From 0d2be10b3037c12d68003856b8d6c83d1b80e0c9 Mon Sep 17 00:00:00 2001 From: Andrew Halaney Date: Thu, 24 Feb 2022 15:23:12 -0600 Subject: [PATCH] Documentation/locking/locktypes: Fix PREEMPT_RT _bh() description With PREEMPT_RT the _bh() version of a spinlock leaves preemption enabled, align the doc to say that instead of the opposite. Reported-by: Leah Leshchinsky Signed-off-by: Andrew Halaney Reviewed-by: Boqun Feng Link: https://lore.kernel.org/r/20220224212312.2601153-1-ahalaney@redhat.com Signed-off-by: Jonathan Corbet --- Documentation/locking/locktypes.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/locking/locktypes.rst b/Documentation/locking/locktypes.rst index 4fd7b70..bfa75ea 100644 --- a/Documentation/locking/locktypes.rst +++ b/Documentation/locking/locktypes.rst @@ -247,7 +247,7 @@ based on rt_mutex which changes the semantics: Non-PREEMPT_RT kernels disable preemption to get this effect. PREEMPT_RT kernels use a per-CPU lock for serialization which keeps - preemption disabled. The lock disables softirq handlers and also + preemption enabled. The lock disables softirq handlers and also prevents reentrancy due to task preemption. PREEMPT_RT kernels preserve all other spinlock_t semantics: -- 2.7.4