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-rw-r--r--debian/patches-rt/0264-jump-label-disable-if-stop_machine-is-used.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/debian/patches-rt/0264-jump-label-disable-if-stop_machine-is-used.patch b/debian/patches-rt/0264-jump-label-disable-if-stop_machine-is-used.patch
new file mode 100644
index 000000000..168745160
--- /dev/null
+++ b/debian/patches-rt/0264-jump-label-disable-if-stop_machine-is-used.patch
@@ -0,0 +1,42 @@
+From 915e18f01ac0c97a6dc374b940a96a105bf57c62 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Wed, 8 Jul 2015 17:14:48 +0200
+Subject: [PATCH 264/323] jump-label: disable if stop_machine() is used
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.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(-)
+
+diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
+index ee2cbe8ad502..73c55cb2f296 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_MMAP_RND_BITS if MMU
+ select HAVE_ARCH_SECCOMP
+--
+2.43.0
+