Zefan Li bbc314da7d cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags ... commit 2ad654bc5e2b211e92f66da1d819e47d79a866f0 upstream. When we change cpuset.memory_spread_{page,slab}, cpuset will flip PF_SPREAD_{PAGE,SLAB} bit of tsk->flags for each task in that cpuset. This should be done using atomic bitops, but currently we don't, which is broken. Tetsuo reported a hard-to-reproduce kernel crash on RHEL6, which happened when one thread tried to clear PF_USED_MATH while at the same time another thread tried to flip PF_SPREAD_PAGE/PF_SPREAD_SLAB. They both operate on the same task. Here's the full report: https://lkml.org/lkml/2014/9/19/230 To fix this, we make PF_SPREAD_PAGE and PF_SPREAD_SLAB atomic flags. v4: - updated mm/slab.c. (Fengguang Wu) - updated Documentation. Change-Id: I4eef89f5d91eaa2e7e677e662133a7856909a13f Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Miao Xie <miaox@cn.fujitsu.com> Cc: Kees Cook <keescook@chromium.org> Fixes: 950592f7b9 ("cpusets: update tasks' page/slab spread flags in time") Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Zefan Li <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>		2019-07-27 21:44:59 +02:00
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acpi
asm-generic
clocksource
crypto	crypto: crypto_memneq - add equality testing of memory regions w/o timing leaks	2019-07-27 21:42:52 +02:00
drm
dt-bindings
keys
kvm
linux	cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags	2019-07-27 21:44:59 +02:00
math-emu
media
memory
misc
net	xfrm: fix stack access out of bounds with CONFIG_XFRM_SUB_POLICY	2019-07-27 21:44:51 +02:00
pcmcia
ras
rdma	RDMA/core: Fix incorrect structure packing for booleans	2019-07-27 21:43:09 +02:00
rxrpc
scsi
sdp
soc/qcom
sound
target	target: Avoid mappedlun symlink creation during lun shutdown	2019-07-27 21:44:16 +02:00
trace	tracing: Add #undef to fix compile error	2019-07-27 21:43:11 +02:00
uapi	uapi: fix linux/packet_diag.h userspace compilation error	2019-07-27 21:44:00 +02:00
video
xen
Kbuild