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=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 CE692C4363A for ; Mon, 19 Oct 2020 21:12:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 020BB222C2 for ; Mon, 19 Oct 2020 21:12:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="n9YVFtdw"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="9pvYjSU9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 020BB222C2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 175346B005D; Mon, 19 Oct 2020 17:12:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 102286B0062; Mon, 19 Oct 2020 17:12:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F08706B0068; Mon, 19 Oct 2020 17:12:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0068.hostedemail.com [216.40.44.68]) by kanga.kvack.org (Postfix) with ESMTP id C16446B005D for ; Mon, 19 Oct 2020 17:12:48 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 6426E1EE6 for ; Mon, 19 Oct 2020 21:12:48 +0000 (UTC) X-FDA: 77389924416.08.teeth78_120ccd22723a Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin08.hostedemail.com (Postfix) with ESMTP id 3919D1819E769 for ; Mon, 19 Oct 2020 21:12:48 +0000 (UTC) X-HE-Tag: teeth78_120ccd22723a X-Filterd-Recvd-Size: 3719 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by imf38.hostedemail.com (Postfix) with ESMTP for ; Mon, 19 Oct 2020 21:12:47 +0000 (UTC) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1603141964; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=xDvrn3khPRCsQ3kInC9PrrCmCeDblVbtH3pwV9O3vYI=; b=n9YVFtdwNtjSN+/ua96l0MsskldSlV9SMYPXxeyfZVkSroaPpJvfdUVPxpnadtpw8deZUb 1WHNTN+KDfNjTi5UZ+5JOsQnj3hKLVpZBmM3AvPzZbyN5ABYaSPpbmydgqCm1PW2xBsZgF Q+nm3lSRfwtU5hQYk2LEyrERhPTG5W7qQM+OHhPMeEsTb8WmZ33Sr7pfpqqDyEnw+2bwPZ mhZeW6+h9IbsAcKPvE8+85NjwtEUamW1g9p+fRj5XzKvrT8+oyOpngKl2sl4fiIQ1cKXKF HyeHOPQrhTNVU1BJ7gA8h0b9FzwHiJulPZYt8a+b4KPuO/6HVkXyaHmcT6NS/w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1603141964; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=xDvrn3khPRCsQ3kInC9PrrCmCeDblVbtH3pwV9O3vYI=; b=9pvYjSU9yrEDoXWUmWAb3RLmG8qQCf74kogPetVI1dOtIQWI6qjPgTtxmM6U2rfV5AqgLV KTo8wQwFYiESmpBw== To: Ira Weiny Cc: Peter Zijlstra , Ingo Molnar , Borislav Petkov , Andy Lutomirski , x86@kernel.org, Dave Hansen , Dan Williams , Andrew Morton , Fenghua Yu , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH RFC V3 6/9] x86/entry: Pass irqentry_state_t by reference In-Reply-To: <20201019202647.GD3713473@iweiny-DESK2.sc.intel.com> References: <20201009194258.3207172-1-ira.weiny@intel.com> <20201009194258.3207172-7-ira.weiny@intel.com> <20201016114510.GO2611@hirez.programming.kicks-ass.net> <87lfg6tjnq.fsf@nanos.tec.linutronix.de> <20201019053639.GA3713473@iweiny-DESK2.sc.intel.com> <87k0vma7ct.fsf@nanos.tec.linutronix.de> <20201019202647.GD3713473@iweiny-DESK2.sc.intel.com> Date: Mon, 19 Oct 2020 23:12:44 +0200 Message-ID: <871rhtapir.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Oct 19 2020 at 13:26, Ira Weiny wrote: > On Mon, Oct 19, 2020 at 11:32:50AM +0200, Thomas Gleixner wrote: > Sorry, let me clarify. After this patch we have. > > typedef union irqentry_state { > bool exit_rcu; > bool lockdep; > } irqentry_state_t; > > Which reflects the mutual exclusion of the 2 variables. Huch? From the patch I gave you: #ifndef irqentry_state typedef struct irqentry_state { bool exit_rcu; + bool lockdep; } irqentry_state_t; #endif How is that a union? > But then when the pkrs stuff is added the union changes back to a structure and > looks like this. So you want: 1) Move stuff to struct irqentry_state (my patch) 2) Change it to a union and pass it as pointer at the same time 3) Change it back to struct to add PKRS > Is that clear? What's clear is that the above is nonsense. We can just do #ifndef irqentry_state typedef struct irqentry_state { union { bool exit_rcu; bool lockdep; }; } irqentry_state_t; #endif right in the patch which I gave you. Because that actually makes sense. Thanks, tglx