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We now have only one active post-processing at any time, so we don't have same race conditions that we had before. If slot selected for post-processing gets freed or freed and reallocated it loses its PP_SLOT flag and there is no way for such a slot to gain PP_SLOT flag again until current post-processing terminates. Link: https://lkml.kernel.org/r/20240917021020.883356-8-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>