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58652f2b6d
Both recompress and writeback soon will unlock slots during processing, which makes things too complex wrt possible race-conditions. We still want to clear PP_SLOT in slot_free, because this is how we figure out that slot that was selected for post-processing has been released under us and when we start post-processing we check if slot still has PP_SLOT set. At the same time, theoretically, we can have something like this: CPU0 CPU1 recompress scan slots set PP_SLOT unlock slot slot_free clear PP_SLOT allocate PP_SLOT writeback scan slots set PP_SLOT unlock slot select PP-slot test PP_SLOT So recompress will not detect that slot has been re-used and re-selected for concurrent writeback post-processing. Make sure that we only permit on post-processing operation at a time. So now recompress and writeback post-processing don't race against each other, we only need to handle slot re-use (slot_free and write), which is handled individually by each pp operation. Having recompress and writeback competing for the same slots is not exactly good anyway (can't imagine anyone doing that). Link: https://lkml.kernel.org/r/20240917021020.883356-3-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Minchan Kim <minchan@kernel.org> 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 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.