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=-6.8 required=3.0 tests=BAYES_00, 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 05D84C433E1 for ; Mon, 17 Aug 2020 00:45:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D7A6C206C0 for ; Mon, 17 Aug 2020 00:45:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726682AbgHQAp0 (ORCPT ); Sun, 16 Aug 2020 20:45:26 -0400 Received: from mx2.suse.de ([195.135.220.15]:54670 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726221AbgHQApW (ORCPT ); Sun, 16 Aug 2020 20:45:22 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 713C2AB8B; Mon, 17 Aug 2020 00:45:45 +0000 (UTC) From: Davidlohr Bueso To: akpm@linux-foundation.org Cc: oleg@redhat.com, axboe@kernel.dk, linux-kernel@vger.kernel.org, Davidlohr Bueso Subject: [PATCH -next 0/2] tasklist_lock vs get/set priority syscalls Date: Sun, 16 Aug 2020 17:31:46 -0700 Message-Id: <20200817003148.23691-1-dave@stgolabs.net> X-Mailer: git-send-email 2.26.2 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 Hi, This is a (late) update on trying to reduce some of the scope of the tasklist_lock for get/setpriority(2) as well as the block io equivalent. This version addresses Oleg's previous concerns and incorporates his feedback. Changes from v1: https://lore.kernel.org/lkml/20200512000353.23653-1-dave@stgolabs.net/ - only take the lock for PGID cases. - drop bogus PF_EXITING checks (and live with the small exit race). - add patch for IOPRIO_WHO_PGRP. Please consider for v5.10. Thanks! Davidlohr Bueso (2): kernel/sys: only take tasklist_lock for get/setpriority(PRIO_PGRP) block: fix ioprio_get/set(IOPRIO_WHO_PGRP) vs setuid(2) block/ioprio.c | 4 ++++ kernel/sys.c | 16 ++++++++-------- 2 files changed, 12 insertions(+), 8 deletions(-) -- 2.26.2