linux-kernel - Re: Uninline kcalloc

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Message-ID: <CAOJsxLEVy9AyoU56n6F066gX28b_EJ1Ue=Qz+FWMgJL43OWPag@mail.gmail.com>
Date:	Tue, 14 Feb 2012 23:31:03 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Xi Wang <xi.wang@...il.com>,
	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 Tue, 14 Feb 2012, Pekka Enberg wrote:
>> Me neither. I don't think Christoph's SAFE_ARRAY_SIZE() suggestion
>> makes much sense, really. It's more verbose, less obvious API, and
>> doesn't really deal with the overflow case cleanly.

On Tue, Feb 14, 2012 at 11:09 PM, Christoph Lameter <cl@...ux.com> wrote:
> IMHO Having a function to deal with the overflow of a multiplication and
> then do an allocation based on the result is a conflation of two different
> things that need to be separate. kcalloc only exists because there is
> an ancient user space function that somehow got a second parameter instead
> of just using the same as malloc().

It's an ancient userspace function that everybody knows how to use.
There really isn't big enough gains from SAFE_ARRAY_SIZE() to justify
a new API. And it's not as if the macro is an elegant way to solve the
problem at hand either.

                                 Pekka
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