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@gmail.com>
Acked-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20260106034034.60074-1-boqun.feng@gmail.com

diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index bdd7c8e39b011708423847d93f67d1f17fdd447a..44b12e45f9a058bb06d2c628168d21e961aa3943 100644 (file)
--- 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