mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-03 21:45:08 -04:00
f785a8f21a
A memcg pointer in the percpu stock can be accessed by drain_all_stock() from another cpu in a lockless way. In theory it might lead to an issue, similar to the one which has been discovered with stock->cached_objcg, where the pointer was zeroed between the check for being NULL and dereferencing. In this case the issue is unlikely a real problem, but to make it bulletproof and similar to stock->cached_objcg, let's annotate all accesses to stock->cached with READ_ONCE()/WTRITE_ONCE(). Link: https://lkml.kernel.org/r/20230502160839.361544-2-roman.gushchin@linux.dev Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev> Acked-by: Shakeel Butt <shakeelb@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Yosry Ahmed <yosryahmed@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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.