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Chengming Zhou c2dc78b86e mm/ksm: fix ksm_zero_pages accounting 
We normally ksm_zero_pages++ in ksmd when page is merged with zero page,
but ksm_zero_pages-- is done from page tables side, where there is no any
accessing protection of ksm_zero_pages.

So we can read very exceptional value of ksm_zero_pages in rare cases,
such as -1, which is very confusing to users.

Fix it by changing to use atomic_long_t, and the same case with the
mm->ksm_zero_pages.

Link: https://lkml.kernel.org/r/20240528-b4-ksm-counters-v3-2-34bb358fdc13@linux.dev
Fixes: e2942062e0 ("ksm: count all zero pages placed by KSM")
Fixes: 6080d19f07 ("ksm: add ksm zero pages for each process")
Signed-off-by: Chengming Zhou <chengming.zhou@linux.dev>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ran Xiaokai <ran.xiaokai@zte.com.cn>
Cc: Stefan Roesch <shr@devkernel.io>
Cc: xu xin <xu.xin16@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-06-05 19:19:26 -07:00
..
acpi The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
asm-generic asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
clocksource
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
drm drm fixes for 6.10-rc1 2024-05-24 17:28:02 -07:00
dt-bindings - Core Frameworks 2024-05-22 10:49:54 -07:00
keys Hi, 2024-05-13 10:40:15 -07:00
kunit kunit: Print last test location on fault 2024-05-06 14:22:02 -06:00
kvm Merge branch kvm-arm64/misc-6.10 into kvmarm-master/next 2024-05-08 16:41:50 +01:00
linux mm/ksm: fix ksm_zero_pages accounting 2024-06-05 19:19:26 -07:00
math-emu
media media: cec.h: Fix kerneldoc 2024-05-04 10:19:59 +02:00
memory
misc
net more s390 updates for 6.10 merge window 2024-05-21 12:09:36 -07:00
pcmcia
ras tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
rdma The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
rv
scsi SCSI misc on 20240514 2024-05-14 18:25:53 -07:00
soc I'm actually surprised this time. There aren't any new Qualcomm SoC clk 2024-05-18 12:48:37 -07:00
sound ASoC: Fixes for v6.10 2024-05-23 13:29:27 +02:00
target
trace block-6.10-20240523 2024-05-23 13:44:47 -07:00
uapi drm fixes for 6.10-rc1 2024-05-24 17:28:02 -07:00
ufs
vdso
video
xen