From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A9B652F3A8F; Mon, 5 May 2025 23:14:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486891; cv=none; b=FueWDv6YdKqXJzySPv1sITqyzoDnxcCY58deojLDcjlBQEIqGzUqnvKn+HXMxbbaTt9qDk+uBpDgUaE3z6WI6ZKOAa99FdUONBBPJdOoI7s+ZH/vPWgM4IgAwZXuwehwlJpWtetvLvLULEqdZWt6z9BH4h8bKxsQThtJDmdP6FU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486891; c=relaxed/simple; bh=8ONW94dM+NZTcEz/+rs4aAEOz/0Y7F+L1BCO5cWJ4U0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Aa0H3klfq5aWcaoMxVisA/diA2rd4kRWmB6aNkFGi5QNR2DSZs2OOm90+oZco3Mf+oOZGwhKw0K6tmJ7iZka4TQMxO+8xeCdsQ/Q7enMDs3jRZF8pP/yM86/nzFtF0nirUijBhXCVuChVAtjYY7kUshZblBilT0CRF/G3e6AO3g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Hznrb6GK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Hznrb6GK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6ADB5C4CEF1; Mon, 5 May 2025 23:14:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746486890; bh=8ONW94dM+NZTcEz/+rs4aAEOz/0Y7F+L1BCO5cWJ4U0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hznrb6GKyQPyGbiWaY4gXCB7M/jZiuCJ7MDsf/etMk7aPl3qr2vbhml+YLtL/pWEt LZOEeAGWgHDzzt7AYzI/X478lJA96b3BBCEvB3qIREvCP/q9ePL1rLksq9HtHGJYtx 4wL4QGt+9OG+iNj6lB2+zKqHrl/cN4QIbHxRBrzQYmGhpojWQRfSJ9GtrbmqYB/A95 o78g+VaONToaLXZtuGABTJRPAaiwgo959d3j4mpN6XGXV3LkFH+wGPvB7iju/7rwfU geWXyrd4aETThPJjWU0pUKxYXFAyGJ/dwOsJEzYI5TfmB7MSFY30Nj6dzoPRR0E5E+ 4NS00pFmFNXSQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Eric Dumazet , Thomas Gleixner , Frederic Weisbecker , Sasha Levin , anna-maria@linutronix.de Subject: [PATCH AUTOSEL 5.15 046/153] posix-timers: Add cond_resched() to posix_timer_add() search loop Date: Mon, 5 May 2025 19:11:33 -0400 Message-Id: <20250505231320.2695319-46-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505231320.2695319-1-sashal@kernel.org> References: <20250505231320.2695319-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.181 Content-Transfer-Encoding: 8bit From: Eric Dumazet [ Upstream commit 5f2909c6cd13564a07ae692a95457f52295c4f22 ] With a large number of POSIX timers the search for a valid ID might cause a soft lockup on PREEMPT_NONE/VOLUNTARY kernels. Add cond_resched() to the loop to prevent that. [ tglx: Split out from Eric's series ] Signed-off-by: Eric Dumazet Signed-off-by: Thomas Gleixner Reviewed-by: Frederic Weisbecker Link: https://lore.kernel.org/all/20250214135911.2037402-2-edumazet@google.com Link: https://lore.kernel.org/all/20250308155623.635612865@linutronix.de Signed-off-by: Sasha Levin --- kernel/time/posix-timers.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index 2d6cf93ca370a..fc08d4ccdeeb9 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -161,6 +161,7 @@ static int posix_timer_add(struct k_itimer *timer) return id; } spin_unlock(&hash_lock); + cond_resched(); } /* POSIX return code when no timer ID could be allocated */ return -EAGAIN; -- 2.39.5