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=-8.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 E1C38C43387 for ; Wed, 9 Jan 2019 21:03:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AEB5B206B7 for ; Wed, 9 Jan 2019 21:03:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=mailprotect.be header.i=@mailprotect.be header.b="ZwMYfiqk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727954AbfAIVDv (ORCPT ); Wed, 9 Jan 2019 16:03:51 -0500 Received: from com-out001.mailprotect.be ([83.217.72.83]:55889 "EHLO com-out001.mailprotect.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727584AbfAIVC6 (ORCPT ); Wed, 9 Jan 2019 16:02:58 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mailprotect.be; s=mail; h=Content-Transfer-Encoding:MIME-Version:References :In-Reply-To:Message-Id:Date:Subject:Cc:To:From:reply-to:sender:bcc: content-type; bh=ZMV7gDNRoLtiGxLW5K6St4H1NhKji5mLgVcpZF+8Umg=; b=ZwMYfiqkfQ5u aIxVym8OBxy1NedQZ9tAHv9p6F3lCXL2qINgjSealHDmSGd5D8klQZzvXFv6Ggd5adz9Sa5Ao/Okq mj7kpSN/I9NnDo7zCLr3OSKkJuwK15+n4THE6rQJ0xY7Zw77TxCFOE6P1Ktc3MiaGTzC1p6gh4xdN 0yeC/byABg+jTV2PMlD6+G6wVjtKSMHllt2iYyDNXWLphFsU1encRbMSED3qXHmYIgqttE/2T3x95 jmSQjHX/iAA1sgulziJt+Hy+FoK8VFg2eB0+ISwUSZcGGn5c56j1GNxGb7qMwnqy1x75asnGea0kH VOFzDyzO5jPuKLzczclE7w==; Received: from smtp-auth.mailprotect.be ([178.208.39.159]) by com-mpt-out001.mailprotect.be with esmtp (Exim 4.89) (envelope-from ) id 1ghKzm-0009D7-6Y; Wed, 09 Jan 2019 22:02:39 +0100 Received: from desktop-bart.svl.corp.google.com (unknown [104.133.8.89]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp-auth.mailprotect.be (Postfix) with ESMTPSA id 4037EC1623; Wed, 9 Jan 2019 22:02:21 +0100 (CET) From: Bart Van Assche To: peterz@infradead.org Cc: mingo@redhat.com, tj@kernel.org, longman@redhat.com, johannes.berg@intel.com, linux-kernel@vger.kernel.org, Bart Van Assche , Johannes Berg Subject: [PATCH v6 02/16] locking/lockdep: Avoid that add_chain_cache() adds an invalid chain to the cache Date: Wed, 9 Jan 2019 13:01:50 -0800 Message-Id: <20190109210204.192109-3-bvanassche@acm.org> X-Mailer: git-send-email 2.20.1.97.g81188d93c3-goog In-Reply-To: <20190109210204.192109-1-bvanassche@acm.org> References: <20190109210204.192109-1-bvanassche@acm.