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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 14 Aug 2019 17:08:58 +0200
Subject: [PATCH] arm64: preempt: Check preemption level before looking at
lazy-preempt
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.9-rt3.tar.xz
Before evaluating the lazy-preempt state it must be ensure that the
preempt-count is zero.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/arm64/include/asm/preempt.h | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/arm64/include/asm/preempt.h
+++ b/arch/arm64/include/asm/preempt.h
@@ -73,6 +73,8 @@ static inline bool __preempt_count_dec_a
if (!pc || !READ_ONCE(ti->preempt_count))
return true;
#ifdef CONFIG_PREEMPT_LAZY
+ if ((pc & ~PREEMPT_NEED_RESCHED))
+ return false;
if (current_thread_info()->preempt_lazy_count)
return false;
return test_thread_flag(TIF_NEED_RESCHED_LAZY);
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