* [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 [not found] <aVxcAZe6AEXEfx3G@tardis-2.local> @ 2026-01-06 3:40 ` Boqun Feng 2026-01-06 13:30 ` FUJITA Tomonori 2026-01-06 14:20 ` Richard Weinberger 0 siblings, 2 replies; 4+ messages in thread From: Boqun Feng @ 2026-01-06 3:40 UTC (permalink / raw) To: linux-um, x86 Cc: Richard Weinberger, Anton Ivanov, Johannes Berg, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, H. Peter Anvin, Miguel Ojeda, Boqun Feng, Gary Guo, Björn Roy Baron, Benno Lossin, Andreas Hindborg, Alice Ryhl, Trevor Gross, Danilo Krummrich, linux-kernel, rust-for-linux, FUJITA Tomonori 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 ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 2026-01-06 3:40 ` [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 Boqun Feng @ 2026-01-06 13:30 ` FUJITA Tomonori 2026-01-06 14:20 ` Richard Weinberger 1 sibling, 0 replies; 4+ messages in thread From: FUJITA Tomonori @ 2026-01-06 13:30 UTC (permalink / raw) To: boqun.feng Cc: linux-um, x86, richard, anton.ivanov, johannes, tglx, mingo, bp, dave.hansen, hpa, ojeda, gary, bjorn3_gh, lossin, a.hindborg, aliceryhl, tmgross, dakr, linux-kernel, rust-for-linux, fujita.tomonori On Tue, 6 Jan 2026 11:40:34 +0800 Boqun Feng <boqun.feng@gmail.com> wrote: > 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> Reviewed-by: FUJITA Tomonori <fujita.tomonori@gmail.com> ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 2026-01-06 3:40 ` [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 Boqun Feng 2026-01-06 13:30 ` FUJITA Tomonori @ 2026-01-06 14:20 ` Richard Weinberger 2026-01-07 3:26 ` Boqun Feng 1 sibling, 1 reply; 4+ messages in thread From: Richard Weinberger @ 2026-01-06 14:20 UTC (permalink / raw) To: Boqun Feng Cc: linux-um, x86, anton ivanov, Johannes Berg, tglx, mingo, bp, dave hansen, hpa, Miguel Ojeda, Gary Guo, Björn Roy Baron, Benno Lossin, Andreas Hindborg, Alice Ryhl, Trevor Gross, dakr, linux-kernel, Rust for Linux Kernel, FUJITA Tomonori ----- Ursprüngliche Mail ----- > Von: "Boqun Feng" <boqun.feng@gmail.com> > An: "linux-um" <linux-um@lists.infradead.org>, "x86" <x86@kernel.org> > CC: "richard" <richard@nod.at>, "anton ivanov" <anton.ivanov@cambridgegreys.com>, "Johannes Berg" > <johannes@sipsolutions.net>, "tglx" <tglx@linutronix.de>, "mingo" <mingo@redhat.com>, "bp" <bp@alien8.de>, "dave > hansen" <dave.hansen@linux.intel.com>, "hpa" <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>, "dakr" <dakr@kernel.org>, "linux-kernel" <linux-kernel@vger.kernel.org>, "Rust for Linux Kernel" > <rust-for-linux@vger.kernel.org>, "FUJITA Tomonori" <fujita.tomonori@gmail.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@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(+) Acked-by: Richard Weinberger <richard@nod.at> Thanks, //richard ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 2026-01-06 14:20 ` Richard Weinberger @ 2026-01-07 3:26 ` Boqun Feng 0 siblings, 0 replies; 4+ messages in thread From: Boqun Feng @ 2026-01-07 3:26 UTC (permalink / raw) To: Richard Weinberger Cc: linux-um, x86, anton ivanov, Johannes Berg, tglx, mingo, bp, dave hansen, hpa, Miguel Ojeda, Gary Guo, Björn Roy Baron, Benno Lossin, Andreas Hindborg, Alice Ryhl, Trevor Gross, dakr, linux-kernel, Rust for Linux Kernel, FUJITA Tomonori On Tue, Jan 06, 2026 at 03:20:43PM +0100, Richard Weinberger wrote: > ----- Ursprüngliche Mail ----- > > Von: "Boqun Feng" <boqun.feng@gmail.com> > > An: "linux-um" <linux-um@lists.infradead.org>, "x86" <x86@kernel.org> > > CC: "richard" <richard@nod.at>, "anton ivanov" <anton.ivanov@cambridgegreys.com>, "Johannes Berg" > > <johannes@sipsolutions.net>, "tglx" <tglx@linutronix.de>, "mingo" <mingo@redhat.com>, "bp" <bp@alien8.de>, "dave > > hansen" <dave.hansen@linux.intel.com>, "hpa" <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>, "dakr" <dakr@kernel.org>, "linux-kernel" <linux-kernel@vger.kernel.org>, "Rust for Linux Kernel" > > <rust-for-linux@vger.kernel.org>, "FUJITA Tomonori" <fujita.tomonori@gmail.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@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(+) > > Acked-by: Richard Weinberger <richard@nod.at> > Queued with both tags applied, thank you both! Regards, Boqun > Thanks, > //richard ^ permalink raw reply [flat|nested] 4+ messages in thread
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2026-01-06 3:40 ` [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 Boqun Feng
2026-01-06 13:30 ` FUJITA Tomonori
2026-01-06 14:20 ` Richard Weinberger
2026-01-07 3:26 ` Boqun Feng
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