linux-kernel - Re: [BUGFIX]{PATCH] flush icache on ia64 take2

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Message-ID: <468E0E52.2060705@bull.net>
Date:	Fri, 06 Jul 2007 11:41:38 +0200
From:	Zoltan Menyhart <Zoltan.Menyhart@...l.net>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-ia64@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, "tony.luck@...el.com" <tony.luck@...el.com>,
	nickpiggin@...oo.com.au, mike@...oyan.net, dmosberger@...il.com,
	GOTO <y-goto@...fujitsu.com>
Subject: Re: [BUGFIX]{PATCH] flush icache on ia64 take2

KAMEZAWA Hiroyuki wrote:

>  Note1: icache flush is called only when VM_EXEC flag is on and 
>         PG_arch_1 is not set.

If you have not got the page in the cache, then the new page will
be allocated with PG_arch_1 bit off.
You are going to flush pages which are read by HW DMA, i.e. the L2I
of Montecito does not keep old lines for those pages anyway.

...->a_ops->readpage() of "L2I safe" file systems should set PG_arch_1
if the CPU is ia64 and it has got separate L2I.

On the other hand, arch. independent file systems should not play with
PG_arch_1.
The base kernel should export a macro for the file systems...

Thanks,

Zoltan Menyhart

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