linux-kernel - Re: [PATCH 07/10] bootmem: add free_bootmem

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Date:	Mon, 9 Nov 2009 22:21:48 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-kernel@...r.kernel.org, chrisw@...s-sol.org,
	dwmw2@...radead.org, joerg.roedel@....com, mingo@...e.hu,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 07/10] bootmem: add free_bootmem_late

On Mon, Nov 9, 2009 at 10:13 PM, Pekka Enberg <penberg@...helsinki.fi> wrote:
>>        for (cursor = start; cursor < end; cursor += BITS_PER_LONG) {
>> -               unsigned long idx, vec;
>> +               unsigned long vec;
>>
>> -               idx = cursor - start;
>> -               vec = ~map[idx / BITS_PER_LONG];
>> +               if (map) {
>> +                       unsigned long idx = cursor - start;
>> +                       vec = ~map[idx / BITS_PER_LONG];
>> +               } else {
>> +                       if (end - cursor >= BITS_PER_LONG)
>> +                               vec = ~0UL;
>
> Why do we need the above?

OK, I figured that out. I'm not sure why you want to play tricks with
"vec" when you could just add a new helper that calls
__free_pages_bootmem() for the full contiguous page range.

                                Pekka
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