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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-05-05 21:56:55 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-05-05 21:56:55 +0200 |
| commit | b115d85a9584c98f9a7dec209d835462aa1adc09 (patch) | |
| tree | 332af6e2fafef47b9dc9891282b422eb5dcc5f3f /kernel | |
| parent | Merge branch 'x86-uaccess-cleanup': x86 uaccess header cleanups (diff) | |
| parent | locking/atomic: Correct (cmp)xchg() instrumentation (diff) | |
| download | linux-b115d85a9584c98f9a7dec209d835462aa1adc09.tar.xz linux-b115d85a9584c98f9a7dec209d835462aa1adc09.zip | |
Merge tag 'locking-core-2023-05-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
- Introduce local{,64}_try_cmpxchg() - a slightly more optimal
primitive, which will be used in perf events ring-buffer code
- Simplify/modify rwsems on PREEMPT_RT, to address writer starvation
- Misc cleanups/fixes
* tag 'locking-core-2023-05-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/atomic: Correct (cmp)xchg() instrumentation
locking/x86: Define arch_try_cmpxchg_local()
locking/arch: Wire up local_try_cmpxchg()
locking/generic: Wire up local{,64}_try_cmpxchg()
locking/atomic: Add generic try_cmpxchg{,64}_local() support
locking/rwbase: Mitigate indefinite writer starvation
locking/arch: Rename all internal __xchg() names to __arch_xchg()
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/locking/rwbase_rt.c | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/kernel/locking/rwbase_rt.c b/kernel/locking/rwbase_rt.c index c201aadb9301..25ec0239477c 100644 --- a/kernel/locking/rwbase_rt.c +++ b/kernel/locking/rwbase_rt.c @@ -72,15 +72,6 @@ static int __sched __rwbase_read_lock(struct rwbase_rt *rwb, int ret; raw_spin_lock_irq(&rtm->wait_lock); - /* - * Allow readers, as long as the writer has not completely - * acquired the semaphore for write. - */ - if (atomic_read(&rwb->readers) != WRITER_BIAS) { - atomic_inc(&rwb->readers); - raw_spin_unlock_irq(&rtm->wait_lock); - return 0; - } /* * Call into the slow lock path with the rtmutex->wait_lock |