Hidetoshi Seto cab8bd3410 sysrq, kdump: make sysrq-c consistent ... commit d6580a9f15 ("kexec: sysrq: simplify sysrq-c handler") changed the behavior of sysrq-c to unconditional dereference of NULL pointer. So in cases with CONFIG_KEXEC, where crash_kexec() was directly called from sysrq-c before, now it can be said that a step of "real oops" was inserted before starting kdump. However, in contrast to oops via SysRq-c from keyboard which results in panic due to in_interrupt(), oops via "echo c > /proc/sysrq-trigger" will not become panic unless panic_on_oops=1. It means that even if dump is properly configured to be taken on panic, the sysrq-c from proc interface might not start crashdump while the sysrq-c from keyboard can start crashdump. This confuses traditional users of kdump, i.e. people who expect sysrq-c to do common behavior in both of the keyboard and proc interface. This patch brings the keyboard and proc interface behavior of sysrq-c in line, by forcing panic_on_oops=1 before oops in sysrq-c handler. And some updates in documentation are included, to clarify that there is no longer dependency with CONFIG_KEXEC, and that now the system can just crash by sysrq-c if no dump mechanism is configured. Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Cc: Brayan Arraes <brayan@yack.com.br> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-07-29 19:10:36 -07:00
..
ABI	Merge git://git.infradead.org/mtd-2.6	2009-06-22 16:56:22 -07:00
DocBook	mac80211: fix docbook	2009-07-08 15:24:28 -04:00
PCI	PCI AER: software error injection	2009-06-16 14:30:14 -07:00
RCU	netfilter: nf_conntrack: nf_conntrack_alloc() fixes	2009-07-16 14:03:40 +02:00
accounting	Documentation/accounting/getdelays.c intialize the variable before using it	2009-06-16 19:47:51 -07:00
acpi	…
aoe	…
arm	[ARM] S3C24XX: GPIO: Change to macros for GPIO numbering	2009-05-18 16:26:03 +01:00
auxdisplay	…
blackfin	…
block	Trivial typo fixes in Documentation/block/data-integrity.txt.	2009-07-01 10:56:25 +02:00
blockdev	mflash: initial support	2009-04-07 08:12:38 +02:00
cdrom	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
cgroups	cpusets: document adding/removing cpus to cpuset elaborately	2009-06-30 18:56:01 -07:00
connector	connector: maintainer/mail update.	2009-07-21 12:43:51 -07:00
console	…
cpu-freq	[CPUFREQ] minor correction to cpu-freq documentation	2009-06-15 11:49:42 -04:00
cpuidle	…
cris	…
crypto	…
development-process	docs: Encourage better changelogs in the development process document	2009-06-04 10:32:49 -06:00
device-mapper	dm raid1: add userspace log	2009-06-22 10:12:35 +01:00
driver-model	driver model: fix show/store prototypes in doc.	2009-07-12 13:02:10 -07:00
dvb	V4L/DVB (12206): get_dvb_firmware: Correct errors in MPC718 firmware extraction logic	2009-07-05 19:21:49 -03:00
early-userspace	…
fault-injection	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
fb	Documentation/fb/vesafb.txt: fix typo	2009-06-16 19:47:58 -07:00
filesystems	driver core: documentation: make it clear that sysfs is optional	2009-07-28 13:45:23 -07:00
firmware_class	driver core: fix documentation of request_firmware_nowait	2009-06-15 21:30:24 -07:00
frv	…
hwmon	hwmon: (f71882fg) Add support for the F71858F	2009-06-15 18:39:52 +02:00
i2c	i2c: Add a sysfs interface to instantiate devices	2009-06-19 16:58:20 +02:00
i2o	…
ia64	…
ide	ide: preserve Host Protected Area by default (v2)	2009-06-07 13:52:52 +02:00
infiniband	IPoIB: Document newish features	2009-04-08 13:52:01 -07:00
input	Merge commit 'v2.6.30' into next	2009-06-11 01:58:01 -07:00
