpath with a NULL 3rd argument. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | taint: add missing commentArjan van de Ven2008-12-021-0/+1
| |/ | | | | | | | | | | | | | | | | The description for 'D' was missing in the comment... (causing me a minute of WTF followed by looking at more of the code) Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * Make panic= and panic_on_oops into core_paramsRusty Russell2008-10-221-14/+3
| | | | | | | | | | | | | | This allows them to be examined and set after boot, plus means they actually give errors if they are misused (eg. panic=yes). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| * Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6Linus Torvalds2008-10-171-0/+2
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6: (25 commits) staging: at76_usb wireless driver Staging: workaround build system bug Staging: Lindent sxg.c Staging: SLICOSS: Call pci_release_regions at driver exit Staging: SLICOSS: Fix remaining type names Staging: SLICOSS: Fix warnings due to static usage Staging: SLICOSS: lots of checkpatch fixes Staging: go7007 v4l fixes Staging: Fix gcc warnings in sxg Staging: add echo cancelation module Staging: add wlan-ng prism2 usb driver Staging: add w35und wifi driver Staging: USB/IP: add host driver Staging: USB/IP: add client driver Staging: USB/IP: add common functions needed Staging: add the go7007 video driver Staging: add me4000 pci data collection driver Staging: add me4000 firmware files Staging: add sxg network driver Staging: add Alacritech slicoss network driver ... Fixed up conflicts due to taint flags changes and MAINTAINERS cleanup in MAINTAINERS, include/linux/kernel.h and kernel/panic.c.
| | * Staging: add TAINT_CRAP for all drivers/staging codeGreg Kroah-Hartman2008-10-111-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to add a flag for all code that is in the drivers/staging/ directory to prevent all other kernel developers from worrying about issues here, and to notify users that the drivers might not be as good as they are normally used to. Based on code from Andreas Gruenbacher and Jeff Mahoney to provide a TAINT flag for the support level of a kernel module in the Novell enterprise kernel release. This is the kernel portion of this feature, the ability for the flag to be set needs to be done in the build process and will happen in a follow-up patch. Cc: Andreas Gruenbacher <agruen@suse.de> Cc: Jeff Mahoney <jeffm@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | taint: fix kernel-docRandy Dunlap2008-10-161-15/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move print_tainted() kernel-doc to avoid the following error: Error(/var/linsrc/mmotm-2008-1002-1617//kernel/panic.c:155): cannot understand prototype: 'struct tnt ' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * | Make the taint flags reliableAndi Kleen2008-10-161-17/+46
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It's somewhat unlikely that it happens, but right now a race window between interrupts or machine checks or oopses could corrupt the tainted bitmap because it is modified in a non atomic fashion. Convert the taint variable to an unsigned long and use only atomic bit operations on it. Unfortunately this means the intvec sysctl functions cannot be used on it anymore. It turned out the taint sysctl handler could actually be simplified a bit (since it only increases capabilities) so this patch actually removes code. [akpm@linux-foundation.org: remove unneeded include] Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge branch 'linus' into stackprotectorIngo Molnar2008-10-151-0/+22
|\| | | | | | | | | | | Conflicts: arch/x86/kernel/Makefile include/asm-x86/pda.h
| * Add a WARN() macro; this is WARN_ON() + printk argumentsArjan van de Ven2008-07-251-0/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | Add a WARN() macro that acts like WARN_ON(), with the added feature that it takes a printk like argument that is printed as part of the warning message. [akpm@linux-foundation.org: fix printk arguments] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Greg KH <greg@kroah.com> Cc: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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