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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-05-12 10:44:43 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-05-19 16:51:21 +0300 |
| commit | b1fcf9b83c4149c63d1e0c699e85f93cbe28e211 (patch) | |
| tree | 39a5dc1ef4133da88b638dd6b432d0c8d85d51cb /include/linux/rcutree.h | |
| parent | 8ae0ae6737ad449c8ae21e2bb01d9736f360a933 (diff) | |
| download | linux-b1fcf9b83c4149c63d1e0c699e85f93cbe28e211.tar.xz | |
rcu: Provide __rcu_is_watching()
Same as rcu_is_watching() but without the preempt_disable/enable() pair
inside the function. It is merked noinstr so it ends up in the
non-instrumentable text section.
This is useful for non-preemptible code especially in the low level entry
section. Using rcu_is_watching() there results in a call to the
preempt_schedule_notrace() thunk which triggers noinstr section warnings in
objtool.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200512213810.518709291@linutronix.de
Diffstat (limited to 'include/linux/rcutree.h')
| -rw-r--r-- | include/linux/rcutree.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h index 02016e0aa8eb..9366fa4d0717 100644 --- a/include/linux/rcutree.h +++ b/include/linux/rcutree.h @@ -58,6 +58,7 @@ extern int rcu_scheduler_active __read_mostly; void rcu_end_inkernel_boot(void); bool rcu_inkernel_boot_has_ended(void); bool rcu_is_watching(void); +bool __rcu_is_watching(void); #ifndef CONFIG_PREEMPTION void rcu_all_qs(void); #endif |