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 B5ACE3ACFF4; Mon, 5 May 2025 23:19:17 +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=1746487158; cv=none; b=RelvxelOuc/+CRVUH/U3eH6iJhAzDFRZ42F/EBC3GhQVF2A20/xW2b4RhCGYcXYCrZBzfjNC1HwjUyTlrw76NgkA9hjh3sE+h2xsmpaQv1Ak0WKa/fAO4pmuVUsSK5H06dUOh/Lx/IojVXBOOiNzNqTBcVSpavoYjy5f8ozwNlE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746487158; c=relaxed/simple; bh=oV15o+gNwdtz8+mIe9nEr8gBfkSeqc4DoeCrsBC+qg4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AKOl3mcjiHhgGGrZ638Q+/jyFRci68M/X9pFfPz/5n+hHk22VORSWeSy9K1a8vbqVjrMJb/wmHWIlVZC/gx/D6XcbgjLJ0e7Jcdhu/tmH+po+hnqn0bCaICNCiLb61EBzQr3NK3FRDL1cdl0RTSbLXtuU2MwqS6Gw8mBhV9iC78= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BH3CH+7N; 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="BH3CH+7N" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C6D96C4CEEF; Mon, 5 May 2025 23:19:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746487157; bh=oV15o+gNwdtz8+mIe9nEr8gBfkSeqc4DoeCrsBC+qg4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BH3CH+7NZbtYh6QKlUHWNIva31ALhsqQThUAYqvrnMdbj8NgWHDAFwDWGkl6B9ynG 3hqp4wbE4FbeKguVD/wfMAKKMVkyHltBek56oSHDH9bM4ts3X/6oRMdc9mSXr1S2RZ Q7y1piXFZNSEkZCRw52cFJXhKGcAVQP2D5DMXhUVMLW3pBAEcEA6MYelwCKT3a9HcW DoMPjmMLuOIjyEUEVK0v6a/1pt+63ICoje33AfgHZzUYF/Qqx6U5iW2dkjBm6qfEFT iQvZX9+l2ltuyQC/9LQ//cF7+/D/Z2k0eN+TYR1A8ak/iCevIWKQ5dZZEi50qrg65a 5vQ3tQWHeUVwg== 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 5.10 032/114] posix-timers: Add cond_resched() to posix_timer_add() search loop Date: Mon, 5 May 2025 19:16:55 -0400 Message-Id: <20250505231817.2697367-32-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505231817.2697367-1-sashal@kernel.org> References: <20250505231817.2697367-1-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 5.10.237 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 29569b1c3d8c8..3a68c650ff2a3 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