27 lines
952 B
Diff
27 lines
952 B
Diff
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Mon, 18 Feb 2019 16:57:09 +0100
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Subject: [PATCH] x86: lazy-preempt: properly check against preempt-mask
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.25-rt16.tar.xz
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should_resched() should check against preempt_offset after unmasking the
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need-resched-bit. Otherwise should_resched() won't work for
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preempt_offset != 0 and lazy-preempt set.
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Cc: stable-rt@vger.kernel.org
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/x86/include/asm/preempt.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/arch/x86/include/asm/preempt.h
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+++ b/arch/x86/include/asm/preempt.h
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@@ -118,7 +118,7 @@ static __always_inline bool should_resch
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/* preempt count == 0 ? */
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tmp &= ~PREEMPT_NEED_RESCHED;
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- if (tmp)
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+ if (tmp != preempt_offset)
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return false;
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if (current_thread_info()->preempt_lazy_count)
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return false;
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