LoongArch: Select HAVE_CMPXCHG_LOCAL in Kconfig

LoongArch has already implemented cmpxchg_local(), this_cpu_cmpxchg()
and similar functions, so select HAVE_CMPXCHG_LOCAL in Kconfig to avoid
incurring the overhead of local_irq_save()/local_irq_restore() for page
state helpers in mm/vmstat.c.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 730f342145197f328d065a2569ab0ce2dc99645c..ae9d954aa0525544811b83b24e6825b850cdbfd4 100644 (file)
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -130,6 +130,7 @@ config LOONGARCH
        select HAVE_ARCH_TRANSPARENT_HUGEPAGE
        select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
        select HAVE_ASM_MODVERSIONS
+       select HAVE_CMPXCHG_LOCAL
        select HAVE_CONTEXT_TRACKING_USER
        select HAVE_C_RECORDMCOUNT
        select HAVE_DEBUG_KMEMLEAK