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| author |   Thomas Gleixner <tglx@linutronix.de> | 2021-08-15 23:29:22 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2021-08-17 19:06:04 +0200 |
| commit | 015680aa4c5d784513d0a9728bc52ec7c4a64227 (patch) | |
| tree | 6f5b9ad1845d01293a6780e7fcfef57487a7d3ab /include/linux/preempt.h | |
| parent | locking/rtmutex: Prevent lockdep false positive with PI futexes (diff) | |
| download | wireguard-linux-015680aa4c5d784513d0a9728bc52ec7c4a64227.tar.xz wireguard-linux-015680aa4c5d784513d0a9728bc52ec7c4a64227.zip | |
preempt: Adjust PREEMPT_LOCK_OFFSET for RT
On PREEMPT_RT regular spinlocks and rwlocks are substituted with rtmutex
based constructs. spin/rwlock held regions are preemptible on PREEMPT_RT,
so PREEMPT_LOCK_OFFSET has to be 0 to make the various cond_resched_*lock()
functions work correctly.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211305.804246275@linutronix.de
Diffstat (limited to 'include/linux/preempt.h')
| -rw-r--r-- | include/linux/preempt.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/preempt.h b/include/linux/preempt.h index 9881eac0698f..4d244e295e85 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -121,7 +121,11 @@ /* * The preempt_count offset after spin_lock() */ +#if !defined(CONFIG_PREEMPT_RT) #define PREEMPT_LOCK_OFFSET PREEMPT_DISABLE_OFFSET +#else +#define PREEMPT_LOCK_OFFSET 0 +#endif /* * The preempt_count offset needed for things like: |