46 lines
1.7 KiB
Diff
46 lines
1.7 KiB
Diff
From 14aff7b583613ece34543f3458216a94c1a0df0c Mon Sep 17 00:00:00 2001
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Message-Id: <14aff7b583613ece34543f3458216a94c1a0df0c.1596234183.git.zanussi@kernel.org>
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In-Reply-To: <378ee68279f6a7631221f2670a9298620148690d.1596234183.git.zanussi@kernel.org>
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References: <378ee68279f6a7631221f2670a9298620148690d.1596234183.git.zanussi@kernel.org>
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Wed, 8 Jul 2015 17:14:48 +0200
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Subject: [PATCH 038/329] jump-label: disable if stop_machine() is used
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.135-rt60.tar.xz
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Some architectures are using stop_machine() while switching the opcode which
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leads to latency spikes.
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The architectures which use stop_machine() atm:
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- ARM stop machine
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- s390 stop machine
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The architecures which use other sorcery:
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- MIPS
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- X86
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- powerpc
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- sparc
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- arm64
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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[bigeasy: only ARM for now]
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/arm/Kconfig | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
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index e2f7c50dbace..91ba9fe945ff 100644
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--- a/arch/arm/Kconfig
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+++ b/arch/arm/Kconfig
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@@ -51,7 +51,7 @@ config ARM
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select HARDIRQS_SW_RESEND
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select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
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select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
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- select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
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+ select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU && !PREEMPT_RT_BASE
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select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
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select HAVE_ARCH_MMAP_RND_BITS if MMU
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select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
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--
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2.17.1
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