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

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Message-ID: <aV3SFWYUbN5t9LiW@tardis-2.local>
Date: Wed, 7 Jan 2026 11:26:21 +0800
From: Boqun Feng <boqun.feng@...il.com>
To: Richard Weinberger <richard@....at>
Cc: linux-um <linux-um@...ts.infradead.org>, x86 <x86@...nel.org>,
	anton ivanov <anton.ivanov@...bridgegreys.com>,
	Johannes Berg <johannes@...solutions.net>,
	tglx <tglx@...utronix.de>, mingo <mingo@...hat.com>,
	bp <bp@...en8.de>, dave hansen <dave.hansen@...ux.intel.com>,
	hpa <hpa@...or.com>, Miguel Ojeda <ojeda@...nel.org>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	dakr <dakr@...nel.org>, linux-kernel <linux-kernel@...r.kernel.org>,
	Rust for Linux Kernel <rust-for-linux@...r.kernel.org>,
	FUJITA Tomonori <fujita.tomonori@...il.com>
Subject: Re: [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86

On Tue, Jan 06, 2026 at 03:20:43PM +0100, Richard Weinberger wrote:
> ----- Ursprüngliche Mail -----
> > Von: "Boqun Feng" <boqun.feng@...il.com>
> > An: "linux-um" <linux-um@...ts.infradead.org>, "x86" <x86@...nel.org>
> > CC: "richard" <richard@....at>, "anton ivanov" <anton.ivanov@...bridgegreys.com>, "Johannes Berg"
> > <johannes@...solutions.net>, "tglx" <tglx@...utronix.de>, "mingo" <mingo@...hat.com>, "bp" <bp@...en8.de>, "dave
> > hansen" <dave.hansen@...ux.intel.com>, "hpa" <hpa@...or.com>, "Miguel Ojeda" <ojeda@...nel.org>, "Boqun Feng"
> > <boqun.feng@...il.com>, "Gary Guo" <gary@...yguo.net>, "Björn Roy Baron" <bjorn3_gh@...tonmail.com>, "Benno Lossin"
> > <lossin@...nel.org>, "Andreas Hindborg" <a.hindborg@...nel.org>, "Alice Ryhl" <aliceryhl@...gle.com>, "Trevor Gross"
> > <tmgross@...ch.edu>, "dakr" <dakr@...nel.org>, "linux-kernel" <linux-kernel@...r.kernel.org>, "Rust for Linux Kernel"
> > <rust-for-linux@...r.kernel.org>, "FUJITA Tomonori" <fujita.tomonori@...il.com>
> > Gesendet: Dienstag, 6. Januar 2026 04:40:34
> > Betreff: [PATCH] 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.
> > 
> > Signed-off-by: Boqun Feng <boqun.feng@...il.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(+)
> 
> Acked-by: Richard Weinberger <richard@....at>
> 

Queued with both tags applied, thank you both!

Regards,
Boqun

> Thanks,
> //richard