From nobody Sun Feb 8 14:10:55 2026 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 5EF6D254B18 for ; Mon, 24 Feb 2025 10:15:37 +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=1740392138; cv=none; b=BEqyIunFbFR4eVtCQt5YryqLLiG/5DolbaQSQuyPyyH3nlGIICjIJcyJH7F9ghurK7jFzwoN0h6OTbOgkjGw7Tt71KA8qzlzMjj/c0n5QlAUw2+ElpRPd3LKmdnuMiDkkTOqpTrTcsAxx/S+Rf+mcdQhkvNJmHiy0JOFzXTkT9o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740392138; c=relaxed/simple; bh=z2LcqZOrO+c2z55Y2Ou512MgbA+rp3d9GPeexhEBsYM=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=LfPxNfIFp5/r6fbAsRxfWe+MTm2AXlLaQ+AG6kgVqlgIyD7uPrCKY10+0WBfiK/79BJgUKQRK6DsFKSISrAZGJxqJp+vtxTEmMmoLw7oC/PPxl0v8qIxj1w0E1B1ATjLbhATo1eQ01mkCoNpQIOtpTPM/wa8Xm4/efcZiA1kgXs= 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=CCVKzGbW; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Y4PtCWUJ; 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="CCVKzGbW"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Y4PtCWUJ" Message-ID: <20250224101343.476200215@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1740392136; 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=TgnqdEMmZ/WqLTYhEIxPYDCSyTBkXav7b/iu1bARJec=; b=CCVKzGbWMXJ7ILTK2K4HmV8q4LRuBWCnJWNP3rJt9G2XXnTHScbXfnHgIVpFeIFvIFTU37 7QZ9iyLEfv1iBzq6WapCNlN3Owwif/i32YRg64uPJYLrQeYerDIRMLaEomrP5ukQpX0IDz JRUlMJ8ekAuOrLMCPqbirZvJ6aeRrATnOw4NJmK8VJaULV2NDv8OQMdm33MSl5YKE34WgV JiXx+CYpZVTBGs/jcU0HbbwG5e341/3xAtbr+OCIsC4cRQlci7n0enjNYFu6QPpkRDMfG5 UoQsH30nHJdVfUSl2Spx5yiJrVx/eMDdGGohRxrBkVZ+EGUswkH/H0EgxyCSlQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1740392136; 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=TgnqdEMmZ/WqLTYhEIxPYDCSyTBkXav7b/iu1bARJec=; b=Y4PtCWUJAmEUOU5lxznK9LTtRCp1n0dTguuqAl/Nf0Stk1pusSu2OABnYozJx+lu57sqpc N67ZQ2hErpUdM3BQ== From: Thomas Gleixner To: LKML Cc: Anna-Maria Behnsen , Frederic Weisbecker , Benjamin Segall , Eric Dumazet , Andrey Vagin , Pavel Tikhomirov , Peter Zijlstra Subject: [patch 08/11] posix-timers: Make per process list RCU safe References: <20250224095736.145530367@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Mon, 24 Feb 2025 11:15:35 +0100 (CET) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Preparatory change to remove the sighand locking from the /proc/$PID/timers iterator. Signed-off-by: Thomas Gleixner --- kernel/time/posix-timers.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -496,7 +496,7 @@ static int do_timer_create(clockid_t whi * unmodified signal pointer to make it valid. */ WRITE_ONCE(new_timer->it_signal, current->signal); - hlist_add_head(&new_timer->list, ¤t->signal->posix_timers); + hlist_add_head_rcu(&new_timer->list, ¤t->signal->posix_timers); spin_unlock_irq(¤t->sighand->siglock); /* * After unlocking sighand::siglock @new_timer is subject to @@ -1072,7 +1072,7 @@ static int posix_timer_delete(struct k_i unsigned long sig =3D (unsigned long)timer->it_signal | 1UL; =20 WRITE_ONCE(timer->it_signal, (struct signal_struct *)sig); - hlist_del(&timer->list); + hlist_del_rcu(&timer->list); posix_timer_cleanup_ignored(timer); }