ioctl	LinuxPPS: core support	2009-06-18 13:04:04 -07:00
isdn	isdn: clean up documentation index	2009-06-20 01:10:38 -07:00
ja_JP	block: rename CONFIG_LBD to CONFIG_LBDAF	2009-06-19 08:08:50 +02:00
kbuild	kconfig: resort the documentation of the environment variables	2009-06-09 22:37:47 +02:00
kdump	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
ko_KR	…
laptops	Merge branches 'acerhdf', 'acpi-pci-bind', 'bjorn-pci-root', 'bugzilla-12904', 'bugzilla-13121', 'bugzilla-13396', 'bugzilla-13533', 'bugzilla-13612', 'c3_lock', 'hid-cleanups', 'misc-2.6.31', 'pdc-leak-fix', 'pnpacpi', 'power_nocheck', 'thinkpad_acpi', 'video' and 'wmi' into release	2009-06-24 01:19:50 -04:00
lguest	lguest: add support for indirect ring entries	2009-06-12 22:27:13 +09:30
m68k	…
make	…
mips	…
misc-devices	…
mn10300	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
mtd	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
namespaces	…
netlabel	…
networking	Update Andreas Koensgen's email address	2009-07-17 10:07:12 -07:00
parisc	…
pcmcia	…
power	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
powerpc	Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds	2009-06-28 11:02:32 -07:00
pps	LinuxPPS: core support	2009-06-18 13:04:04 -07:00
prctl	…
s390	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
scheduler	sched: Documentation/sched-rt-group: Fix style issues & bump version	2009-06-21 13:12:46 +02:00
scsi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6	2009-06-17 09:50:44 -07:00
serial	…
sh	…
sound	ALSA: pcm - Add logging of hwptr updates and interrupt updates	2009-07-23 11:09:03 +02:00
sparc	…
spi	spi: new spi->mode bits	2009-06-30 18:56:00 -07:00
sysctl	vmscan: properly account for the number of page cache pages zone_reclaim() can reclaim	2009-06-16 19:47:45 -07:00
telephony	…
thermal	…
timers	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
trace	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
uml	…
usb	trivial: usb: fix missing space typo in doc	2009-06-12 18:01:51 +02:00
video4linux	V4L/DVB (12283): gspca - sn9c20x: New subdriver for sn9c201 and sn9c202 bridges.	2009-07-24 14:03:30 -03:00
vm	Documentation/vm/Makefile: don't try to build slqbinfo	2009-06-17 09:45:46 -07:00
w1	…
watchdog	[WATCHDOG] hpwdt: Add NMI priority option	2009-06-23 07:13:45 +00:00
wimax	…
x86	Doc: move Documentation/exception.txt into x86 subdir	2009-07-10 19:10:32 -07:00
zh_CN	…
00-INDEX	…
BUG-HUNTING	…
Changes	Documentation/Changes: perl is needed to build the kernel	2009-06-18 13:03:46 -07:00
CodingStyle	trivial: fix typo milisecond/millisecond for documentation and source comments.	2009-06-12 18:01:46 +02:00
DMA-API.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
DMA-ISA-LPC.txt	…
DMA-attributes.txt	…
DMA-mapping.txt	dma-mapping: update the old macro DMA_nBIT_MASK related documentations	2009-04-07 08:31:12 -07:00
HOWTO	…
IO-mapping.txt	…
IPMI.txt	…
IRQ-affinity.txt	…
IRQ.txt	…
Intel-IOMMU.txt	…
Makefile	…
ManagementStyle	…
SAK.txt	…
SELinux.txt	…
SM501.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
SecurityBugs	…
Smack.txt	smack: implement logging V3	2009-04-14 09:00:23 +10:00
SubmitChecklist	block: rename CONFIG_LBD to CONFIG_LBDAF	2009-06-19 08:08:50 +02:00
SubmittingDrivers	…
SubmittingPatches	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
VGA-softcursor.txt	…
applying-patches.txt	…
atomic_ops.txt	Documentation/atomic_ops.txt: fix sample code	2009-06-16 19:47:52 -07:00
bad_memory.txt	…
basic_profiling.txt	…
binfmt_misc.txt	…
braille-console.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
