Rokudo Yan 02f768edb9 zsmalloc: account the number of compacted pages correctly ... commit 2395928158 upstream. There exists multiple path may do zram compaction concurrently. 1. auto-compaction triggered during memory reclaim 2. userspace utils write zram<id>/compaction node So, multiple threads may call zs_shrinker_scan/zs_compact concurrently. But pages_compacted is a per zsmalloc pool variable and modification of the variable is not serialized(through under class->lock). There are two issues here: 1. the pages_compacted may not equal to total number of pages freed(due to concurrently add). 2. zs_shrinker_scan may not return the correct number of pages freed(issued by current shrinker). The fix is simple: 1. account the number of pages freed in zs_compact locally. 2. use actomic variable pages_compacted to accumulate total number. Link: https://lkml.kernel.org/r/20210202122235.26885-1-wu-yan@tcl.com Fixes: 860c707dca ("zsmalloc: account the number of compacted pages") Signed-off-by: Rokudo Yan <wu-yan@tcl.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-03-07 12:34:15 +01:00
..
acpi	ACPICA: Fix exception code class checks	2021-03-04 11:37:24 +01:00
asm-generic	vmlinux.lds.h: Define SANTIZER_DISCARDS with CONFIG_GCOV_KERNEL=y	2021-03-04 11:37:19 +01:00
clocksource
crypto
drm	drm/dp/mst: Export drm_dp_get_vc_payload_bw()	2021-02-10 09:29:18 +01:00
dt-bindings	ASoC: dt-bindings: lpass: Fix and common up lpass dai ids	2021-02-03 23:28:46 +01:00
keys
kunit	kunit: fix display of failed expectations for strings	2020-11-10 13:45:15 -07:00
kvm	ARM:	2020-10-23 11:17:56 -07:00
linux	zsmalloc: account the number of compacted pages correctly	2021-03-07 12:34:15 +01:00
math-emu
media	media: v4l2-fwnode: v4l2_fwnode_endpoint_parse caller must init vep argument	2020-12-30 11:53:11 +01:00
memory
misc
net	Bluetooth: Add new HCI_QUIRK_NO_SUSPEND_NOTIFIER quirk	2021-03-07 12:34:10 +01:00
pcmcia
ras	mm,hwpoison: introduce MF_MSG_UNSPLIT_THP	2020-10-16 11:11:17 -07:00
rdma	RDMA: Lift ibdev_to_node from rds to common code	2021-02-26 10:12:59 +01:00
scsi	scsi: libiscsi: Fix NOP race condition	2020-11-16 22:32:50 -05:00
soc	net: dsa: felix: implement port flushing on .phylink_mac_link_down	2021-02-17 11:02:27 +01:00
sound	ASoC: Fixes for v5.11	2020-11-19 19:56:29 +01:00
target
trace	trace: fix potenial dangerous pointer	2020-11-25 13:03:44 +01:00
uapi	net/sched: cls_flower: Reject invalid ct_state flags rules	2021-03-07 12:34:07 +01:00
vdso
video	gpu: ipu-v3: remove unused functions	2020-10-26 10:42:38 +01:00
xen	Xen/gntdev: correct error checking in gntdev_map_grant_pages()	2021-02-23 15:53:24 +01:00