https://github.com/torvalds/linux
Revision 1a87aa03597efa9641e92875b883c94c7f872ccb authored by Henry Burns on 25 August 2019, 00:55:03 UTC, committed by Linus Torvalds on 25 August 2019, 02:48:42 UTC
In zs_page_migrate() we call putback_zspage() after we have finished migrating all pages in this zspage. However, the return value is ignored. If a zs_free() races in between zs_page_isolate() and zs_page_migrate(), freeing the last object in the zspage, putback_zspage() will leave the page in ZS_EMPTY for potentially an unbounded amount of time. To fix this, we need to do the same thing as zs_page_putback() does: schedule free_work to occur. To avoid duplicated code, move the sequence to a new putback_zspage_deferred() function which both zs_page_migrate() and zs_page_putback() call. Link: http://lkml.kernel.org/r/20190809181751.219326-1-henryburns@google.com Fixes: 48b4800a1c6a ("zsmalloc: page migration support") Signed-off-by: Henry Burns <henryburns@google.com> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Henry Burns <henrywolfeburns@gmail.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Shakeel Butt <shakeelb@google.com> Cc: Jonathan Adams <jwadams@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tip revision: 1a87aa03597efa9641e92875b883c94c7f872ccb authored by Henry Burns on 25 August 2019, 00:55:03 UTC
mm/zsmalloc.c: migration can leave pages in ZS_EMPTY indefinitely
mm/zsmalloc.c: migration can leave pages in ZS_EMPTY indefinitely
Tip revision: 1a87aa0
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