John Ogness 40ddbbac7f mtd: mtdoops: synchronize kmsg_dumper ... The kmsg_dumper can be called from any context and CPU, possibly from multiple CPUs simultaneously. Since the writing of the buffer can occur from a later scheduled work queue, the oops buffer must be protected against simultaneous dumping. Use an atomic bit to mark when the buffer is protected. Release the protection in between setting the buffer and the actual writing in order for a possible panic (immediate write) to be written during the scheduling of a previous oops (delayed write). An atomic bit (rather than a spinlock) was chosen so that no scheduling or preemption side-effects would be introduced. The MTD kmsg_dumper may dump directly or it may be delayed (via scheduled work). Depending on the context, different MTD callbacks are used. For example, mtd_write() expects to be called in a non-atomic context and may take a mutex. Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20210303101528.29901-3-john.ogness@linutronix.de		2021-03-08 11:42:46 +01:00
..
accessibility	…
acpi	- Use the newly introduced 'hot' and 'critical' ops for the acpi	2021-02-22 09:39:11 -08:00
amba	…
android	…
ata	…
atm	atm: idt77252: fix build broken on amd64	2021-02-15 12:36:27 -08:00
auxdisplay	…
base	Devicetree updates for v5.12:	2021-02-22 10:05:12 -08:00
bcma	…
block	xen: branch for v5.12-rc1	2021-02-21 13:06:08 -08:00
bluetooth	TTY/Serial driver changes for 5.12-rc1	2021-02-20 21:28:04 -08:00
bus	ARM: SoC drivers for v5.12	2021-02-20 18:42:28 -08:00
cdrom	…
char	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2021-02-21 17:23:56 -08:00
clk	This is all driver updates, the majority of which is a bunch of new Qualcomm	2021-02-22 09:45:23 -08:00
clocksource	hyperv-next for 5.12	2021-02-21 13:24:39 -08:00
connector	…
counter	…
cpufreq	Merge branch 'pm-opp' into pm	2021-02-15 17:01:46 +01:00
cpuidle	…
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2021-02-21 17:23:56 -08:00
dax	…
dca	…
devfreq	Merge branches 'pm-devfreq' and 'pm-tools'	2021-02-15 17:02:04 +01:00
dio	…
dma	dmaengine dw: Revert "dmaengine: dw: Enable runtime PM"	2021-02-08 17:36:12 +05:30
dma-buf	dma-buf: Avoid comma separated statements	2021-02-09 17:14:11 +01:00
edac	Merge branch 'edac-misc' into edac-updates-for-v5.12	2021-02-15 10:06:58 +01:00
eisa	…
extcon	…
firewire	…
firmware	MMC core:	2021-02-22 09:05:28 -08:00
fpga	…
fsi	…
gnss	…
gpio	gpio updates for v5.12	2021-02-22 10:00:46 -08:00
gpu	platform-drivers-x86 for v5.12-1	2021-02-22 08:50:01 -08:00
greybus	…
hid	Staging/IIO driver patches for 5.12-rc1	2021-02-20 21:36:51 -08:00
hsi	…
hv	Revert "Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer"	2021-02-15 10:49:11 +00:00
hwmon	Devicetree updates for v5.12:	2021-02-22 10:05:12 -08:00
hwspinlock	…
hwtracing	…
i2c	Merge branch 'i2c/for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2021-02-22 09:02:24 -08:00
i3c	I3C for 5.12	2021-02-22 09:52:55 -08:00
ide	…
idle	…
iio	- Use the newly introduced 'hot' and 'critical' ops for the acpi	2021-02-22 09:39:11 -08:00
infiniband	Linux 5.11	2021-02-18 11:19:29 -04:00
