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 5026A283682; Mon, 5 May 2025 23:22:32 +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=1746487353; cv=none; b=H4k4Hb7YtxL3sND3wQi1w4VgZXJB60WjDOB9zNFLFVsTv6JM091Qyd7oD71IVutNN9gtNRe5Fk1B3UPvHV34otceapGyfP1ebPyx91Y0xOgjZVt6kFYz6RdNAus0jABmxKm2Fwu+SClmAuIwBA0P8F+mUY1aqEFHZQ7DXVe87YA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746487353; c=relaxed/simple; bh=lDfndmTRz9NS0CQiVMjWt0i3Ue2Jtj5vonl4EvPa/N0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=fgFztG8WxQYAuyE8qvNzAERRwTJHxRtGUlnyDDlh8LwPDFieAF7ZbR3CuWukIouA+m3EbeWzpeFpApXt5n9XKAeDbiw38NihEKg0pfn5BOz8Pzu5ZTVquKbbnmHQ7A6nsCgDkGQ/MpE5ZDAVtHVIShVBPAMgQ0I7jkI+g2zoFFo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eKiS70JX; 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="eKiS70JX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48DA9C4CEEF; Mon, 5 May 2025 23:22:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746487352; bh=lDfndmTRz9NS0CQiVMjWt0i3Ue2Jtj5vonl4EvPa/N0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eKiS70JXI2A2IDr0cOZEKHOtoGfy7OlGQvmQUTnlNZGzLS74nzTAyvQVbpAFISQjK 6DU6PqcRI+HK+58a8cKCOcG4G6FYBRLM5gFMJH2J06vkfddQowpMHBictBb3TzT2hN vCS4/UBYDH4ocwGlsWnut8g6DxNpMc0P6uS8gYua7Q3RdXR9kAO2Xm0pnHtowdgU93 adW/BaRbL1l9brC6yq15uYW5tK3nS4fArsapgrRURvrG5JIARX2qAsN3V0LjJ4plu7 71wQx+ZBmXwz/ua+fZmL0A/iYI/rOU2Ww8FbnRsQsH+Zl+mtLq5cg+nhXxqp1EB64N f6woiT+BNprkA== 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 5.4 24/79] posix-timers: Add cond_resched() to posix_timer_add() search loop Date: Mon, 5 May 2025 19:20:56 -0400 Message-Id: <20250505232151.2698893-24-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505232151.2698893-1-sashal@kernel.org> References: <20250505232151.2698893-1-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 5.4.293 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 f3b8313475acd..2a2e4f6622ae7 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -159,6 +159,7 @@ 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