linux-kernel - Re: [PATCH 7/8] mm: use vm_unmapped

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Message-ID: <50EDE403.4070208@redhat.com>
Date:	Wed, 09 Jan 2013 16:41:23 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Matt Turner <mattst88@...il.com>,
	David Howells <dhowells@...hat.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-parisc@...r.kernel.org,
	linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org
Subject: Re: [PATCH 7/8] mm: use vm_unmapped_area() on powerpc architecture

On 01/09/2013 06:23 AM, Michel Lespinasse wrote:
> On Wed, Jan 09, 2013 at 02:32:56PM +1100, Benjamin Herrenschmidt wrote:
>> Ok. I think at least you can move that construct:
>>
>> +               if (addr < SLICE_LOW_TOP) {
>> +                       slice = GET_LOW_SLICE_INDEX(addr);
>> +                       addr = (slice + 1) << SLICE_LOW_SHIFT;
>> +                       if (!(available.low_slices & (1u << slice)))
>> +                               continue;
>> +               } else {
>> +                       slice = GET_HIGH_SLICE_INDEX(addr);
>> +                       addr = (slice + 1) << SLICE_HIGH_SHIFT;
>> +                       if (!(available.high_slices & (1u << slice)))
>> +                               continue;
>> +               }
>>
>> Into some kind of helper. It will probably compile to the same thing but
>> at least it's more readable and it will avoid a fuckup in the future if
>> somebody changes the algorithm and forgets to update one of the
>> copies :-)
>
> All right, does the following look more palatable then ?
> (didn't re-test it, though)

Looks equivalent. I have also not tested :)

> Signed-off-by: Michel Lespinasse <walken@...gle.com>

Acked-by: Rik van Riel <riel@...hat.com>

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