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[v2,3/7] MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT

Message ID 20240612-mips-clks-v2-3-a57e6f49f3db@flygoat.com (mailing list archive)
State Accepted
Commit 426fa8e4fe7bb914b5977cbce453a9926bf5b2e6
Headers show
Series MIPS: clocksource cumulative enhancements | expand

Commit Message

Jiaxun Yang June 12, 2024, 8:54 a.m. UTC 
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>
---
v2: Depends on SMP as well
---
 arch/mips/Kconfig | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index f1aa1bf11166..656df5d4097d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1083,6 +1083,7 @@  config CSRC_IOASIC
 
 config CSRC_R4K
 	select CLOCKSOURCE_WATCHDOG if CPU_FREQ
+	select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT
 	bool
 
 config CSRC_SB1250