From: Domen Puncer <domen@coderock.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: janitor@sternwelten.at, akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: kernel/sched.c: fix subtle TASK_RUNNING compare
Date: Sat, 20 Nov 2004 13:07:23 +0100 [thread overview]
Message-ID: <20041120120722.GA3826@masina.coderock.org> (raw)
In-Reply-To: <20041120125355.GB8091@elte.hu>
On 20/11/04 13:53 +0100, Ingo Molnar wrote:
>
> * janitor@sternwelten.at <janitor@sternwelten.at> wrote:
>
> > switch_count = &prev->nivcsw;
> > - if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
> > + if (prev->state != TASK_RUNNING &&
> > + !(preempt_count() & PREEMPT_ACTIVE)) {
> > switch_count = &prev->nvcsw;
>
> nack. We inherently rely on the process state mask being a bitmask and
> TASK_RUNNING thus being zero.
Hmm... but other compares in sched.c are ok? ;-)
1211: BUG_ON(p->state != TASK_RUNNING);
2550: if (unlikely(current == rq->idle) && current->state != TASK_RUNNING) {
3609: if (state == TASK_RUNNING)
3640: if (state != TASK_RUNNING)
Well, it just looks more readable to me. But i don't have too strong
feelings about this. :-)
Domen
next prev parent reply other threads:[~2004-11-20 12:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-20 2:29 [patch 3/8] kernel/sched.c: fix subtle TASK_RUNNING compare janitor
2004-11-20 12:53 ` Ingo Molnar
2004-11-20 12:07 ` Domen Puncer [this message]
2004-11-20 16:40 ` Ingo Molnar
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