The patch titled Subject: dm bufio: fully initialize shrinker has been removed from the -mm tree. Its filename was dm-bufio-fully-initialize-shrinker.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Greg Thelen <gthelen@xxxxxxxxxx> Subject: dm bufio: fully initialize shrinker 1d3d4437eae1 ("vmscan: per-node deferred work") added a flags field to struct shrinker assuming that all shrinkers were zero filled. The dm bufio shrinker is not zero filled, which leaves arbitrary kmalloc() data in flags. So far the only defined flags bit is SHRINKER_NUMA_AWARE. But there are proposed patches which add other bits to shrinker.flags (e.g. memcg awareness). Rather than simply initializing the shrinker, this patch uses kzalloc() when allocating the dm_bufio_client to ensure that the embedded shrinker and any other similar structures are zeroed. This fixes theoretical over aggressive shrinking of dm bufio objects. If the uninitialized dm_bufio_client.shrinker.flags contains SHRINKER_NUMA_AWARE then shrink_slab() would call the dm shrinker for each numa node rather than just once. This has been broken since 3.12. Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx> Cc: Alasdair Kergon <agk@xxxxxxxxxx> Cc: Mike Snitzer <snitzer@xxxxxxxxxx> Cc: Neil Brown <neilb@xxxxxxx> Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> Cc: Dave Chinner <dchinner@xxxxxxxxxx> Acked-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> [3.12+] Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/md/dm-bufio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/md/dm-bufio.c~dm-bufio-fully-initialize-shrinker drivers/md/dm-bufio.c --- a/drivers/md/dm-bufio.c~dm-bufio-fully-initialize-shrinker +++ a/drivers/md/dm-bufio.c @@ -1541,7 +1541,7 @@ struct dm_bufio_client *dm_bufio_client_ BUG_ON(block_size < 1 << SECTOR_SHIFT || (block_size & (block_size - 1))); - c = kmalloc(sizeof(*c), GFP_KERNEL); + c = kzalloc(sizeof(*c), GFP_KERNEL); if (!c) { r = -ENOMEM; goto bad_client; _ Patches currently in -mm which might be from gthelen@xxxxxxxxxx are memcg-remove-lookup_cgroup_page-prototype.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html