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

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Date:	Mon, 30 Jul 2007 16:30:50 +0200
From:	Zoltan Menyhart <Zoltan.Menyhart@...l.net>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
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.

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);
}

Thanks,

Zoltan
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