linux-kernel - [PATCH] LoongArch: Select HAVE_CMPXCHG

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Message-ID: <20251223081228.3367509-1-chenhuacai@loongson.cn>
Date: Tue, 23 Dec 2025 16:12:28 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH] 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@...ngson.cn>
---
 arch/loongarch/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 730f34214519..ae9d954aa052 100644
--- 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
-- 
2.47.3