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Originating-IP: 178.208.39.159 X-SpamExperts-Domain: mailprotect.be X-SpamExperts-Username: 178.208.39.128/27 Authentication-Results: mailprotect.be; auth=pass smtp.auth=178.208.39.128/27@mailprotect.be X-SpamExperts-Outgoing-Class: ham X-SpamExperts-Outgoing-Evidence: Combined (0.13) X-Recommended-Action: accept X-Filter-ID: EX5BVjFpneJeBchSMxfU5lkKH0nzD9Hl6XkSTUYhpLF602E9L7XzfQH6nu9C/Fh9KJzpNe6xgvOx q3u0UDjvO1tLifGj39bI0bcPyaJsYTb/+zriNZuqQk0xRpGwjn+MTR8dtByWYYhgj25jR+mEA3YO AtfhCcV13BpIh8lqRXSSiFVwqwU9VgKUrYQ0lqWyFDaym8oavoPYsm7m1mVEGf0/5ST3nkt5XYDK YAuRpmF7E2F3eqKXiTd2ECUghryWXlqwG31yUGf3t09vBVYS71V1Pk0aHudBU1wyWVTA5OYS1waI XXCBiQFDV0yen8nGcSeERs4TOTnIH1kc1IWc5eLazqbUYkjl7F1LyK0RORrJ8za1Xua94uXRJx8c QBYGSNgvEAWLFiDAlQR6Wu0I/iWDegq4fQ11AxLVlrI7DVFg5Rj2g0fgHrO2rAGaVRcnzDg6HYuT CyYgL61SIkBTYXPEvhymCNb22qmKERGbL1SqvGGff0htQqhQf0/aDrhpLM4xnCPpmyyS7jgD9Nen VVoB/PLX+rmdznc91veCJAwpCI+5VHpzDqRcT2+GtIE8SRAgmLDKAcp9i+Q+BEiSUj07SNjVkl0P Pj+OUYZX3/1fKPQPEuPra72LpiTN2rUT6Y9xm3kmEG6YzhU+GhpkbBQllJXXeGX8fAMzPNqrCG8d f68W0InH/+bTMKNm38MHmfnhF9U/dVeZ9xbDBH3UiCDt3yfQxlhCaKc8coJFU+8pOMQJvQ/Ck3ii U+4DQAj38VcpxSBd167NiiR0DMS/T4GvZUhi7BJ7QOeRk66G/m8FNKZFrpMP+RrTJ6+mm5EZ2ArV RYQvvqpIzGzB/Lu0cOmi4NCsWYMWmOQKSBgUT96qltsYPx2OGpapJQwbU6lxiSPQp1QN34zBsoOP LAVTMEsOC75ReJHeVybconOP07vieGH1wwKQhUuVJ6kr80wTGaiTXW7z2lMqAnbumOwh0pBt+CpM AQh13vqug5h3DxwYylh7LQP0YxgmeE/Fl2+np9qLJ0kBSwhk58jFQqQIB5IAiDKO1d3jsySf+J0s zc1uD9pAwuLhqtxw5exj8Aw7fqb5R4VemuUI6bcEARsm0JyPNwoZFF/BeruF9IPYgMLyX2cd5RrN VWdImRunoKaV5Izq4VabSfIGUY8RJ38dSGEP+JYPRX76oPSBtBBPLYw1mZQfhvSXPX1npIQpGBE7 MnJiHvQ8gQs8eCOaG4DvtrnB4hxWBV/7jCqhcJq0hur2OKHH5lr9xXvSM4nM3avg X-Report-Abuse-To: spam@com-mpt-mgt001.mailprotect.be Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Make sure that add_chain_cache() returns 0 and does not modify the chain hash if nr_chain_hlocks == MAX_LOCKDEP_CHAIN_HLOCKS before this function is called. Cc: Peter Zijlstra Cc: Waiman Long Cc: Johannes Berg Signed-off-by: Bart Van Assche --- kernel/locking/lockdep.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index cb3fa7042886..7a7c2d7b01c2 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -2206,16 +2206,8 @@ static inline int add_chain_cache(struct task_struct *curr, chain_hlocks[chain->base + j] = lock_id; } chain_hlocks[chain->base + j] = class - lock_classes; - } - - if (nr_chain_hlocks < MAX_LOCKDEP_CHAIN_HLOCKS) nr_chain_hlocks += chain->depth; - -#ifdef CONFIG_DEBUG_LOCKDEP - /* - * Important for check_no_collision(). - */ - if (unlikely(nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)) { + } else { if (!debug_locks_off_graph_unlock()) return 0; @@ -2223,7 +2215,6 @@ static inline int add_chain_cache(struct task_struct *curr, dump_stack(); return 0; } -#endif hlist_add_head_rcu(&chain->entry, hash_head); debug_atomic_inc(chain_lookup_misses); -- 2.20.1.97.g81188d93c3-goog