From nobody Fri Dec 19 07:18:07 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 C92451EB5DB for ; Sat, 8 Mar 2025 16:48:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741452502; cv=none; b=l1eRj1e6fnUHjkMhis1bcJmHGsH/JHBSBzwxHWJAWx3s89EaTNJiMcrYMDv+VxVo2cQ4PtTZuXf4cyeOizcnm04LzctyShX/a1z1B3LKYnmC8wES6WvuphWSUW707NgGCo1Ei+dcCTV6g6QVNhI5m26p+TF3aesWNBYp5Gij6ag= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741452502; c=relaxed/simple; bh=iGrVt5SIWyWVVTmRnZN0SZwdfWGj6TN1Wpw5Fld7GzA=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=NYJAyxLo0zNU+eODScQPRlLitr+jUXFvtUlV8HsDfsHX0rDTenOCzdq1H+H91GiK2U89UZqLnBLp79sifJ+MpK5EGkvyvmoBf0wRRaCHNL9OdHndb34bD2b2VCk1dV7hkDoLytizjBea1MrLJD9v4b+I3WZUfROaeEg8hALlvuI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=mj93E3NG; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=VDEn1dcD; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="mj93E3NG"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="VDEn1dcD" Message-ID: <20250308155623.635612865@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1741452498; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=1ZUFUQNw1HQq98JJ1JeSBCsqtOh9o5uM2O8I/kYQj8M=; b=mj93E3NGtP1NTygp3gfmaZHhcTbOZ28gCZve4+jnAIy1ZZVY7nKwwg5qt1TwT1kZWZuy3/ cJ+vOxYeZu/amSL82MUPe+PqMRq+MZMH+zutPJVeFxtNNhxTOg8R8tkn9UZwkQ9hMjB81J nDueegP9pWilpXwo4BzsphvELIwlpsa1FG6/NDiDG3caQ8HakOjV5ft5eSoSXH72Ae7MJI oiZm76miKpxUatsgvmC8PhsG00H6f1K3OT8Amfxjqj0mrmCz2HF1UGKjWmJgOtvaiezH+e HfQN1RmgTVZJx5yvwCf/kG1G05Rb/XAaV6YRKOBDc5tivEs6lfCyg3yS0S5QZw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1741452498; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=1ZUFUQNw1HQq98JJ1JeSBCsqtOh9o5uM2O8I/kYQj8M=; b=VDEn1dcDBUTG/ed4VFmeW9kpJ2rOFvBJVFrTwQfyqGVZqBjzboBKfXrN1sDgyA2WrhTPsW ObKQveB5UJo6NsDw== From: Thomas Gleixner To: LKML Cc: Anna-Maria Behnsen , Frederic Weisbecker , Benjamin Segall , Eric Dumazet , Andrey Vagin , Pavel Tikhomirov , Peter Zijlstra , Cyrill Gorcunov Subject: [patch V3 03/18] posix-timers: Add cond_resched() to posix_timer_add() search loop References: <20250308155501.391430556@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Sat, 8 Mar 2025 17:48:17 +0100 (CET) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Eric Dumazet 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 --- kernel/time/posix-timers.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -144,6 +144,7 @@ static int posix_timer_add(struct k_itim return id; } spin_unlock(&hash_lock); + cond_resched(); } /* POSIX return code when no timer ID could be allocated */ return -EAGAIN;