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

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Message-Id: <57269901-FC81-4276-818E-4C996C5C902A@gmail.com>
Date:	Tue, 14 Feb 2012 06:12:06 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesper Juhl <jj@...osbits.net>, Jens Axboe <axboe@...nel.dk>,
	Pekka Enberg <penberg@...nel.org>,
	linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH RFC v2] slab: introduce kmalloc_array

On Feb 14, 2012, at 2:20 AM, Dan Carpenter wrote:
> I really think that's over thinking things.  Let's just match
> kcalloc() exactly except without zeroing.  The BUILD_BUG_ON() thing
> is an over complication as well.  We haven't needed it for
> kcalloc().

I don't think the BUILD_BUG_ON macro is useful here nor in kcalloc
(besides gcc won't give you much handy information).

Just matching the new non-zeroing array allocator with kcalloc seems
like the right thing to do.  We had quite a few patches that could
be simpler with it.  For now I don't feel like it's necessary to
change the API (e.g., making gfp_t as the first argument), do "smart"
optimizations (e.g., recognizing the first argument is a constant),
nor add more allocators (e.g., to match vmalloc, kmalloc_node).

- xi
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