linux-kernel - [PATCH 16/36] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML

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Message-ID: <20260111120209.6133-14-boqun.feng@gmail.com>
Date: Sun, 11 Jan 2026 20:01:49 +0800
From: Boqun Feng <boqun.feng@...il.com>
To: "Peter Zijlstra" <peterz@...radead.org>,
	"Ingo Molnar" <mingo@...nel.org>
Cc: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Will Deacon" <will@...nel.org>,
	"Mark Rutland" <mark.rutland@....com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Miguel Ojeda" <ojeda@...nel.org>,
	"Gary Guo" <gary@...yguo.net>,
	"Alice Ryhl" <aliceryhl@...gle.com>,
	"Andreas Hindborg" <a.hindborg@...nel.org>,
	"Benno Lossin" <lossin@...nel.org>,
	"Danilo Krummrich" <dakr@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	FUJITA Tomonori <fujita.tomonori@...il.com>,
	Richard Weinberger <richard@....at>
Subject: [PATCH 16/36] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86

x86 atomic instructions are used for um on UML_X86, therefore atomics
on UML_X86 support native atomic RmW as x86 does, hence select
ARCH_SUPPORTS_ATOMIC_RMW.

Reviewed-by: FUJITA Tomonori <fujita.tomonori@...il.com>
Acked-by: Richard Weinberger <richard@....at>
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Link: https://patch.msgid.link/20260106034034.60074-1-boqun.feng@gmail.com
---
 arch/x86/um/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index bdd7c8e39b01..44b12e45f9a0 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -9,6 +9,7 @@ endmenu
 config UML_X86
 	def_bool y
 	select ARCH_USE_QUEUED_RWLOCKS
+	select ARCH_SUPPORTS_ATOMIC_RMW
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select DCACHE_WORD_ACCESS
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
-- 
2.51.0