From mboxrd@z Thu Jan 1 00:00:00 1970 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 0BB781F03F1 for ; Sun, 2 Mar 2025 19:37:09 +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=1740944230; cv=none; b=WOPG3jwQA11ii0q7eJw43zCKYk3imPmnQgJ8GvMyHeNWPARbwZSUOpW07O++xN/nOJ+uWNuOdQ+aEAhkTHe6He32KjIGzftBBmZMmYy0ipxwtZVYWN3rCDNq4MdjfcWsi+JS9bakGqnA8WyQYBmG83ylXec5CFQlfHGj8+6DQ68= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740944230; c=relaxed/simple; bh=qXpFVgf2+2JUiKQvdmuu5fwT++cRBSrieXNRvQPzQzY=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=EyK2dwZEim+jTqJmtyu/5cwMzu3ini+vIDXigH6nzvFBH/lSHA+GOEixhBO/Yw3mxGkmkaRASk2j3GM/SelYwDoI1eZ9cbF9KFb3VmM0TZv0hNl+tF6JcgKJmV2lxOQr2LMYd46CP8q9JfLI9bY33JRGDbXhf49TDn+VI02vLY8= 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=W+VJcNjO; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=5RuDy35z; 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="W+VJcNjO"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="5RuDy35z" Message-ID: <20250302193627.792792199@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1740944227; 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=0n0+ojMJFh6Wn1lejikAH+TEQYW3S7ZwZSQhOekwXGE=; b=W+VJcNjOl96kL1LOMW29kgMDXo+XSY/5uqaskBojo3AdeAYXw4zyADdfQZ0VubCl1s+lxO rjqagKrdCT2gVmPx57+70sm1MUkTlIJy5F1/dNr7529obxiMtI+lF78jvuqNuPIse7RZou /F2KSRq29IH9WATs7lB1QfZykCd/XhlgpnTLwNPyNDv/Ne3t2kxJaQdMwd4KICYqNlKuDg MKZLnhR9q64uNnpRKJ4qBBzL4HKWYuMhe+FFLmSYnMDdp0rB9q3ckeFW/+GqOjE1YbjSE/ qNov+TG0duFFsXLOJ17hXwcHiS3gjpH0CdztVBn1vB4zP8Ww4wYoaBWGo06x1g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1740944227; 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=0n0+ojMJFh6Wn1lejikAH+TEQYW3S7ZwZSQhOekwXGE=; b=5RuDy35zjS3mb33wZ+tNxQnuhHXQ9IK0/USfvBLcNkb9bUHaf6NBQGM35AlGFuWPx5HoCf 08FrJHcslLjqEsCw== From: Thomas Gleixner To: LKML Cc: Anna-Maria Behnsen , Frederic Weisbecker , Benjamin Segall , Eric Dumazet , Andrey Vagin , Pavel Tikhomirov , Peter Zijlstra Subject: [patch V2 14/17] posix-timers: Make per process list RCU safe References: <20250302185753.311903554@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Date: Sun, 2 Mar 2025 20:37:07 +0100 (CET) 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 @@ -510,7 +510,7 @@ 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); } /* * After unlocking sighand::siglock @new_timer is subject to @@ -996,7 +996,7 @@ static void posix_timer_delete(struct k_ unsigned long sig = (unsigned long)timer->it_signal | 1UL; WRITE_ONCE(timer->it_signal, (struct signal_struct *)sig); - hlist_del(&timer->list); + hlist_del_rcu(&timer->list); posix_timer_cleanup_ignored(timer); }