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 1236ea1220612e985ddb264da9af5fd47bebb269..c14192514e9dbeaf5d07d8eed7482dc170afa920 100644 (file)
--- 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