2020-10-12 12:52:06 +00:00
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From 148cdab3ace63f2ec560f4aa496a0910e85cac12 Mon Sep 17 00:00:00 2001
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Message-Id: <148cdab3ace63f2ec560f4aa496a0910e85cac12.1601675152.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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2019-02-27 18:51:46 +00:00
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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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2020-09-04 20:10:21 +00:00
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Subject: [PATCH 240/333] x86: lazy-preempt: properly check against
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2019-04-08 23:49:20 +00:00
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preempt-mask
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2020-10-12 12:52:06 +00:00
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
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2019-02-27 18:51:46 +00:00
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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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2019-04-08 23:49:20 +00:00
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arch/x86/include/asm/preempt.h | 2 +-
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2019-02-27 18:51:46 +00:00
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1 file changed, 1 insertion(+), 1 deletion(-)
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2019-04-08 23:49:20 +00:00
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diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h
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index 22992c837795..f66708779274 100644
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2019-02-27 18:51:46 +00:00
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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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2019-04-08 23:49:20 +00:00
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@@ -118,7 +118,7 @@ static __always_inline bool should_resched(int preempt_offset)
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2019-02-27 18:51:46 +00:00
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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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2020-01-03 23:36:11 +00:00
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--
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2020-06-22 13:14:16 +00:00
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2.17.1
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2020-01-03 23:36:11 +00:00
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