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 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C760ECD98CA for ; Tue, 9 Jun 2026 13:54:50 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0D16310E416; Tue, 9 Jun 2026 13:54:45 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=linux.dev header.i=@linux.dev header.b="he6GgPtP"; dkim-atps=neutral Received: from out-182.mta1.migadu.com (out-182.mta1.migadu.com [95.215.58.182]) by gabe.freedesktop.org (Postfix) with ESMTPS id CC5C710E0DE for ; Tue, 9 Jun 2026 06:40:27 +0000 (UTC) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1780987225; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ti3NlENGD1xy6UWHiAqUuIahNtRBbWZIyoTi26e3ue0=; b=he6GgPtPJKyQqbLLyAMCJQtIvKnXUB6fnOtGZjDaTYP/O23mEyYFfmgA7fSp1I5PJAuubz uogDJo9ao5ATKhsgMnU5RoyORS39z6zaONQVyBHWxiqTrRv3UhHxH+rJlHwsb4JDAF2E5W TnJ4U0ZbWnBUHRJ9OloioR+ZJi737mM= From: Kaitao Cheng To: Andy Shevchenko , Muchun Song , Philipp Reisner , Lars Ellenberg , =?UTF-8?q?Christoph=20B=C3=B6hmwalder?= , Jens Axboe , Takashi Sakamoto , Andrzej Hajda , Neil Armstrong , Robert Foss , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Christian Koenig , Huang Rui , Eddie James , Mark Brown , Maxime Coquelin , Alexandre Torgue , Laxman Dewangan , Thierry Reding , Jonathan Hunter , Sowjanya Komatineni , Davidlohr Bueso , "Paul E . McKenney" , Josh Triplett , Peter Zijlstra , Ingo Molnar , Will Deacon , Boqun Feng , Liam Girdwood , Jaroslav Kysela , Takashi Iwai Cc: Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Matthew Auld , Matthew Brost , Waiman Long , drbd-dev@lists.linbit.com, linux-block@vger.kernel.org, linux1394-devel@lists.sourceforge.net, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-spi@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , Randy Dunlap , Christian Brauner , David Howells , Luca Ceresoli , Kaitao Cheng , Kaitao Cheng Subject: [PATCH v2 11/14] locking/locktorture: Open-code ww mutex list walk Date: Tue, 9 Jun 2026 14:38:52 +0800 Message-ID: <20260609063855.95710-2-kaitao.cheng@linux.dev> In-Reply-To: <20260609063855.95710-1-kaitao.cheng@linux.dev> References: <20260609061347.93688-1-kaitao.cheng@linux.dev> <20260609063855.95710-1-kaitao.cheng@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Mailman-Approved-At: Tue, 09 Jun 2026 13:54:41 +0000 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Kaitao Cheng A later change will make list_for_each_entry() cache the next element before entering the loop body. The ww-mutex torture path can move list entries while it resolves a wound/wait conflict and then continue from the adjusted cursor. Keep the list walk open-coded so the loop step observes the cursor selected by the body. This preserves the existing stress-test traversal semantics and prepares the code for the list iterator update. Signed-off-by: Kaitao Cheng --- kernel/locking/locktorture.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c index e618bcf75e2d..0eb75e9bccaa 100644 --- a/kernel/locking/locktorture.c +++ b/kernel/locking/locktorture.c @@ -644,7 +644,9 @@ __acquires(torture_ww_mutex_2) ww_acquire_init(ctx, &torture_ww_class); - list_for_each_entry(ll, &list, link) { + for (ll = list_first_entry(&list, typeof(*ll), link); + !list_entry_is_head(ll, &list, link); + ll = list_next_entry(ll, link)) { int err; err = ww_mutex_lock(ll->lock, ctx); -- 2.43.0