From: Ingo Molnar <mingo@elte.hu>
To: Daniel Walker <dwalker@mvista.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH -rt] revert bh_lru_lock() to preempt_disable()
Date: Wed, 3 May 2006 23:01:25 +0200 [thread overview]
Message-ID: <20060503210125.GB16696@elte.hu> (raw)
In-Reply-To: <1146689257.3363.13.camel@localhost.localdomain>
* Daniel Walker <dwalker@mvista.com> wrote:
> > i agree that this is a problem, but the fix is incorrect. What would be
> > the right approach is to convert the PER_CPU bh_lrus to PER_CPU_LOCKED,
> > and to use the appropriate primitives to use them. That automatically
> > makes this code rt-safe. (it isnt right now)
>
> Hmm, in UP it should be safe to access per cpu data under either a
> preempt_disable or local_irq_disable . I'm not sure how RT changes
> that .. Is there some other part of the code that isn't rt-safe, which
> I've overlooked ?
hm, you are right - that code can be in a preempt-off section. I've
applied your patch.
Ingo
next prev parent reply other threads:[~2006-05-03 20:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-22 15:05 [PATCH -rt] revert bh_lru_lock() to preempt_disable() Daniel Walker
2006-05-03 20:47 ` Ingo Molnar
2006-05-03 20:47 ` Daniel Walker
2006-05-03 21:01 ` Ingo Molnar [this message]
2006-05-03 21:01 ` Daniel Walker
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