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 X-Spam-Level: X-Spam-Status: No, score=-5.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6636EC43331 for ; Tue, 24 Mar 2020 14:24:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8CEB521473 for ; Tue, 24 Mar 2020 14:24:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="nOa862p5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728525AbgCXOYz (ORCPT ); Tue, 24 Mar 2020 10:24:55 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:36266 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728478AbgCXOYx (ORCPT ); Tue, 24 Mar 2020 10:24:53 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Subject:Cc:To:From:Date:Message-Id: Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To:References; bh=Bq9iittk7Qhb2lNlE0Btgsw/+4NODDlNnnHOmS2nT1U=; b=nOa862p53xYIjICWnbHVneDa2W KjSaQw/dLBiY8Qvc7BKghfUqPSAUGD3NdGCnvJunvWK+x1dZhp7v/g7RC4eUzKTP2Nb7yyHtShcSm HicLJ0W/iau1YAUx1+PFSLquLExz6X4mvmUCq2TcabyJD9CqhxhW2m4L/9gMMvNevItL5Tm6AyyG/ MCPq5n4A89qmcwSCaUjlLvNV8NTm0nF574eQeBexc/HKK9HbdnpBiH3CoRvN5/43r/4jf6gunHKDn 8gOTaa6OH/XiDjlg1V705ewFjBV7iZGXEjpytjGwuwMHTVXGysBsIbiTIaeQgAB8t6chw/SJkb0NR LsdsSgJA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jGkTt-0001fb-L5; Tue, 24 Mar 2020 14:24:37 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 070AC30743D; Tue, 24 Mar 2020 15:24:34 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id DAEC1286C13AD; Tue, 24 Mar 2020 15:24:34 +0100 (CET) Message-Id: <20200324135603.483964896@infradead.org> User-Agent: quilt/0.65 Date: Tue, 24 Mar 2020 14:56:03 +0100 From: Peter Zijlstra To: x86@kernel.org Cc: peterz@infradead.org, linux-kernel@vger.kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, bristot@redhat.com, jbaron@akamai.com, torvalds@linux-foundation.org, tglx@linutronix.de, mingo@kernel.org, namit@vmware.com, hpa@zytor.com, luto@kernel.org, ard.biesheuvel@linaro.org, jpoimboe@redhat.com Subject: [RESEND][PATCH v3 00/17] Add static_call() Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [resend; because of the typo in the lkml address] static_call(), is the idea of static_branch() applied to indirect function calls. Remove a data load (indirection) by modifying the text. The inline implementation still relies on objtool to generate the .static_call_sites section, mostly because this is a natural place for x86_64 and works for both GCC and LLVM. Other architectures can pick other means if/when they implement the inline patching. The out-of-line (aka. trampoline) variant doesn't require this. Patches can also be found here: git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/static_call Comments?