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 65D442D5CE7; Mon, 5 May 2025 22:20:52 +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=1746483652; cv=none; b=hrvHpLC7bT2wShp70fmg3qM1aq26/6eM8C0jtQ+6k++oPBs2p4I5nQXqtjKS4kM9bNQAElH/mmEEZ3C53Sr4ThAAWAvd7TUahjQ4ka0HG0wXrbM5kdc+rF03yDO71dMoGOt6v5/jieodOXkisqPZbX3eaL6Xdc5LIQo7gA2O2jY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746483652; c=relaxed/simple; bh=Y2lIswP846yCmP7PzBnewNLP0DbVkvOFt7Ago3FSv4I=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=fIU8K2w5g90IVz6/Kd22JoI3/csIttK6Ja2OuQkeuzPsAPTlqBKOUAe/uzz2xueQFZTK/qOQ3twHKtBADASXcN4U5o+8RKiTUK2JOExU3cWb10ZEqzEw2BUHHI38X4QJtbNZWCMz9fBTgIiz0Z8ChNRdsaGe9GOpzWV5KM8PDto= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=e6OaTWol; 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="e6OaTWol" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C9DAC4CEEF; Mon, 5 May 2025 22:20:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746483652; bh=Y2lIswP846yCmP7PzBnewNLP0DbVkvOFt7Ago3FSv4I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e6OaTWolXnAukSNUtuJ2Ic1We9EsyqMFnC2Yu7kwfYo1nN3UfQyQZLkwAA8CUqjj7 8vPviHJRKbw3rjqz0ZpipwsiPV+36J8JGsP11vqBCvbcai6bpBEm5SZfb/TaOekubR iXLN0aW/QuE0ZRWJNsyH4iB31qpCYNp1DUr6Fol4QSB/vFiZ1atUphXcWxbkMaw90t 71z86qUavD8Bye2ZabjryZkv6XUD1rKX1T/g15h5SVfooPkqojBHLKkM7wCVX5p6cd 4yomNCv9Zwd74n2zJV9gj9AaMnXe53Pn1orwqPo062Y4O7GE1bLdEtzCd6SqxydfSS C6M10g2DnvyKw== 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 6.14 162/642] posix-timers: Add cond_resched() to posix_timer_add() search loop Date: Mon, 5 May 2025 18:06:18 -0400 Message-Id: <20250505221419.2672473-162-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505221419.2672473-1-sashal@kernel.org> References: <20250505221419.2672473-1-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 6.14.5 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 1b675aee99a98..7f8644e047558 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -118,6 +118,7 @@ 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