linux-kernel - Re: Uninline kcalloc

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Message-ID: <alpine.DEB.2.00.1202151324060.28225@router.home>
Date:	Wed, 15 Feb 2012 13:34:11 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Xi Wang <xi.wang@...il.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Jesper Juhl <jj@...osbits.net>, Jens Axboe <axboe@...nel.dk>,
	linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: Uninline kcalloc

On Wed, 15 Feb 2012, Xi Wang wrote:

> for overflow, one has to write:
>
>         size_t s = calculate_array_size(n, size);
>         if (s)
>                 p = kmalloc(s, ...);
>
> This "if" thing is just too verbose --- you need three lines to
> allocate an array.
>
> We could change calculate_array_size() to return ULONG_MAX or some
> large number with which kmalloc() would fail.  Then one would write:

Any allocation larger than MAX_ORDER << PAGE_SHIFT will fail since the
page allocator cannot serve larger contigous pages.


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