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| author | Thomas Gleixner <[email protected]> | 2021-08-15 21:29:20 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2021-08-17 17:06:02 +0000 |
| commit | 51711e825a6d1b2fe7ca46bb06d08c25d97656ee (patch) | |
| tree | ffbfd0a341e7715922ad5ce909d5754b8efb5d6c /lib/string_helpers.c | |
| parent | futex: Prevent requeue_pi() lock nesting issue on RT (diff) | |
| download | kernel-51711e825a6d1b2fe7ca46bb06d08c25d97656ee.tar.gz kernel-51711e825a6d1b2fe7ca46bb06d08c25d97656ee.zip | |
locking/rtmutex: Prevent lockdep false positive with PI futexes
On PREEMPT_RT the futex hashbucket spinlock becomes 'sleeping' and rtmutex
based. That causes a lockdep false positive because some of the futex
functions invoke spin_unlock(&hb->lock) with the wait_lock of the rtmutex
associated to the pi_futex held. spin_unlock() in turn takes wait_lock of
the rtmutex on which the spinlock is based which makes lockdep notice a
lock recursion.
Give the futex/rtmutex wait_lock a separate key.
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'lib/string_helpers.c')
0 files changed, 0 insertions, 0 deletions