[PATCH v9 3/3] riscv: select HAVE_CMPXCHG_LOCAL

[Yunhui Cui <cuiyunhui@bytedance.com>]

Now that RISC-V provides this_cpu_cmpxchg(), select
HAVE_CMPXCHG_LOCAL so mm/vmstat.c and lib/percpu_counter.c can use
this_cpu_try_cmpxchg() instead of serializing per-CPU counter updates
with local_irq_save() and local_irq_restore().

Suggested-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://lore.kernel.org/r/20260826010748.zphu3wh2hlm4t4o2@offworld
Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com>
---
 arch/riscv/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index bde1f1885038f..458ef01e926a4 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -155,6 +155,7 @@ config RISCV
 	select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
 	select HAVE_ASM_MODVERSIONS
 	select HAVE_BUILDTIME_MCOUNT_SORT
+	select HAVE_CMPXCHG_LOCAL
 	select HAVE_CONTEXT_TRACKING_USER
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DMA_CONTIGUOUS if MMU
-- 
2.39.5