From: Jiaxun Yang <jiaxun.yang@flygoat.com>
Date: Wed, 12 Jun 2024 08:54:30 +0000 (+0100)
Subject: MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT
X-Git-Tag: v6.11-rc1~95^2~24
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=426fa8e4fe7bb914b5977cbce453a9926bf5b2e6;p=thirdparty%2Fkernel%2Flinux.git

MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT

csrc-r4k suffers from SMP synchronization overhead.

Select HAVE_UNSTABLE_SCHED_CLOCK to workaround drift
between the CPUs on the system. HAVE_UNSTABLE_SCHED_CLOCK
requires cmpxchg64, so enable it for 64 bits only.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1236ea1220612..c14192514e9db 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1084,6 +1084,7 @@ config CSRC_IOASIC
 
 config CSRC_R4K
 	select CLOCKSOURCE_WATCHDOG if CPU_FREQ
+	select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT
 	bool
 
 config CSRC_SB1250