linux-kernel - Re: [PATCH 1/2] mm: implement remap_pfn_range with apply_to_page

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Date:	Thu, 13 Nov 2008 12:12:16 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH 1/2] mm: implement remap_pfn_range with apply_to_page_range

Johannes Weiner wrote:
>> -	do {
>> -		BUG_ON(!pte_none(*pte));
>>     
>
> Dropping by intention?
>   

Hm, I couldn't really see the point.   But I didn't really want to 
introduce any functional changes with this patch, so I'll add it back.

>> 	BUG_ON(addr >= end);
>> -	pfn -= addr >> PAGE_SHIFT;
>> -	pgd = pgd_offset(mm, addr);
>> -	flush_cache_range(vma, addr, end);
>>     
>
> Was the flushing redundant?  I can't spot it reappearing anywhere.

I guess its needed for virtually indexed cache architectures; I'll add 
it back.

Thanks for reviewing.

    J
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