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 CB01D2ECFF6; Mon, 5 May 2025 23:08:26 +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=1746486506; cv=none; b=NrqKAmL9bTjVyOI9JTeN6tOK4m+xwMA7AeHO8pSva5hPZn8HhTnTyQEMotz4bJpg9Jw3WZkQCswisWtxlmh5avYGrBXZExW9qTtyMoAMZaFwxmhocg1rkjdc61jQisnqgNCoeSMTFuFNQo8Tn8KR+P2s3ZGY3RIlohoffbNfY9w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486506; c=relaxed/simple; bh=8ONW94dM+NZTcEz/+rs4aAEOz/0Y7F+L1BCO5cWJ4U0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mxqaCHnx+EYYkBNYmOutNu5MMs0p3K0sYvXPcZgdy9fBg6vyIHJILQwbXHNGXBKM6d4Ujv0azU2j00a8DhO2vR/z22XMqNh0yJm3FXpd/1N7MLQVyZSnriaFPmzEFEO8Tca9qwzrdTfX5waC0p6zet3plKoHmE7lN8GT8Fjb2rQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M+m0KR3q; 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="M+m0KR3q" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6558AC4CEEF; Mon, 5 May 2025 23:08:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746486506; bh=8ONW94dM+NZTcEz/+rs4aAEOz/0Y7F+L1BCO5cWJ4U0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M+m0KR3qc4NmOsrMk38k6z5uzPFonweaFERAcMT/Hd2svsmNL68vTiSPQkk0sfjgG bsdnmvmHwcK1/SgyAp8jSvr+mKHOYh+KmTWZ9oYvkfVAGFuetj5xn62FF1n1KcXfDX CFx7GQULMMt0y7kDMWAaeOX1kE9RYTUvRPgAaWqU62Le+iE2T7MgFHIuww4k1iZ1jY yC3LUSOcQO84hvt4/OD38oEFBVq2qHYFEQRvcx4xBYGX/pS847OchXvtaDqDLrhbLi XwQbG/qKdpjd1Ng/KTEUbegUVZLNwnAVnv0qHh2Dy/ZuHugPczOP0JWjG2n7gN49mW tvFoq5r2BPFJA== 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 6.1 065/212] posix-timers: Add cond_resched() to posix_timer_add() search loop Date: Mon, 5 May 2025 19:03:57 -0400 Message-Id: <20250505230624.2692522-65-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505230624.2692522-1-sashal@kernel.org> References: <20250505230624.2692522-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.136 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