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

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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>

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Christophe Leroy 2022-01-14 14:05:13 -08:00 • committed by Linus Torvalds

parent 43b9312105

commit 677b2a8c1f

1 changed files with 10 additions and 8 deletions

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mm/gup.c

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