linux-kernel - [PATCH v8 loongarch-next 3/3] LoongArch: Enable 128-bit atomics cmpxchg support

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Message-ID: <20251231034523.47014-4-dongtai.guo@linux.dev>
Date: Wed, 31 Dec 2025 11:45:23 +0800
From: George Guo <dongtai.guo@...ux.dev>
To: hengqi.chen@...il.com
Cc: chenhuacai@...nel.org,
	dongtai.guo@...ux.dev,
	guodongtai@...inos.cn,
	kernel@...0n.name,
	lianyangyang@...inos.cn,
	linux-kernel@...r.kernel.org,
	loongarch@...ts.linux.dev,
	r@....cc,
	xry111@...111.site
Subject: [PATCH v8 loongarch-next 3/3] LoongArch: Enable 128-bit atomics cmpxchg support

From: George Guo <guodongtai@...inos.cn>

Add select HAVE_CMPXCHG_DOUBLE and select HAVE_ALIGNED_STRUCT_PAGE in Kconfig
to enable 128-bit atomic cmpxchg support on LoongArch.

Signed-off-by: George Guo <guodongtai@...inos.cn>
---
 arch/loongarch/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 730f34214519..f9845ebec1a4 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -114,6 +114,7 @@ config LOONGARCH
 	select GENERIC_TIME_VSYSCALL
 	select GPIOLIB
 	select HAS_IOPORT
+	select HAVE_ALIGNED_STRUCT_PAGE
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_BITREVERSE
 	select HAVE_ARCH_JUMP_LABEL
@@ -130,6 +131,7 @@ config LOONGARCH
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
 	select HAVE_ASM_MODVERSIONS
+	select HAVE_CMPXCHG_DOUBLE
 	select HAVE_CONTEXT_TRACKING_USER
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_DEBUG_KMEMLEAK
-- 
2.49.0