From: Boqun Feng <boqun.feng@gmail.com>
To: linux-um@lists.infradead.org, x86@kernel.org
Cc: "Richard Weinberger" <richard@nod.at>,
"Anton Ivanov" <anton.ivanov@cambridgegreys.com>,
"Johannes Berg" <johannes@sipsolutions.net>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
"FUJITA Tomonori" <fujita.tomonori@gmail.com>
Subject: [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86
Date: Tue, 6 Jan 2026 11:40:34 +0800 [thread overview]
Message-ID: <20260106034034.60074-1-boqun.feng@gmail.com> (raw)
In-Reply-To: <aVxcAZe6AEXEfx3G@tardis-2.local>
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.
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
---
UM & x86 maintainers,
I need this to avoid a build error for Rust atomics since Rust currently
only support Atomic<i8/i16> on ARCH_SUPPORTS_ATOMIC_RMW archs. I will
add it to my upcoming PR if I get some Acked-by, thanks!
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
next parent reply other threads:[~2026-01-06 3:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <aVxcAZe6AEXEfx3G@tardis-2.local>
2026-01-06 3:40 ` Boqun Feng [this message]
2026-01-06 13:30 ` [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 FUJITA Tomonori
2026-01-06 14:20 ` Richard Weinberger
2026-01-07 3:26 ` Boqun Feng
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