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Main-line Linux kernel tree http://www.kernel.org
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Johannes Weiner 969d63e1af mm: zswap: fix pool refcount bug around shrink_worker() 
When a zswap store fails due to the limit, it acquires a pool reference
and queues the shrinker.  When the shrinker runs, it drops the reference. 
However, there can be multiple store attempts before the shrinker wakes up
and runs once.  This results in reference leaks and eventual saturation
warnings for the pool refcount.

Fix this by dropping the reference again when the shrinker is already
queued.  This ensures one reference per shrinker run.

Link: https://lkml.kernel.org/r/20231006160024.170748-1-hannes@cmpxchg.org
Fixes: 45190f01dd ("mm/zswap.c: add allocation hysteresis if pool limit is hit")
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-by: Chris Mason <clm@fb.com>
Acked-by: Nhat Pham <nphamcs@gmail.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: <stable@vger.kernel.org>	[5.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-10-18 12:12:40 -07:00
arch riscv: fix set_huge_pte_at() for NAPOT mappings when a swap entry is set 2023-10-06 14:11:38 -07:00
block
certs
crypto
Documentation Kbuild fixes for v6.6 (2nd) 2023-10-01 13:48:46 -07:00
drivers Misc driver fix for 6.6-rc4 2023-10-01 12:50:04 -07:00
fs Fourteen hotfixes, eleven of which are cc:stable. The remainder pertain 2023-10-01 13:33:25 -07:00
include Kbuild fixes for v6.6 (2nd) 2023-10-01 13:48:46 -07:00
init
io_uring
ipc
kernel Fourteen hotfixes, eleven of which are cc:stable. The remainder pertain 2023-10-01 13:33:25 -07:00
lib
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mm mm: zswap: fix pool refcount bug around shrink_worker() 2023-10-18 12:12:40 -07:00
net
rust
samples
scripts
security
sound
tools Fourteen hotfixes, eleven of which are cc:stable. The remainder pertain 2023-10-01 13:33:25 -07:00
usr
virt
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.cocciconfig
.get_maintainer.ignore
.gitattributes
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Makefile Linux 6.6-rc4 2023-10-01 14:15:13 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.