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The pcp locking relies on pcp_spin_trylock() which has to be used together with pcp_trylock_prepare()/pcp_trylock_finish() to work properly on !SMP !RT configs. This is tedious and error-prone. We can remove pcp_spin_lock() and underlying pcpu_spin_lock() because we don't use it. Afterwards pcp_spin_unlock() is only used together with pcp_spin_trylock(). Therefore we can add the UP_flags parameter to them both and handle pcp_trylock_prepare()/finish() within. Additionally for the configs where pcp_trylock_prepare()/finish() are no-op (SMP || RT) make them pass &UP_flags to a no-op inline function. This ensures typechecking and makes the local variable "used" so we can remove the __maybe_unused attributes. In my compile testing, bloat-o-meter reported no change on SMP config, so the compiler is capable of optimizing away the no-ops same as before, and we have simplified the code using pcp_spin_trylock(). Link: https://lkml.kernel.org/r/20251015-b4-pcp-lock-cleanup-v2-1-740d999595d5@suse.cz Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Cc: Brendan Jackman <jackmanb@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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| 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 reStructuredText 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.