rwsem: Implement down_read_killable_nested

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[ Upstream commit 0f9368b5bf ]

In preparation for converting exec_update_mutex to a rwsem so that
multiple readers can execute in parallel and not deadlock, add
down_read_killable_nested.  This is needed so that kcmp_lock
can be converted from working on a mutexes to working on rw_semaphores.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/87o8jabqh3.fsf@x220.int.ebiederm.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Eric W. Biederman 2020-12-03 14:10:32 -06:00 • committed by Greg Kroah-Hartman

parent 2cded5a3cc

commit 27bae39e4f

2 changed files with 16 additions and 0 deletions

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2

include/linux/rwsem.h

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14

kernel/locking/rwsem.c

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