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 8AB7829A3C8; Mon, 5 May 2025 22:43:44 +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=1746485025; cv=none; b=lBqc2RXj1HNaCaVpBTWMpwrITKVR5vILH271to0KJfzkH5X51xe9rQQ1SBXay0UWM3CQytoJFX+QPXSJWOIlEkGOujW8Tab/3uscyM3XlEyXdlORAnliA3z+YaAcaQQsIx/wUFRshDyI7RWqAbsTBWIq2lU0KO2kJeZxQK9WyYM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746485025; c=relaxed/simple; bh=ZD7rDBrLE+YDGNuwAVcCT5/6aiwJAyvJL7pKhhsbqqo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=stQhf236qs4wskRr2w/fFmU9lpDRmnhj4FG61TYF43oDJoYHi9docdHKeaciCvvqS3qN3HcNdcqKk8d6ESX7yOFLyFHY4bQGYzGaHXZgW5jL9uTnAA/OwGQ6LcLPMDS9qZs6mzBNluXjjKwGXrJfNkAKPKxQ2ng2PHUDn+PsuEM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qmNKQGOg; 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="qmNKQGOg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B777C4CEF1; Mon, 5 May 2025 22:43:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746485024; bh=ZD7rDBrLE+YDGNuwAVcCT5/6aiwJAyvJL7pKhhsbqqo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qmNKQGOgjIUk5vTv1PsWZGDM1wHfDlIPOdQMfolHBNJsxqSQfUV1enFncx3DneylJ A0AaT1v8Ql/RgZZJ1Vht0RKsTOEQZwVLloWajg41Ga5FPNhQHSAzLXHZ0tPvG89ZDW IeLjp3597wp1s/m6+R3aomnOmNSu3fEBpE0MS289kA3NBVKaEoFJekUqodfwqpVE6g 7061+VoonLIsl1u9bTLoR8Uu30eY+fRWiqMxUqGEDN/dOJ03bGtq9yLNrEdwrboKpH h3cPtjKhbKyaXVKwwmW/fZHnRzYk/B11hiwp8KmOSFZxwmBklTKpXZLwlrj59GVGeu lOK1RWk6YZyKg== 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 6.12 129/486] posix-timers: Add cond_resched() to posix_timer_add() search loop Date: Mon, 5 May 2025 18:33:25 -0400 Message-Id: <20250505223922.2682012-129-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505223922.2682012-1-sashal@kernel.org> References: <20250505223922.2682012-1-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 6.12.26 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 4576aaed13b23..896ff735034ce 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