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

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Message-ID: <CACVxJT92s+XptSm+aNcbhNi0ovEwT0PSSCTiq=VYsbKDRKQWdw@mail.gmail.com>
Date:	Fri, 10 Feb 2012 15:58:25 +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 4:55 PM, Xi Wang <xi.wang@...il.com> wrote:
> On Feb 10, 2012, at 8:11 AM, Alexey Dobriyan wrote:

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

No,

If one dimension is constant, limit should be divided by it, so
compiler would have less chance
to screw up compile time evaluation.

Also, gfp_t mask could be made first argument if we ever want to
expand it to >2 dimensional arrays
without adding kaalloc3().

> Do you mean something like this?
>
>  BUILD_BUG_ON(__builtin_constant_p(n));
>
> or
>
>  BUILD_BUG_ON(__builtin_constant_p(n) && !__builtin_constant_p(size));
>
> - xi
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