linux-kernel - Re: [PATCH] flush icache before set

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Message-Id: <20070731092928.c6da9f25.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 31 Jul 2007 09:29:28 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Zoltan Menyhart <Zoltan.Menyhart@...l.net>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	"nickpiggin@...oo.com.au" <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH] flush icache before set_pte() take 5.

On Mon, 30 Jul 2007 16:30:50 +0200
Zoltan Menyhart <Zoltan.Menyhart@...l.net> wrote:

> KAMEZAWA Hiroyuki wrote:
> 
> > Considerations:
> >   - I can add CONFIG_MONTECITO if necessary. But it will be confusing, I think.
> 
> What about this trick below?
> 
> identify_cpu() finds out the "c->family".
> If any of the CPUs has c->family==32 (and the future versions...) then
> set a global flag. And:
> 
> static inline void sync_icache_dcache(pte_t pte) {
>         if (pte_exec(pte) && global_flag)
>                 __sync_icache_dcache(pte);
> }
> 
Hmm...maybe better for old cpus even if cache miss occurs here.
I'll add add-on patch in take6.

Thanks,
-Kame

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