From: NeilBrown Date: Tue, 29 Aug 2017 22:10:18 +0000 (+1000) Subject: dm io: remove BIOSET_NEED_RESCUER flag from bios bioset X-Git-Tag: v4.16-rc1~141^2~50 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=c110a4b6e603ece6134fe436e84957f7a4cd099e;p=linux.git dm io: remove BIOSET_NEED_RESCUER flag from bios bioset The BIOSET_NEED_RESCUER flag is only needed when a make_request_fn might do two allocations from the one bioset, and the second one could block until the first bio completes. dm_io() is called from make_request_fn() context. The closest it comes to multiple allocations is in chunk_io() in dm-snap-persistent. But there the code uses a separate thread to avoid problems. So BIOSET_NEED_RESCUER is not needed. Signed-off-by: NeilBrown Signed-off-by: Mike Snitzer --- diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index b4357ed4d541..a8d914d5abbe 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -58,8 +58,7 @@ struct dm_io_client *dm_io_client_create(void) if (!client->pool) goto bad; - client->bios = bioset_create(min_ios, 0, (BIOSET_NEED_BVECS | - BIOSET_NEED_RESCUER)); + client->bios = bioset_create(min_ios, 0, BIOSET_NEED_BVECS); if (!client->bios) goto bad;