bt8xxgpio.txt	…
c2port.txt	…
cachetlb.txt	…
cpu-hotplug.txt	…
cpu-load.txt	…
cputopology.txt	…
credentials.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	…
dell_rbu.txt	trivial: Documentation/dell_rbu.txt: fix typos	2009-06-12 18:01:50 +02:00
devices.txt	lanana: assign a device name and numbering for MAX3100	2009-04-07 08:44:05 -07:00
dmaengine.txt	…
dontdiff	…
dynamic-debug-howto.txt	…
edac.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
eisa.txt	…
email-clients.txt	…
feature-removal-schedule.txt	[CPUFREQ] Mark policy_rwsem as going static in cpufreq.c wont be exported	2009-07-06 21:38:28 -04:00
futex-requeue-pi.txt	futex: add requeue-pi documentation	2009-05-09 07:12:50 +02:00
gcov.txt	gcov: fix documentation	2009-06-30 18:55:59 -07:00
gpio.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
highuid.txt	…
hw_random.txt	…
ics932s401	…
initrd.txt	…
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	…
isapnp.txt	…
java.txt	…
kernel-doc-nano-HOWTO.txt	kernel-doc: restrict syntax for private: and public:	2009-05-02 15:36:10 -07:00
kernel-docs.txt	…
kernel-parameters.txt	Merge branch 'core-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-07-10 14:25:59 -07:00
keys-request-key.txt	…
keys.txt	…
kmemcheck.txt	kmemcheck: add the kmemcheck documentation	2009-06-13 14:27:20 +02:00
kmemleak.txt	kmemleak: Do not trigger a scan when reading the debug/kmemleak file	2009-06-26 17:38:27 +01:00
kobject.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
kprobes.txt	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
kref.txt	…
ldm.txt	…
leds-class.txt	…
leds-lp3944.txt	leds: LED driver for National Semiconductor LP3944 Funlight Chip	2009-06-23 20:21:38 +01:00
local_ops.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
lockdep-design.txt	locking: Documentation: lockdep-design.txt, fix note of state bits	2009-04-26 18:21:24 +02:00
lockstat.txt	…
logo.gif	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
logo.txt	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
magic-number.txt	…
markers.txt	…
mca.txt	…
md.txt	…
memory-barriers.txt	sched: Document memory barriers implied by sleep/wake-up primitives	2009-04-29 14:15:55 +02:00
memory-hotplug.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
memory.txt	…
mono.txt	…
mutex-design.txt	…
nmi_watchdog.txt	…
nommu-mmap.txt	…
numastat.txt	…
oops-tracing.txt	…
parport-lowlevel.txt	…
parport.txt	…
pi-futex.txt	…
pnp.txt	…
preempt-locking.txt	…
printk-formats.txt	…
prio_tree.txt	…
rbtree.txt	trivial: rbtree.txt: fix rb_entry() parameters in sample code	2009-06-12 18:01:47 +02:00
rfkill.txt	rfkill: export persistent attribute in sysfs	2009-06-19 11:50:18 -04:00
robust-futex-ABI.txt	futex: documentation: fix inconsistent description of futex list_op_pending	2009-06-18 13:03:56 -07:00
robust-futexes.txt	…
rt-mutex-design.txt	…
rt-mutex.txt	…
rtc.txt	…
serial-console.txt	…
sgi-ioc4.txt	…
sgi-visws.txt	…
slow-work.txt	…
sparse.txt	Documentation: explain the difference between __bitwise and __bitwise__	2009-04-11 08:18:11 +02:00
spinlocks.txt	…
stable_api_nonsense.txt	…
stable_kernel_rules.txt	…
svga.txt	…
sysfs-rules.txt	Doc/sysfs-rules: Swap the order of the words so the sentence makes more sense	2009-05-08 19:22:20 -07:00
sysrq.txt	sysrq, kdump: make sysrq-c consistent	2009-07-29 19:10:36 -07:00
tomoyo.txt	tomoyo: add Documentation/tomoyo.txt	2009-04-14 09:14:58 +10:00
unaligned-memory-access.txt	…
unicode.txt	…
unshare.txt	…
video-output.txt	…
volatile-considered-harmful.txt	…
voyager.txt	…
zorro.txt	…