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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 4A8DEC04EBF for ; Mon, 23 Sep 2019 14:36:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 26AC8207FD for ; Mon, 23 Sep 2019 14:36:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438000AbfIWOgl (ORCPT ); Mon, 23 Sep 2019 10:36:41 -0400 Received: from foss.arm.com ([217.140.110.172]:43382 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393411AbfIWOgk (ORCPT ); Mon, 23 Sep 2019 10:36:40 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CE9481000; Mon, 23 Sep 2019 07:36:39 -0700 (PDT) Received: from e113632-lin.cambridge.arm.com (e113632-lin.cambridge.arm.com [10.1.194.37]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 78F4D3F59C; Mon, 23 Sep 2019 07:36:38 -0700 (PDT) From: Valentin Schneider To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Peter Zijlstra , Thomas Gleixner , linux-xtensa@linux-xtensa.org, linux-sh@vger.kernel.org, linux-riscv@lists.infradead.org, uclinux-h8-devel@lists.sourceforge.jp, linux-c6x-dev@linux-c6x.org Subject: [PATCH v2 0/9] entry: preempt_schedule_irq() callers scrub Date: Mon, 23 Sep 2019 15:36:11 +0100 Message-Id: <20190923143620.29334-1-valentin.schneider@arm.com> X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I've left this to ~rot~ age out in the sun for a while, apologies for that. One early new-year resolution for me is to maintain a shorter resend timeout on this. This is the continuation of [1] where I'm hunting down preempt_schedule_irq() callers because of [2]. I've looked at users of preempt_schedule_irq(), and made sure they didn't have one of those useless loops. The list of offenders is: $ grep -r -I "preempt_schedule_irq" arch/ | cut -d/ -f2 | sort | uniq arc arm arm64 c6x csky h8300 ia64 m68k microblaze mips nds32 nios2 parisc powerpc riscv s390 sh sparc x86 xtensa Regarding that loop, archs seem to fall in 3 categories: A) Those that don't have the loop B) Those that have a small need_resched() loop around the preempt_schedule_irq() callsite C) Those that branch to some more generic code further up the entry code and eventually branch back to preempt_schedule_irq() arc, m68k, nios2 fall in A) sparc, ia64, s390 fall in C) all the others fall in B) I've written patches for B). As of 5.3 mainline contains those for: - arm64 - mips - x86 - powerpc - nds32 I've also got acks/reviews but haven't seen in any tree yet for: - c6x - csky - riscv - xtensa The remaining ones for which I haven't had any reply at all are - h8300 - microblaze - sh - sh64 Build-tested: - h8300 - c6x - microblaze - riscv No major change since v1 other than rebasing on top of 5.4 and collecting Reviewed-By / Acked-By. Thanks, Valentin [1]: https://lore.kernel.org/lkml/20190131182339.9835-1-valentin.schneider@arm.com/ [2]: https://lore.kernel.org/lkml/cc989920-a13b-d53b-db83-1584a7f53edc@arm.com/ Valentin Schneider (9): sched/core: Fix preempt_schedule() interrupt return comment c6x: entry: Remove unneeded need_resched() loop csky: entry: Remove unneeded need_resched() loop h8300: entry: Remove unneeded need_resched() loop microblaze: entry: Remove unneeded need_resched() loop RISC-V: entry: Remove unneeded need_resched() loop sh: entry: Remove unneeded need_resched() loop sh64: entry: Remove unneeded need_resched() loop xtensa: entry: Remove unneeded need_resched() loop arch/c6x/kernel/entry.S | 3 +-- arch/csky/kernel/entry.S | 4 ---- arch/h8300/kernel/entry.S | 3 +-- arch/microblaze/kernel/entry.S | 5 ----- arch/riscv/kernel/entry.S | 3 +-- arch/sh/kernel/cpu/sh5/entry.S | 5 +---- arch/sh/kernel/entry-common.S | 4 +--- arch/xtensa/kernel/entry.S | 2 +- kernel/sched/core.c | 7 +++---- 9 files changed, 9 insertions(+), 27 deletions(-) -- 2.22.0