| Subject: jump-label: disable if stop_machine() is used |
| From: Thomas Gleixner <tglx@linutronix.de> |
| Date: Wed, 08 Jul 2015 17:14:48 +0200 |
| |
| 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 |
| @@ -35,7 +35,7 @@ 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) |
