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 22:47:47 +0200 [thread overview]
Message-ID: <20060503204747.GC15965@elte.hu> (raw)
In-Reply-To: <200604221505.k3MF5mql022083@dwalker1.mvista.com>
* Daniel Walker <dwalker@mvista.com> wrote:
> The bh_lru_lock() was set to disable interrupt to protect from
> IPI's, which are only on SMP . So I don't think it's needed in UP
> PREEMPT_RT configs.
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)
Ingo
next prev parent reply other threads:[~2006-05-03 20:42 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 [this message]
2006-05-03 20:47 ` Daniel Walker
2006-05-03 21:01 ` Ingo Molnar
2006-05-03 21:01 ` Daniel Walker
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