From nobody Fri Dec 19 20:10:16 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 E088B8175E for ; Wed, 10 Apr 2024 22:47:13 +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=1712789235; cv=none; b=Uo7qT/60Ujd9L67JKzv3NZoCK8BHo31QAWFWVNKQmZ9KiaAogPVDlBsob9w3+o4JZOmQxDDzzlexRm/hq41fGSO2wYymr+4j7ln1lGkiSCYL55EKAHPJEKHbn6d+EvLZmLp3qa8XCt95G1AdrczMMOeqOi7sdQZXP5JnBrUHDgo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712789235; c=relaxed/simple; bh=XsbgZtCOc5ETrVPrJ/FtKkFplUEZ2QIE7aWQKb1cCHc=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=NJIdtOJ1sLLAyBCkWtSAv3G+L6dcJxcmTtkuX7rcikNG2qhvqkjfksvIl147a9liIVUMlVUUidPQ/7jo3AP3xOqMvzK3LZvEoO/f9GiVgd4Ee22b+B6xW5UcDyT+0wcrEyRHed19Y4ZybClGWMqcGVa3hFaXuBxAJhCHsKEbuQ8= 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=VnUu5UoH; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=CFtICFy1; 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="VnUu5UoH"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="CFtICFy1" Message-ID: <20240410165553.080403121@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1712789232; 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=MQO2EYZPqj5U7pySt49QYzOaZrWaUy6rIJlwsdY8EF8=; b=VnUu5UoHDvK8n4kJSBRl6PdAIf/aC8599XcwM8idmqAUlEszj4tpOzu11AJToVKW+28kfu k64SBsgVoa4CzLclyrWPNDGgtrUl0EU2Lx4quBCLRJzPvi3YPcleI0y6CK7I9YYR0eKLnB ePeXHcKn+9fwfpYk3ZpyKOrV7gEV55M8Vfs8jyVuupCSHHBQy08ZaZYTb+84w8hvWInQkh MYZM6gySeAbSiI0+rueL8lXF+C8I+6Xi3dbaOjeygl5aEtLi0/fWE6grEnHnx4QxfjIf8t wISMl3sHPWMlHilU9n/R+vSSan2rKvw3QOS904d4aNKka7bowAoqNrG0jPQ0EQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1712789232; 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=MQO2EYZPqj5U7pySt49QYzOaZrWaUy6rIJlwsdY8EF8=; b=CFtICFy16+rLTegzsdwBNe7ea/fcn7FE2j/lwCDicVWSMDD214U9/+KkV0B2cyqVu3HiB2 o/YghTJnGQllkABQ== From: Thomas Gleixner To: LKML Cc: Anna-Maria Behnsen , Frederic Weisbecker , John Stultz , Peter Zijlstra , Ingo Molnar , Stephen Boyd , Eric Biederman , Oleg Nesterov Subject: [patch V2 34/50] posix-cpu-timers: Use dedicated flag for CPU timer nanosleep References: <20240410164558.316665885@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Thu, 11 Apr 2024 00:47:12 +0200 (CEST) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" POSIX CPU timer nanosleep creates a k_itimer on stack and uses the sigq pointer to detect the nanosleep case in the expiry function. Prepare for embedding sigqueue into struct k_itimer by using a dedicated flag for nanosleep. Signed-off-by: Thomas Gleixner --- include/linux/posix-timers.h | 4 +++- kernel/time/posix-cpu-timers.c | 3 ++- 2 files changed, 5 insertions(+), 2 deletions(-) --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -42,6 +42,7 @@ static inline int clockid_to_fd(const cl * @pid: Pointer to target task PID * @elist: List head for the expiry list * @firing: Timer is currently firing + * @nanosleep: Timer is used for nanosleep and is not a regular posix-timer * @handling: Pointer to the task which handles expiry */ struct cpu_timer { @@ -49,7 +50,8 @@ struct cpu_timer { struct timerqueue_head *head; struct pid *pid; struct list_head elist; - int firing; + bool firing; + bool nanosleep; struct task_struct __rcu *handling; }; =20 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -588,7 +588,7 @@ static void cpu_timer_fire(struct k_itim =20 timer->it_status =3D POSIX_TIMER_DISARMED; =20 - if (unlikely(timer->sigq =3D=3D NULL)) { + if (unlikely(ctmr->nanosleep)) { /* * This a special case for clock_nanosleep, * not a normal timer from sys_timer_create. @@ -1479,6 +1479,7 @@ static int do_cpu_nanosleep(const clocki timer.it_overrun =3D -1; error =3D posix_cpu_timer_create(&timer); timer.it_process =3D current; + timer.it.cpu.nanosleep =3D true; =20 if (!error) { static struct itimerspec64 zero_it;