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

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Message-ID: <1064740857.79527.1767709243348.JavaMail.zimbra@nod.at>
Date: Tue, 6 Jan 2026 15:20:43 +0100 (CET)
From: Richard Weinberger <richard@....at>
To: Boqun Feng <boqun.feng@...il.com>
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

----- 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>

Thanks,
//richard