linux-kernel - Re: [RT PATCH 2/3] hrtimer: Don't grab the expiry lock for non-soft hrtimer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190821134946.iyzfxv63mvhhqxox@linutronix.de>
Date:   Wed, 21 Aug 2019 15:49:46 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Julien Grall <julien.grall@....com>
Cc:     linux-rt-users@...r.kernel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, maz@...nel.org, rostedt@...dmis.org
Subject: Re: [RT PATCH 2/3] hrtimer: Don't grab the expiry lock for non-soft
 hrtimer

On 2019-08-21 10:24:08 [+0100], Julien Grall wrote:
> diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
> index b869e816e96a..119414a2f59c 100644
> --- a/kernel/time/hrtimer.c
> +++ b/kernel/time/hrtimer.c
> @@ -934,7 +934,7 @@ void hrtimer_grab_expiry_lock(const struct hrtimer *timer)
>  {
>  	struct hrtimer_clock_base *base = READ_ONCE(timer->base);
>  
> -	if (base && base->cpu_base) {
> +	if (timer->is_soft && base && base->cpu_base) {
>  		spin_lock(&base->cpu_base->softirq_expiry_lock);
>  		spin_unlock(&base->cpu_base->softirq_expiry_lock);
>  	}

right, much simpler.

Sebastian