linux-kernel - Re: Distributed storage release.

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Message-ID: <84144f020810130644w7f89f3d9m3c3d3e63d3034534@mail.gmail.com>
Date:	Mon, 13 Oct 2008 16:44:28 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Evgeniy Polyakov" <johnpol@....mipt.ru>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: Distributed storage release.

Hi Evgeniy,

On Mon, Oct 13, 2008 at 4:38 PM, Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
>> > +static void *dst_crypto_thread_init(void *data)
>> > +{
>> > +   struct dst_node *n = data;
>> > +   struct dst_crypto_engine *e;
>> > +   int err = -ENOMEM;
>> > +
>> > +   e = kzalloc(sizeof(struct dst_crypto_engine), GFP_KERNEL);
>> > +   if (!e)
>> > +           goto err_out_exit;
>> > +   e->src = kzalloc(sizeof(struct scatterlist) * 2 * n->max_pages,
>> > +                   GFP_KERNEL);
>>
>> kcalloc()?
>
> What's the difference? In saving one space and replacing another with
> comma? I do not particulary care, but would like to know why it is
> needed :)

kcalloc() will check for multiplication overflow which is nice
especially if size is passed from user-space (not sure if that applies
here).
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