tree 663d5a0a7a5fade5b9edaeb0c7ef16fd320b0d23
parent 43b93121056c524e2af77d561900ea856d32029c
author Christophe Leroy <christophe.leroy@csgroup.eu> 1642197913 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1642257026 +0200

gup: avoid multiple user access locking/unlocking in fault_in_{read/write}able

fault_in_readable() and fault_in_writeable() perform __get_user() and
__put_user() in a loop, implying multiple user access locking/unlocking.

To avoid that, use user access blocks.

Link: https://lkml.kernel.org/r/720dcf79314acca1a78fae56d478cc851952149d.1637084492.git.christophe.leroy@csgroup.eu
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>