linux-kernel - Re: [PATCH 3/5] metag: hugetlb: convert to vm_unmapped

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Date:	Fri, 15 Feb 2013 09:26:59 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	<linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 3/5] metag: hugetlb: convert to vm_unmapped_area()

On 15/02/13 08:04, Michel Lespinasse wrote:
> On Wed, Feb 13, 2013 at 4:03 AM, James Hogan <james.hogan@...tec.com> wrote:
>> Convert hugetlb_get_unmapped_area_new_pmd() to use vm_unmapped_area()
>> rather than searching the virtual address space itself. This fixes the
>> following errors in linux-next due to the specified members being
>> removed after other architectures have already been converted:
>>
>> arch/metag/mm/hugetlbpage.c: In function 'hugetlb_get_unmapped_area_new_pmd':
>> arch/metag/mm/hugetlbpage.c:199: error: 'struct mm_struct' has no member named 'cached_hole_size'
>> arch/metag/mm/hugetlbpage.c:200: error: 'struct mm_struct' has no member named 'free_area_cache'
>> arch/metag/mm/hugetlbpage.c:215: error: 'struct mm_struct' has no member named 'cached_hole_size'
>>
>> Signed-off-by: James Hogan <james.hogan@...tec.com>
>> Cc: Michel Lespinasse <walken@...gle.com>
> 
> Looks good. Just one thing, which I don't have full context to evaluate:
> 
>> +       info.align_mask = PAGE_MASK & HUGEPT_MASK;
> 
> This will work only if HUGEPT_MASK == HUGEPT_SIZE - 1, as opposed to
> the PAGE_MASK definition which is ~(PAGE_SIZE - 1).
> Not sure how HUGEPT_MASK is defined, so please double check that.
> 
> Acked-by: Michel Lespinasse <walken@...gle.com>
> 

Thanks Michel. HUGEPT_MASK is indeed equal to HUGEPT_SIZE - 1. I
originally did info.align_mask = PAGE_MASK & ~HUGEPT_MASK accidentally
and as you say it just didn't work :)

Cheers
James

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