linux-kernel - Re: [patch 3/4] cpu alloc: The allocator

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Message-ID: <48D3D836.40306@linux-foundation.org>
Date:	Fri, 19 Sep 2008 11:49:58 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, jeremy@...p.org, ebiederm@...ssion.com,
	travis@....com, herbert@...dor.apana.org.au, xemul@...nvz.org,
	penberg@...helsinki.fi
Subject: Re: [patch 3/4] cpu alloc: The allocator

Eric Dumazet wrote:

>> +    unsigned long start;
>> +    int units = size_to_units(size);
>> +    void *ptr;
>> +    int first;
>> +    unsigned long flags;
>> +
>> +    if (!size)
>> +        return ZERO_SIZE_PTR;
>> +
>> +    WARN_ON(align > PAGE_SIZE);
> 
> if (align < UNIT_SIZE)
>     align = UNIT_SIZE;

size_to_units() does round up:


/*
 * How many units are needed for an object of a given size
 */
static int size_to_units(unsigned long size)
{
        return DIV_ROUND_UP(size, UNIT_SIZE);
}

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