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

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Message-Id: <20120209150856.7f97d28e.akpm@linux-foundation.org>
Date:	Thu, 9 Feb 2012 15:08:56 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Xi Wang <xi.wang@...il.com>, Jens Axboe <axboe@...nel.dk>,
	Pekka Enberg <penberg@...nel.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH RFC v2] slab: introduce kmalloc_array

On Thu, 9 Feb 2012 14:42:49 -0800 (PST)
David Rientjes <rientjes@...gle.com> wrote:

> On Thu, 9 Feb 2012, Xi Wang wrote:
> 
> > This patch introduces a kmalloc_array() wrapper that performs integer
> > overflow checking without zeroing the memory.
> > 
> > Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> > Suggested-by: Jens Axboe <axboe@...nel.dk>
> > Signed-off-by: Xi Wang <xi.wang@...il.com>
> 
> Acked-by: David Rientjes <rientjes@...gle.com>
> 
> assuming there's at least one new user or one existing user that can be 
> modified to use the new interface and this won't just sit around not being 
> used.

The need is there - I've whined about the absence of kmalloc_array()
maybe 3 times in the past year.

Often kcalloc() is suitable - quite a lot of arrays which are sized
based on a userspace-provided dimension are also zeroed out.  For some
reason.

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