linux-kernel - Re: [PATCH] ia64: Avoid unnecessary TLB flushes when allocating memory

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Date:	Tue, 18 Dec 2007 10:05:45 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"de Dinechin, Christophe (Integrity VM)" 
	<christophe.de-dinechin@...com>
Cc:	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Picco, Robert W." <robert.picco@...com>,
	"tony.luck@...el.com" <tony.luck@...el.com>
Subject: Re: [PATCH] ia64: Avoid unnecessary TLB flushes when allocating
 memory

On Thu, 13 Dec 2007 15:03:07 +0000

> +       if (mm != active_mm) {
> +               /* Restore region IDs for mm */
> +               if (mm && active_mm) {
> +                       activate_context(mm);
> +               } else {
> +                       flush_tlb_all();
> +                       return;
> +               }
>         }
should be 

preempt_disable();
activate_context(mm);
preempt_enable();

?
(from comments for activate_context()).


Thanks,
-Kame

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