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Peter Anvin" , "Peter Zijlstra (Intel)" , Sean Christopherson , Uros Bizjak , Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , Mark Rutland , Ryan Roberts , Fuad Tabba , linux-arm-kernel@lists.infradead.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , Anup Patel , Andrew Jones , Alexandre Ghiti , Conor Dooley , Samuel Holland , linux-riscv@lists.infradead.org, Huacai Chen , WANG Xuerui , Bibo Mao , Tiezhu Yang , Andrew Morton , Tianrui Zhao , loongarch@lists.linux.dev Subject: Re: [PATCH v3 1/2] rust: add static_key_false Message-ID: References: <20240621-tracepoint-v3-0-9e44eeea2b85@google.com> <20240621-tracepoint-v3-1-9e44eeea2b85@google.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Thu, Jun 27, 2024 at 10:34:39AM +0200, Alice Ryhl wrote: > On Tue, Jun 25, 2024 at 6:18 PM Boqun Feng wrote: > > > > Hi Alice, > > > > On Fri, Jun 21, 2024 at 10:35:26AM +0000, Alice Ryhl wrote: > > > Add just enough support for static key so that we can use it from > > > tracepoints. Tracepoints rely on `static_key_false` even though it is > > > deprecated, so we add the same functionality to Rust. > > > > > > It is not possible to use the existing C implementation of > > > arch_static_branch because it passes the argument `key` to inline > > > assembly as an 'i' parameter, so any attempt to add a C helper for this > > > function will fail to compile because the value of `key` must be known > > > at compile-time. > > > > > > Signed-off-by: Alice Ryhl > > > > [Add linux-arch, and related arch maintainers Cced] > > > > Since inline asms are touched here, please consider copying linux-arch > > and arch maintainers next time ;-) > > Will do. > > > For x86_64 and arm64 bits: > > > > Acked-by: Boqun Feng > > > > One thing though, we should split the arch-specific impls into different > > files, for example: rust/kernel/arch/arm64.rs or rust/arch/arm64.rs. > > That'll be easier for arch maintainers to watch the Rust changes related > > to a particular architecture. > > Is that how you would prefer to name these files? You don't want > static_key somewhere in the filename? > I could have been more explicit. My preference is (for example ARM64) * we have a rust/kernel/arch.rs, where we do: #[cfg(CONFIG_ARM64)] mod arm64::*; #[cfg(CONFIG_ARM64)] pub use arm64::*; * we have a rust/kernel/arch/arm64.rs: pub(crate) mod jump_label; * we have a rust/kernel/arch/arm64/jump_label.rs, where we put ARM64 arch_static_branch() there. (or static_key.rs and arch_static_key_false()). Then linux-arch can watch: rust/kernel/arch.rs rust/kernel/arch/ And ARM64 maintainers can watch: rust/kernel/arch/arm64.rs rust/kernel/arch/arm64 This is similar to how are organized today. Does this make sense? Regards, Boqun > > Another thought is that, could you implement an arch_static_branch!() > > (instead of _static_key_false!()) and use it for static_key_false!