[tip: locking/core] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86

[tip-bot2 for Boqun Feng]

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     cf4c3bc1445152c1949a4b5fef56d07579fadb1e
Gitweb:        https://git.kernel.org/tip/cf4c3bc1445152c1949a4b5fef56d07579fadb1e
Author:        Boqun Feng <boqun.feng@xxxxxxxxx>
AuthorDate:    Tue, 06 Jan 2026 11:40:34 +08:00
Committer:     Boqun Feng <boqun.feng@xxxxxxxxx>
CommitterDate: Fri, 09 Jan 2026 19:01:41 +08:00

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@xxxxxxxxx>
Acked-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
Link: https://patch.msgid.link/20260106034034.60074-1-boqun.feng@xxxxxxxxx
---
 arch/x86/um/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index bdd7c8e..44b12e4 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