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locking/lockdep: Add new check to lock_downgrade()

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  f8319483f5 ("locking/lockdep: Provide a type check for lock_is_held")

didn't fully cover rwsems as downgrade_write() was left out.

Introduce lock_downgrade() and use it to add new checks.

See-also: http://marc.info/?l=linux-kernel&m=148581164003149&w=2
Originally-written-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1486053497-9948-3-git-send-email-hooanon05g@gmail.com
[ Rewrote the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
J. R. Okajima
2017-02-03 01:38:17 +09:00
committed by Ingo Molnar
parent e969970be0
commit 6419c4af77
3 changed files with 60 additions and 4 deletions
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6
kernel/locking/rwsem.c
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@@ -124,10 +124,8 @@ EXPORT_SYMBOL(up_write);
*/
void downgrade_write(struct rw_semaphore *sem)
{
/*
* lockdep: a downgraded write will live on as a write
* dependency.
*/
lock_downgrade(&sem->dep_map, _RET_IP_);
rwsem_set_reader_owned(sem);
__downgrade_write(sem);
}