linux-kernel - Re: [PATCH] flush icache before set_pte() on ia64 take9 [2/2] flush icache at set

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Message-ID: <ed5aea430708101146w3c08b499g99317930c7ecbd79@mail.gmail.com>
Date:	Fri, 10 Aug 2007 12:46:36 -0600
From:	"David Mosberger-Tang" <dmosberger@...il.com>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	linux-ia64@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	davem@...emloft.net, Zoltan.Menyhart@...l.net,
	nickpiggin@...oo.com.au
Subject: Re: [PATCH] flush icache before set_pte() on ia64 take9 [2/2] flush icache at set_pte

On 8/10/07, Luck, Tony <tony.luck@...el.com> wrote:

> +       if (pte_exec(pteval) &&    // flush only new executable page.
> +           pte_present(pteval) && // swap out ?
> +           pte_user(pteval) &&    // ignore kernel page
> +           (!pte_present(*ptep) ||// do_no_page or swap in, migration,
> +               pte_pfn(*ptep) != pte_pfn(pteval))) // do_wp_page(), page copy
> +               /* load_module() calles flush_icache_range() explicitly*/
> +               __ia64_sync_icache_dcache(pteval);
>

> So now the only remaining task is to convince myself that this
> new version covers all the cases.

What about code-size?

Also, is it OK to call a function from all places where a set_pte() is
being done?  I'd hope so, but it's a really low-level operation...

  --david
-- 
Mosberger Consulting LLC, http://www.mosberger-consulting.com/
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