() > > similar to what we have in C? The benefit is that at least for myself > > it'll be easier to compare the implementation between C and Rust. > > I can try to include that. > > Alice 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 1B9CDC2BD09 for ; Thu, 27 Jun 2024 16:27:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=duyF18jlG8ajAZgO0mfYYnI3gcEzINI2KtTL6sHpk8k=; b=P+uf9aqLfKgB+O O78bZic7H/58UFOvITxKWcSxzQdznuVso7ujJSkDEvYCPQW6QR0U/HHxKSQ9u7sG4cYDr6X/1s/Nt jVCod8ZbLktRuq/I3Ped7JjrvvyNV+swwiX0c2RLnN8ErAAR3t6SCG6p0iNIkUH0gmRE4Np4MvOn7 L0YrU55P44+9Cmslj4mPrtMT7UNDeapCRyZUrHkmh3t2wW8mUr9uYipZ9sYI77tJ7rfUToUgrkQth 1rlS2UH21bdkM4STJpCk54wsYCVbVoYaHjW7mu7cs+VMf6IwkDshK7za2Oiz+7Cp7u5nHDtH7ukib S2gT7y/9woRh0KFqFodg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sMryD-0000000B2NZ-07nF; Thu, 27 Jun 2024 16:27:37 +0000 Received: from mail-yb1-xb2c.google.com ([2607:f8b0:4864:20::b2c]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sMry8-0000000B2Mk-28Ae; Thu, 27 Jun 2024 16:27:34 +0000 Received: by mail-yb1-xb2c.google.com with SMTP id 3f1490d57ef6-df481bf6680so7726048276.3; Thu, 27 Jun 2024 09:27:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1719505651; x=1720110451; darn=lists.infradead.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :feedback-id:from:to:cc:subject:date:message-id:reply-to; bh=920O8PJb054pqxNaJJIQxYWqrCoZjbSlHkszY3iGPvs=; b=ZAS/vLaoh/S0uZUYpNxrwF9MX9/jmLkUvX76pmnvfuCY+traidUrZkFoKmnzEq92zX qG5uAlrCLkONOjFMdp5CZIYLhl5XigbIjHwe5wSCJIwCFRHrP7+BrRT5nMVwUwqtAWby l1M8KeRG6WWwh74HBRDMBEVbjYWBAIroaaFWT0XMhy7Ylani373LpG+aFGz8RNwLqAaD CkDx2yVrhVZ1GaYJGBTPkUzaLm6kIUPhz206+4sNY9oRf7GnLkcmWLABJTY9kmoKp5B0 DATTTbCBLDM1i1nO+T/eVtDFQJNLScmab4qicf5kIJPoCTR8dMZSA4Q9iPAxKZhpmhpn KZsA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719505651; x=1720110451; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :feedback-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=920O8PJb054pqxNaJJIQxYWqrCoZjbSlHkszY3iGPvs=; b=sc6u62db67egTM3An0mlIll0Htk7/cvXZFKmB396beGS/xPdcwZho6L7DWeL66IMW8 O6DR5ZJSeMc4chZYWgTKY+/kRye6NKDgtf+uWLpvEffnitTIlgzA0vyRzifiPK/IQCbr oGyf3zO1w2xJvYkp6tpT2dDBaKQgwGx+472v3KYlqCjbtoQ82mX7XcWXW0ZpGT029UZj QBys0vGj+Hxur3ZtQJTTK7W759CJ9f6V7smSQii/xdZDX97r44sBc3jnBqU0YK3J8qhw 2XrBI0ueRAUQ0+OxEux24scx760Nl6/84Eei9XlLWjMXjNToTTWCmlq/YYhM0Tn2ogTP UApg== X-Forwarded-Encrypted: i=1; AJvYcCUB32ZDYgqB5ekKWE3W4Qo6S2r+bb6Y/j+zEh0M6psiuLicATxG5TY312Y3C7gvbgDtuvzVfzAlRmhC6uCG+gSJo7ZpnVPO0F/Mf5xqYxEcgnMMd+8FpgK8bk9JbnbvtbQjWPSP09fDOlAa0bivjFmyGNXSXvM= X-Gm-Message-State: AOJu0YxM8HNVwAijIJY0ANPcRK2oPirL1MEl3nm5+m2J1C0sYnbj15Wn 0UNtOwyDMFOUgFJPyfwlJPLQ4NQPhUliZkhgwStGzhzxBG+1HDJK X-Google-Smtp-Source: AGHT+IGwxxdsNJaSRrxxnarDfWOg8gwIpRPpDqBy5+0MsnlygCimQkzcmz4X9ntl94Mzzv8FRU5gdQ== X-Received: by 2002:a25:c544:0:b0:df7:9773:4571 with SMTP id 3f1490d57ef6-e0303ed4c67mr13804035276.11.1719505651417; Thu, 27 Jun 2024 09:27:31 -0700 (PDT) Received: from fauth2-smtp.messagingengine.com (fauth2-smtp.messagingengine.com. 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