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=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_NEOMUTT 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 28947C2BCA1 for ; Fri, 7 Jun 2019 14:21:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 07E17206E0 for ; Fri, 7 Jun 2019 14:21:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729125AbfFGOVT (ORCPT ); Fri, 7 Jun 2019 10:21:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33772 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728257AbfFGOVS (ORCPT ); Fri, 7 Jun 2019 10:21:18 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0AC39223892; Fri, 7 Jun 2019 14:21:17 +0000 (UTC) Received: from treble (ovpn-124-241.rdu2.redhat.com [10.10.124.241]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3820D8CF80; Fri, 7 Jun 2019 14:21:09 +0000 (UTC) Date: Fri, 7 Jun 2019 10:21:02 -0400 From: Josh Poimboeuf To: Peter Zijlstra Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Ard Biesheuvel , Andy Lutomirski , Steven Rostedt , Ingo Molnar , Thomas Gleixner , Linus Torvalds , Masami Hiramatsu , Jason Baron , Jiri Kosina , David Laight , Borislav Petkov , Julia Cartwright , Jessica Yu , "H. Peter Anvin" , Nadav Amit , Rasmus Villemoes , Edward Cree , Daniel Bristot de Oliveira Subject: Re: [PATCH 01/15] x86/entry/32: Clean up return from interrupt preemption path Message-ID: <20190607142102.tgyb6vlfslfsyqtq@treble> References: <20190605130753.327195108@infradead.org> <20190605131944.591902815@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190605131944.591902815@infradead.org> User-Agent: NeoMutt/20180716 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Fri, 07 Jun 2019 14:21:18 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 05, 2019 at 03:07:54PM +0200, Peter Zijlstra wrote: > The code flow around the return from interrupt preemption point seems > needlesly complicated. "needlessly" > > There is only one site jumping to resume_kernel, and none (outside of > resume_kernel) jumping to restore_all_kernel. Inline resume_kernel > in restore_all_kernel and avoid the CONFIG_PREEMPT dependent label. > > Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Josh Poimboeuf -- Josh