diff options
Diffstat (limited to 'features/rt/jump-label-disable-if-stop_machine-is-used.patch')
| -rw-r--r-- | features/rt/jump-label-disable-if-stop_machine-is-used.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/features/rt/jump-label-disable-if-stop_machine-is-used.patch b/features/rt/jump-label-disable-if-stop_machine-is-used.patch new file mode 100644 index 00000000..7ed59db6 --- /dev/null +++ b/features/rt/jump-label-disable-if-stop_machine-is-used.patch @@ -0,0 +1,41 @@ +From 14fd102dd9a45ac6a7e986617ed27fcdcd6f860f Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Wed, 8 Jul 2015 17:14:48 +0200 +Subject: [PATCH 169/191] jump-label: disable if stop_machine() is used + +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(-) + +diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig +index 5179eb3a35d5..fe49c7cb76bd 100644 +--- a/arch/arm/Kconfig ++++ b/arch/arm/Kconfig +@@ -67,7 +67,7 @@ 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 + select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU + select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL + select HAVE_ARCH_MMAP_RND_BITS if MMU +-- +2.19.1 + |