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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 B24F9ECE58C for ; Mon, 7 Oct 2019 11:25:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7E44921655 for ; Mon, 7 Oct 2019 11:25:40 +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="AC15jO7x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728304AbfJGLZk (ORCPT ); Mon, 7 Oct 2019 07:25:40 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:50182 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727745AbfJGLXi (ORCPT ); Mon, 7 Oct 2019 07:23:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:Subject:Cc:To:From:Date: Message-Id:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Id:List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner: List-Archive; bh=LddlgqOr3dajtcKVvBd1CcysEhG8VsH4/cZRTEpbFas=; b=AC15jO7x1pCQ m0SrZfKXUYUYHnSpt+pEOvci/SwMdPe1PYyEiKG7IHIX0bRQPrM4VCXQW50mnUIDHLfy4nAZ6t1Cv WYErmNAAuSFhPOIo2oHKGoFdxBJS/vXe13B+ZbSuh8f+ZmAauh6M3zNEJ2+XDH/Ht2uMy+7WrB253 s+uB7O/WaA0S8WWiyhps795jGHKZjmyQsNcTi7mOo0qa1Otfky6rYthnC06EpKG/1E22eCjPkBhEQ JGKPv7752ujMQuu/tyVflJftfx5gqAgkRg73YJfUBN+JEoOsNpw+9lZNAkEtbvpckt5Y5w3Bccgeu g/nKYooKP7SfnTQR0lGjXQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.2 #3 (Red Hat Linux)) id 1iHR6w-0003GO-EU; Mon, 07 Oct 2019 11:23:30 +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 15EF530705A; Mon, 7 Oct 2019 13:22:36 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 9ABF320244E28; Mon, 7 Oct 2019 13:23:26 +0200 (CEST) Message-Id: <20191007082708.01393931.1@infradead.org> User-Agent: quilt/0.65 Date: Mon, 07 Oct 2019 10:27:08 +0200 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: [PATCH v2 00/13] Add static_call() References: <20191007090225.44108711.6@infradead.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series, which depends on the previous two, introduces static_call(). static_call(), is the idea of static_branch() applied to indirect function calls. Remove a data load (indirection) by modifying the text. These patches are still based on the work Josh did earlier, but incorporated feedback from the last posting and have a lot of extra patches which resulted from me trying to actually use static_call(). This 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.