From nobody Mon Nov 25 02:52:59 2024 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 7ADD21A3BC8 for ; Thu, 31 Oct 2024 15:46:29 +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=1730389591; cv=none; b=VM3wdtQveFQOCrDbZaqM6BrZXWS0mj37B7oL86jayaEztEZ17soeEo8j/E5eZDJeH2ePdiAnBXLt7fUP7iStnt1xfy7D4GQf2zkaY8xgkE7tQC+UMLEmSpMe7TgKgfUZ6ucTghtcFO2KpXg6cda9kCrZvhsr1VRJ7tvzqRObycI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730389591; c=relaxed/simple; bh=6QadadNKAM5qb4g5XADfumRJa53grKZV/xEszGMAJLc=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=rm/A3IH0gO09VX0hl/HLM1oUoR6Ivx99coEWCVL157ky6WhcIbT8rMrC38oHHzInO0wlzpjLZHWi2mM5m3h/1csU6hlsg4JZDBQFtQn49ayxvI0LjIpV9vaMVcbFZ4YaSAKdL0NdbSmNF6abC2u66b38z0MR5T2JhuX0IXqtliA= 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=IXCcTG2F; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=KTunwOIf; 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="IXCcTG2F"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="KTunwOIf" Message-ID: <20241031154424.804147685@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1730389588; 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=fk1ptLUC33Bw0wSzd0G6hpDiLiKMBhvHROCcbCZNqe0=; b=IXCcTG2FZizq+R5JTTbIBCUmYi1XC8qP6fcIV9YUr8aoUpIVp7q9vdegqREOdkGJHjWG5P pHwL5MkInnbs0OFaqfKlrAunlJoXRD+1amrRBfSBiC28ucCH+RxfxK97i4wvR/C5GB6zpq /tSH9fi9q/AXju8pJwnf2El7orpwXT9f1FGh1G8Z7xkyC+YVAau6krkeLBCE0C6ezl/po0 BGsNOkvWpDNEi1J6sMSnCH9fA/YJoZZraukLxCmkyIm87S9FysnzsaOCKJVL8Dzte2GdIz wYoQIXH9FZzivvi/5RtcKE6X03OFeiViJOq6tRay5T97JfAeLZTmdKlg97J0bA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1730389588; 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=fk1ptLUC33Bw0wSzd0G6hpDiLiKMBhvHROCcbCZNqe0=; b=KTunwOIf5+8pqRv+cv3fENyBMgOR8K3lzWEE6D2M1kRG/EVqs+cEK1aIvCO1NVHFMe6QnC 9fJ818t8BOh3ylDw== 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 v6 04/20] posix-cpu-timers: Use dedicated flag for CPU timer nanosleep References: <20241031151625.361697424@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Thu, 31 Oct 2024 16:46:27 +0100 (CET) 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 Reviewed-by: Frederic Weisbecker Acked-by: Peter Zijlstra (Intel) --- include/linux/posix-timers.h | 2 ++ kernel/time/posix-cpu-timers.c | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-) --- --- 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 { @@ -50,6 +51,7 @@ struct cpu_timer { struct pid *pid; struct list_head elist; bool firing; + bool nanosleep; struct task_struct __rcu *handling; }; =20 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -595,7 +595,7 @@ 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. @@ -1492,6 +1492,7 @@ 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;