linux-kernel - Re: [PATCH] mm: Don't forget to set softdirty on file mapped fault

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Date:	Tue, 8 Jul 2014 23:28:29 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: Don't forget to set softdirty on file mapped fault

On 07/08/2014 11:21 PM, Cyrill Gorcunov wrote:
> Otherwise we may not notice that pte was softdirty because pte_mksoft_dirty
> helper _returns_ new pte but not modifies argument.
> 
> CC: Pavel Emelyanov <xemul@...allels.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>

Acked-by: Pavel Emelyanov <xemul@...allels.com>

> ---
>  mm/memory.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6.git/mm/memory.c
> ===================================================================
> --- linux-2.6.git.orig/mm/memory.c
> +++ linux-2.6.git/mm/memory.c
> @@ -2744,7 +2744,7 @@ void do_set_pte(struct vm_area_struct *v
>  	if (write)
>  		entry = maybe_mkwrite(pte_mkdirty(entry), vma);
>  	else if (pte_file(*pte) && pte_file_soft_dirty(*pte))
> -		pte_mksoft_dirty(entry);
> +		entry = pte_mksoft_dirty(entry);
>  	if (anon) {
>  		inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
>  		page_add_new_anon_rmap(page, vma, address);
> .
> 

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