linux-kernel - Re: [PATCH RFC v2] slab: introduce kmalloc

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Message-ID: <CACVxJT9gf0NkAuWWe02Q59HbjRB2WAJLJiRrrrFy5a46+po0eQ@mail.gmail.com>
Date:	Fri, 10 Feb 2012 15:11:28 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Xi Wang <xi.wang@...il.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Matt Mackall <mpm@...enic.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH RFC v2] slab: introduce kmalloc_array

On Fri, Feb 10, 2012 at 4:09 PM, Alexey Dobriyan <adobriyan@...il.com> wrote:
> On Thu, Feb 9, 2012 at 4:48 PM, Xi Wang <xi.wang@...il.com> wrote:
>> -static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
>> +static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
>>  {
>>        if (size != 0 && n > ULONG_MAX / size)
>>                return NULL;
>> -       return __kmalloc(n * size, flags | __GFP_ZERO);
>> +       return __kmalloc(n * size, flags);
>> +}
>
> It should be named kaalloc(), I think.
> Why it is ULONG_MAX, when size_t is used?

Also, it could be written more "robust" against people who will make
sizeof() the first argument with __builtin_constant_p().
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