linux-kernel - Re: [PATCH 09/30] mtd: Don't cast kmalloc() return value in drivers/mtd/maps/pmcmsp-flash.c

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Message-ID: <9a8748490708251728h51d51092r11a3562ceb63b2f9@mail.gmail.com>
Date:	Sun, 26 Aug 2007 02:28:42 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
Cc:	"Denys Vlasenko" <vda.linux@...glemail.com>,
	"David Woodhouse" <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/30] mtd: Don't cast kmalloc() return value in drivers/mtd/maps/pmcmsp-flash.c

On 26/08/07, Robert P. J. Day <rpjday@...dspring.com> wrote:
> On Sun, 26 Aug 2007, Jesper Juhl wrote:
>
> > On 24/08/07, Robert P. J. Day <rpjday@...dspring.com> wrote:
>
> > > actually, i would think kcalloc would be more appropriate here, no?
> > >
> >
> > Why?
> >
> > msp_parts[i] = kzalloc(pcnt * sizeof(struct mtd_partition), GFP_KERNEL);
> >
> > seems better to me than
> >
> > msp_parts[i] = kcalloc(1, pcnt * sizeof(struct mtd_partition), GFP_KERNEL);
>
> i was thinking more along the lines of
>
> msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition), GFP_KERNEL);
>
> which was kind of the obvious implication, no?

I guess

> unless there's a
> reason kcalloc() wouldn't work here, this is pretty much what
> kcalloc() was designed for.
>
When Denys brought up the zeroing thing and mentioned kzalloc() I did
consider kcalloc() instead, but kzalloc() makes this allocation nicely
look like the preceding ones visually and I couldn't convince myself
that kcalloc() would give us any real benefit here.

What exactely would using kcalloc() over kzalloc() here buy us?

-- 
Jesper Juhl <jesper.juhl@...il.com>
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