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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1780987241; 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=R2e4RVSJjtCpz/u6ASF4RY7PH6icfN90zoN6TTrfeHI=; b=hgyxFnhuF4l7T94pV0BMD9VRFskJBHNhkiC30dWs4Jw/Cx7tBiCFIzMtCz8JTf/QVCudQK z07KcgyACls2ySGp5r+J4DuVG8iPRdUghwC6xr3FFyfUHG0SFxabTCU19vDKNN5P9hEfxu 9xKhmG76TuKP5lpbn8xQIbgW6qu8Hpw= 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 12/14] locking/ww_mutex: Open-code stress reorder list walk Date: Tue, 9 Jun 2026 14:38:53 +0800 Message-ID: <20260609063855.95710-3-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> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Kaitao Cheng A later change will make list_for_each_entry() cache the next element before entering the loop body. stress_reorder_work() can move list entries while handling wound/wait locking conflicts 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/test-ww_mutex.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c index 838d631544ed..08a6ab5ac041 100644 --- a/kernel/locking/test-ww_mutex.c +++ b/kernel/locking/test-ww_mutex.c @@ -519,7 +519,9 @@ static void stress_reorder_work(struct work_struct *work) do { ww_acquire_init(&ctx, stress->class); - list_for_each_entry(ll, &locks, link) { + for (ll = list_first_entry(&locks, typeof(*ll), link); + !list_entry_is_head(ll, &locks, link); + ll = list_next_entry(ll, link)) { err = ww_mutex_lock(ll->lock, &ctx); if (!err) continue; -- 2.43.0