input	sound updates for 5.12	2021-02-21 14:21:35 -08:00
interconnect	…
iommu	IOMMU Updates for Linux v5.12	2021-02-22 10:31:29 -08:00
ipack	…
irqchip	irqchip updates for Linux 5.12:	2021-02-15 15:41:56 +01:00
isdn	…
leds	TTY/Serial driver changes for 5.12-rc1	2021-02-20 21:28:04 -08:00
lightnvm	lightnvm: pblk: Replace guid_copy() with export_guid()/import_guid()	2021-02-14 21:27:24 -07:00
macintosh	…
mailbox	…
mcb	…
md	- Fix DM integrity's HMAC support to provide enhanced security of	2021-02-22 10:22:54 -08:00
media	Devicetree updates for v5.12:	2021-02-22 10:05:12 -08:00
memory	IOMMU Updates for Linux v5.12	2021-02-22 10:31:29 -08:00
memstick	…
message	…
mfd	- Core Frameworks	2021-02-22 09:29:42 -08:00
misc	…
mmc	MMC core:	2021-02-22 09:05:28 -08:00
most	…
mtd	mtd: mtdoops: synchronize kmsg_dumper	2021-03-08 11:42:46 +01:00
mux	…
net	RDMA 5.12 merge window pull request	2021-02-22 10:27:48 -08:00
nfc	nfc: st-nci: Remove unnecessary variable	2021-02-08 14:56:20 -08:00
ntb	…
nubus	…
nvdimm	for-5.12/block-2021-02-17	2021-02-21 11:02:48 -08:00
nvme	for-5.12/drivers-2021-02-17	2021-02-21 11:06:54 -08:00
nvmem	…
of	Devicetree updates for v5.12:	2021-02-22 10:05:12 -08:00
opp	…
parisc	…
parport	…
pci	drm pull for 5.12-rc1	2021-02-21 14:44:44 -08:00
pcmcia	…
perf	IOMMU Updates for Linux v5.12	2021-02-22 10:31:29 -08:00
phy	…
pinctrl	gpio: visconti: Add Toshiba Visconti GPIO support	2021-02-15 11:43:26 +01:00
platform	- Use the newly introduced 'hot' and 'critical' ops for the acpi	2021-02-22 09:39:11 -08:00
pnp	…
power	…
powercap	powercap: intel_rapl: Use topology interface in rapl_init_domains()	2021-02-12 16:53:01 +01:00
pps	…
ps3	…
ptp	ptp: ptp_clockmatrix: clean-up - parenthesis around a == b are unnecessary	2021-02-17 13:49:26 -08:00
pwm	…
rapidio	…
ras	…
regulator	- Core Frameworks	2021-02-22 09:29:42 -08:00
remoteproc	…
reset	ARM: SoC drivers for v5.12	2021-02-20 18:42:28 -08:00
rpmsg	…
rtc	RTC for 5.12	2021-02-22 09:54:19 -08:00
s390	SCSI misc on 20210219	2021-02-22 10:24:58 -08:00
sbus	…
scsi	SCSI misc on 20210219	2021-02-22 10:24:58 -08:00
sfi	…
sh	…
siox	…
slimbus	…
soc	This is all driver updates, the majority of which is a bunch of new Qualcomm	2021-02-22 09:45:23 -08:00
soundwire	…
spi	spi: Updates for v5.12	2021-02-22 09:19:08 -08:00
spmi	…
ssb	…
staging	media updates for v5.12-rc1	2021-02-21 14:10:36 -08:00
target	SCSI misc on 20210219	2021-02-22 10:24:58 -08:00
tc	…
tee	Simplify i2c acess in OP-TEE driver	2021-02-09 16:10:49 +01:00
thermal	- Use the newly introduced 'hot' and 'critical' ops for the acpi	2021-02-22 09:39:11 -08:00
thunderbolt	thunderbolt: Changes for v5.12 merge window	2021-02-09 13:00:07 +01:00
tty	Devicetree updates for v5.12:	2021-02-22 10:05:12 -08:00
uio	…
usb	Devicetree updates for v5.12:	2021-02-22 10:05:12 -08:00
vdpa	…
vfio	…
vhost	…
video	- New Functionality	2021-02-22 09:27:18 -08:00
virt	…
virtio	…
visorbus	…
vlynq	…
vme	…
w1	…
watchdog	linux-watchdog 5.12-rc1 tag	2021-02-22 09:07:51 -08:00
xen	xen: branch for v5.12-rc1	2021-02-21 13:06:08 -08:00
zorro	…
Kconfig	…
Makefile	…