From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 17469CD0435 for ; Tue, 6 Jan 2026 03:40:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=RNrPWh5AE3rAmQHMWYYn+VrBXM2trm2Kn9xoWyeBbVA=; b=lfDAMpMj8a59y4M4ynnUPLR31B Bs52TnYr58foH/YpET1lWNO4HuPQdz+ydFMP0H4YHT/VwJCO3wBJQ3jVdtZTTyONlpfVTxvKcl/bY xRSUxely2eD/EEK5WYCXPOpn6VSX+UnIY7JuPdWlbZvgga/FcxTWkGmPmI7YoIA75iKbwJ0DUiA2Z zc6fJLLC+WBoiJ9qWedEn8dtLGYyX98EqmX467XMkG4AhSoMfa3HbxMsxtbqVz7QCDZ+97YGDKX31 YhGzNj+a/cKR9+r8iFubczBifbDYpavmDn0Hh6aQ9sDUAvlTNYz4qLONuYUqiCOtOEeklKA8TLAb1 z1lK4zjQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vcxw7-0000000CNoD-1psZ; Tue, 06 Jan 2026 03:40:47 +0000 Received: from mail-qv1-xf35.google.com ([2607:f8b0:4864:20::f35]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vcxw5-0000000CNnj-0v2z for linux-um@lists.infradead.org; Tue, 06 Jan 2026 03:40:46 +0000 Received: by mail-qv1-xf35.google.com with SMTP id 6a1803df08f44-890228ed342so5691726d6.2 for ; Mon, 05 Jan 2026 19:40:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1767670844; x=1768275644; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:feedback-id:from:to:cc:subject :date:message-id:reply-to; bh=RNrPWh5AE3rAmQHMWYYn+VrBXM2trm2Kn9xoWyeBbVA=; b=P8/xksAT5yKm/NmlHLkfStthYiBsRnhrmYtaV8ROmf8gYXaTjAEOEocBUMJhj+o3uo IuAl130pcaK46eNJTAd3QvqoRzk38wbXCeXEQkjizzq2Kt5bgsx1tb94u708sZ463Pvc ueqd3O8Cz7BZ0OkTAM3sty4jVeI3SrYmeQoNQXKOUVHRGONODvCZHTJTgD1L9BaPsaVC 8WWtZAGSFbRPXD2V0nIazAPWzwEi0mK/51wNhzkYmAsHiSZ8nJWfIYULU1grBufWr4d/ X1pR4b+F4vAF34SSIV4cROHRy8NH7czJeW1ktZ7piQc4OVsQ4GOIAI6jS18Y2mscBDfx /TXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767670844; x=1768275644; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:feedback-id:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=RNrPWh5AE3rAmQHMWYYn+VrBXM2trm2Kn9xoWyeBbVA=; b=jYMcfqLe/rbXYIyK0xbWBwVI3C3sROtXPWTwXvUizuqKLyIvBTzbeR0E9AygEkboDg 0CKyJEiogWJOWx8Yrtg6jDIsOFJ2ICuNWbhp0gsWvmx+0FkUvnRgbWGVSSCb3P6oarho tXsCso6EVyQ3vix8phK7XdQuzlpVMOje92wYLTgEb+CRuAPkey0MnDCZy5bqRssHLpKV lIboNuPirqhj5bkMKHERHOJcjBHMe+hm8TBC/AB5jIw2bKs2Yqhlr37J6T/R41Zi5Enq j+YlMrD2xPVrkiF1uK2x1B1dYeD4N/33GU2wauJ82EyZdiO41qy2NYNaYTVSOM/4hG1p Q/kA== X-Gm-Message-State: AOJu0YxkcwlLb9YvCkhX4xURbQDqaejmOV2MkENNaTMWZ1tXBZx3Gb8L HCtVi3ZIeFLzj94LWK4HZelLB+PEooZZz38IbL7lXQeZwj5aeAs1upbp X-Gm-Gg: AY/fxX4Hg9m7QEIM+/ash43b3HIFiSR4GhC8X8kpIWqUzr+gUXuSh3Da0X6r5Pp6Pfr iyQKde0wS3aI5fs9vUB9Yxp96G2E7TtzMfgu+fycCRt7+DTznr6uDNJPRUFNhntq/WC0Wf4RGWf vtFuFo3XQfYC5v2GpniAB26sKffIR4oLC1jVAeOgnVrwbICUDmQIhlM0uPp+9MXuOsLdRJ4Hg7a Ry984u3fLkZosvxENfTgdaxHj7HM7Adoc2bY5f0SD5CBJLgr9OCc1zwNibQRK7Rmu4R4VU6CTX5 JVotD1qJlggxX8OZTCyzQVVzSpfjJSLUz2zhVUDbmV7K1Hh+vpJYlCYiBAMCb9w11cA/+xojCDd 2A3XRxw/El24aX0xTr5ldyxIyK1GWOt7oVmQ1NHAuYWv4BGPM9k35zibT1G27NHAbZaWki+1GwH +HBl/20LH9jKGw4oPaRxDqoYq5SdooN1XmVmEj6kGEKnJb9X7R5SQuSZ2T2egtgZQUJcYnKv6O/ 5ya/7SShsPO1E0= X-Google-Smtp-Source: AGHT+IHxC3GLxP2uU71mYCKNA9W30x5Cz81+kFYZ7QfeUSFgXUvH7ja/9RuB546wY6MNOWsmqOyxjQ== X-Received: by 2002:a05:622a:418a:b0:4ee:1ed1:43c6 with SMTP id d75a77b69052e-4ffa7699f97mr21800511cf.10.1767670843731; Mon, 05 Jan 2026 19:40:43 -0800 (PST) Received: from fauth-a1-smtp.messagingengine.com (fauth-a1-smtp.messagingengine.com. [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: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260105_194045_273445_F0602F8E X-CRM114-Status: UNSURE ( 9.09 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org 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