linux-kernel - Re: [PATCH] flush cache fixes for ia64 [2/2] sync icache dcache

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Date:	Fri, 27 Jul 2007 16:16:27 +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 cache fixes for ia64 [2/2] sync icache dcache

Do you really need a "sync_icache_dcache()" in "do_wp_page()"?
I guess it is only needed when the EXEC bit of the PTE gets turned on.

> --- linux-2.6.23-rc1.test.orig/mm/migrate.c
> +++ linux-2.6.23-rc1.test/mm/migrate.c
> @@ -172,6 +172,7 @@ static void remove_migration_pte(struct 
>  	pte = pte_mkold(mk_pte(new, vma->vm_page_prot));
>  	if (is_write_migration_entry(entry))
>  		pte = pte_mkwrite(pte);
> +	flush_icache_page(vma, new);
>  	set_pte_at(mm, addr, ptep, pte);
>  
>  	if (PageAnon(new))

I think "flush_icache_page()", or rather "flush_cache_page()" is
to be placed where migration tears down the old virtual --> physical
address translation for good.

> --- linux-2.6.23-rc1.test.orig/mm/migrate.c
> +++ linux-2.6.23-rc1.test/mm/migrate.c
> @@ -173,6 +173,7 @@ static void remove_migration_pte(struct 
>  	if (is_write_migration_entry(entry))
>  		pte = pte_mkwrite(pte);
>  	flush_icache_page(vma, new);
> +	sync_icache_dcache(pte);
>  	set_pte_at(mm, addr, ptep, pte);

Sure, I can agree to add "sync_icache_dcache()" here.

Thanks,

Zoltan
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