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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 B30F2C7618B for ; Wed, 24 Jul 2019 07:31:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 73D5E21841 for ; Wed, 24 Jul 2019 07:31:45 +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="gU+U/zF+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726444AbfGXHbo (ORCPT ); Wed, 24 Jul 2019 03:31:44 -0400 Received: from merlin.infradead.org ([205.233.59.134]:53470 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725851AbfGXHbo (ORCPT ); Wed, 24 Jul 2019 03:31:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=rK6nQW5CxubGjo+KYKz34q25ReCu2Bwr2lGkque7Bz8=; b=gU+U/zF+i2GFZYvOAUrXovQiK 3RNuvInAoa0BGHx7V/s8n0jnQQ7DmfMZDdnAuF0b29eLlfM3LSf+AYoZxmmMboy3Fx+Clniios6fp vk1fquZ5c26VdMn2cbnInDnrzPa9E1iPSwdNdvi+fvwlS4hJk/JTDmnxZKbp9Qny5J8s3G94mBXi1 yENc/Kq7FAqXDIeFz2XPv/7YsTFbwztJSqETaIhoW3ZCmVjyePuJH4yzAiTuWxSS/raSvKLBD+Dw0 32FcEhSx6VQOdPQD2N2uISYrwE3kOWDnsLXOgLfxYUcPcCv2q0MbuBATeCezWaNpan7Hk9TxT7wCm eoXE3DHfQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hqBkK-0001Tn-Tk; Wed, 24 Jul 2019 07:31:33 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 5C2F8201A93D3; Wed, 24 Jul 2019 09:31:30 +0200 (CEST) Date: Wed, 24 Jul 2019 09:31:30 +0200 From: Peter Zijlstra To: Nick Desaulniers Cc: Nathan Chancellor , Arnd Bergmann , Ingo Molnar , Andrew Morton , Linux Kernel Mailing List , clang-built-linux Subject: Re: [PATCH] [v2] waitqueue: shut up clang -Wuninitialized warnings Message-ID: <20190724073130.GH3402@hirez.programming.kicks-ass.net> References: <20190719113638.4189771-1-arnd@arndb.de> <20190723105046.GD3402@hirez.programming.kicks-ass.net> <20190723202159.GA79273@archlinux-threadripper> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 23, 2019 at 01:54:03PM -0700, Nick Desaulniers wrote: > Note that pre-clang-9 can be used for LTS x86_64; I don't think > CONFIG_JUMP_LABEL was made mandatory for x86 until 4.20 release, IIRC. > There's only a small window of non LTS kernels and only for x86 where > clang-9+ is really necessary. Given all the code-gen issues we've been finding, I wouldn't want to touch a pre-9 clang. Irrespective of wether it builds or not, it's absolutely unreliable crap.