diff options
Diffstat (limited to 'debian/patches-rt/0292-x86-preempt-Check-preemption-level-before-looking-at.patch')
| -rw-r--r-- | debian/patches-rt/0292-x86-preempt-Check-preemption-level-before-looking-at.patch | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/debian/patches-rt/0292-x86-preempt-Check-preemption-level-before-looking-at.patch b/debian/patches-rt/0292-x86-preempt-Check-preemption-level-before-looking-at.patch new file mode 100644 index 000000000..df53f3dd7 --- /dev/null +++ b/debian/patches-rt/0292-x86-preempt-Check-preemption-level-before-looking-at.patch @@ -0,0 +1,34 @@ +From 3a7e827c42b01480e35997bdc722eaaa457840d1 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Wed, 14 Aug 2019 17:08:58 +0200 +Subject: [PATCH 292/347] x86: preempt: Check preemption level before looking + at lazy-preempt +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +[ Upstream commit 19fc8557f2323c52b26561651ed4d51fc688a740 ] + +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> +Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> +--- + arch/x86/include/asm/preempt.h | 2 ++ + 1 file changed, 2 insertions(+) + +diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h +index f66708779274..afa0e42ccdd1 100644 +--- a/arch/x86/include/asm/preempt.h ++++ b/arch/x86/include/asm/preempt.h +@@ -96,6 +96,8 @@ static __always_inline bool __preempt_count_dec_and_test(void) + if (____preempt_count_dec_and_test()) + return true; + #ifdef CONFIG_PREEMPT_LAZY ++ if (preempt_count()) ++ return false; + if (current_thread_info()->preempt_lazy_count) + return false; + return test_thread_flag(TIF_NEED_RESCHED_LAZY); +-- +2.36.1 + |