linux-kernel - Re: [PATCH] netpoll: Fix carrier detection for drivers that are using phylib

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Message-Id: <1247151079.12784.10.camel@twins>
Date:	Thu, 09 Jul 2009 16:51:19 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Anton Vorontsov <avorontsov@...mvista.com>,
	Andrew Morton <akpm@...ux-foundation.org>, oleg@...hat.com,
	mingo@...e.hu, linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netpoll: Fix carrier detection for drivers that are
 using phylib

On Thu, 2009-07-09 at 09:43 -0500, Matt Mackall wrote:

> Yeah, that's what I had in mind. Probably throw in a define:
> 
> /* for disabling scheduling in early boot */
> #define PREEMPT_EARLY (1 + PREEMPT_ACTIVE)
> 
> and slap a comment on the sub_preempt_count().

Right, and visit all the other arch init code ;-)

I'll wait to see if Ingo has anything to say about it and then complete
this thing.

> Does anything actually use scheduler_running yet? Perhaps my tree is
> old.

# git grep scheduler_running
kernel/sched.c:static __read_mostly int scheduler_running;
kernel/sched.c: scheduler_running = 1;
kernel/sched_rt.c:      if (unlikely(!scheduler_running))
kernel/sched_rt.c:      if (unlikely(!scheduler_running))

If memory serves there used to be more, but I think that migrated into
kernel/sched_clock.c, which has sched_clock_running.

> Also, might_sleep's use of system_state probably bears revisiting.

Yeah, all that code is from long before we had scheduler_running (which
was introduced around CFS/.23).

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