From nobody Fri Dec 19 21:46:58 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 07FB115746B for ; Mon, 10 Jun 2024 16:42:51 +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=1718037772; cv=none; b=R5AFIkas5FPGOK/ql+coa/hexl6SudUyd9QYrVu7P/y7UIGPTjncBhVUZh/W1bLXcdr77SWxzSSCLIhr0jRif/5mrNvRFvPMxqSv6qQyH9jzg+EQ0rpC1tKg4Pa48oZhql/NLzs0lcGpfLmkr2QfaksIHPVZB7HnopEABguuB5I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718037772; c=relaxed/simple; bh=XsbgZtCOc5ETrVPrJ/FtKkFplUEZ2QIE7aWQKb1cCHc=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=J4UTIdkB9Ayc2cHzg039AEneTokql2F3fh1gUMRSgWwNJqvtD7Pqjak7i0a4TH2RSf3DmqdHuzJKX95mZ1L9/pGu44SyXeMTqSHcxjZpOapASSmuByMDllMmECKq87aJnu/FzkIhbijBBKN9q5yrRxoYpRQoTfsyYwP+QnQZuVU= 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=m8KyEwe1; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=XdXl50y8; 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="m8KyEwe1"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="XdXl50y8" Message-ID: <20240610164027.668436817@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1718037768; 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=m8KyEwe1gjtu0ioaXkqDH0NdHS5e7870xH+P/Er08pBjYu3j+CqFMytL1ZRMJJccQtcGIm BvQg3DVQ9qZPH/GzaNwwwwbAyScyefiCxakaLeuV5R6z3fMycHzHy9SYyiFR9Gs2LelNfJ EVzU83uta+xIIRQv7IJ1IW9JNECB7lx9AirX0PDKIMcWn/bAv8q9rWKAxxnGSQrZXPN+Wq eUM/pLHiwXtaCIMmW8O08uaSXu8SdMf5CWLKuHK5mPB15IfzIqDLzUtAj+Js82Yo1eHgH9 aAVDu2YLoUoAEOcZydkawavbsGI2pNONcAZlNgRwRtF8g2hyeJ8w7d7LufrgDg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1718037768; 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=XdXl50y8CR72X2P5yTJolkSBEZppLYYiiLyKFa1EMw9V6lPiC33K2YD9eGtC8/+LdCUrp0 S7sm1HrIW82IMYBg== 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 V3 35/51] posix-cpu-timers: Use dedicated flag for CPU timer nanosleep References: <20240610163452.591699700@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Mon, 10 Jun 2024 18:42:48 +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;