37 lines
1.2 KiB
Diff
37 lines
1.2 KiB
Diff
Subject: jump-label: disable if stop_machine() is used
|
|
From: Thomas Gleixner <tglx@linutronix.de>
|
|
Date: Wed, 08 Jul 2015 17:14:48 +0200
|
|
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.1-rt3.tar.xz
|
|
|
|
Some architectures are using stop_machine() while switching the opcode which
|
|
leads to latency spikes.
|
|
The architectures which use stop_machine() atm:
|
|
- ARM stop machine
|
|
- s390 stop machine
|
|
|
|
The architecures which use other sorcery:
|
|
- MIPS
|
|
- X86
|
|
- powerpc
|
|
- sparc
|
|
- arm64
|
|
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
|
[bigeasy: only ARM for now]
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
---
|
|
arch/arm/Kconfig | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
--- a/arch/arm/Kconfig
|
|
+++ b/arch/arm/Kconfig
|
|
@@ -51,7 +51,7 @@ config ARM
|
|
select HARDIRQS_SW_RESEND
|
|
select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
|
|
select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
|
|
- select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
|
|
+ select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU && !PREEMPT_RT_BASE
|
|
select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
|
|
select HAVE_ARCH_MMAP_RND_BITS if MMU
|
|
select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
|