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| author | Henry Burns <henryburns@google.com> | 2019-07-16 16:26:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-16 19:23:21 -0700 |
| commit | be03074c9af25d06cf8e9ebddfcd284c0bf7f947 (patch) | |
| tree | cf728058af2776e978daffd645cdc09c18e0722f /mm | |
| parent | 1732d2b0117c26a6bf6027c919e49603156ea93d (diff) | |
| download | lwn-be03074c9af25d06cf8e9ebddfcd284c0bf7f947.tar.gz lwn-be03074c9af25d06cf8e9ebddfcd284c0bf7f947.zip | |
mm/z3fold.c: remove z3fold_migration trylock
z3fold_page_migrate() will never succeed because it attempts to acquire
a lock that has already been taken by migrate.c in __unmap_and_move().
__unmap_and_move() migrate.c
trylock_page(oldpage)
move_to_new_page(oldpage_newpage)
a_ops->migrate_page(oldpage, newpage)
z3fold_page_migrate(oldpage, newpage)
trylock_page(oldpage)
Link: http://lkml.kernel.org/r/20190710213238.91835-1-henryburns@google.com
Fixes: 1f862989b04a ("mm/z3fold.c: support page migration")
Signed-off-by: Henry Burns <henryburns@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Vitaly Wool <vitalywool@gmail.com>
Cc: Vitaly Vul <vitaly.vul@sony.com>
Cc: Jonathan Adams <jwadams@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Snild Dolkow <snild@sony.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/z3fold.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/mm/z3fold.c b/mm/z3fold.c index e13c6228cd70..70008a8fed95 100644 --- a/mm/z3fold.c +++ b/mm/z3fold.c @@ -1350,16 +1350,11 @@ static int z3fold_page_migrate(struct address_space *mapping, struct page *newpa zhdr = page_address(page); pool = zhdr_to_pool(zhdr); - if (!trylock_page(page)) - return -EAGAIN; - if (!z3fold_page_trylock(zhdr)) { - unlock_page(page); return -EAGAIN; } if (zhdr->mapped_count != 0) { z3fold_page_unlock(zhdr); - unlock_page(page); return -EBUSY; } new_zhdr = page_address(newpage); @@ -1391,7 +1386,6 @@ static int z3fold_page_migrate(struct address_space *mapping, struct page *newpa queue_work_on(new_zhdr->cpu, pool->compact_wq, &new_zhdr->work); page_mapcount_reset(page); - unlock_page(page); put_page(page); return 0; } |