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[103.168.172.200]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8907727c6besm6387786d6.54.2026.01.05.19.40.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Jan 2026 19:40:43 -0800 (PST) Received: from phl-compute-03.internal (phl-compute-03.internal [10.202.2.43]) by mailfauth.phl.internal (Postfix) with ESMTP id 9B58FF4006C; Mon, 5 Jan 2026 22:40:42 -0500 (EST) Received: from phl-frontend-03 ([10.202.2.162]) by phl-compute-03.internal (MEProxy); Mon, 05 Jan 2026 22:40:42 -0500 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefgedrtddtgdelledufecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpuffrtefokffrpgfnqfghnecuuegr ihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjug hrpefhvfevufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpeeuohhquhhnucfh vghnghcuoegsohhquhhnrdhfvghnghesghhmrghilhdrtghomheqnecuggftrfgrthhtvg hrnhepgeeljeeitdehvdehgefgjeevfeejjeekgfevffeiueejhfeuiefggeeuheeggefg necuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepsghoqh hunhdomhgvshhmthhprghuthhhphgvrhhsohhnrghlihhthidqieelvdeghedtieegqddu jeejkeehheehvddqsghoqhhunhdrfhgvnhhgpeepghhmrghilhdrtghomhesfhhigihmvg drnhgrmhgvpdhnsggprhgtphhtthhopedvvddpmhhouggvpehsmhhtphhouhhtpdhrtghp thhtoheplhhinhhugidquhhmsehlihhsthhsrdhinhhfrhgruggvrggurdhorhhgpdhrtg hpthhtohepgiekieeskhgvrhhnvghlrdhorhhgpdhrtghpthhtoheprhhitghhrghruges nhhougdrrghtpdhrtghpthhtoheprghnthhonhdrihhvrghnohhvsegtrghmsghrihgugh gvghhrvgihshdrtghomhdprhgtphhtthhopehjohhhrghnnhgvshesshhiphhsohhluhht ihhonhhsrdhnvghtpdhrtghpthhtohepthhglhigsehlihhnuhhtrhhonhhigidruggvpd hrtghpthhtohepmhhinhhgohesrhgvughhrghtrdgtohhmpdhrtghpthhtohepsghpsegr lhhivghnkedruggvpdhrtghpthhtohepuggrvhgvrdhhrghnshgvnheslhhinhhugidrih hnthgvlhdrtghomh X-ME-Proxy: Feedback-ID: iad51458e:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 5 Jan 2026 22:40:41 -0500 (EST) From: Boqun Feng To: linux-um@lists.infradead.org, x86@kernel.org Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, FUJITA Tomonori Subject: [PATCH] arch: um/x86: Select ARCH_SUPPORTS_ATOMIC_RMW for UML_X86 Date: Tue, 6 Jan 2026 11:40:34 +0800 Message-ID: <20260106034034.60074-1-boqun.feng@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- UM & x86 maintainers, I need this to avoid a build error for Rust atomics since Rust currently only support Atomic 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