linux-kernel - Re: [-mm PATCH 1/8] Memory controller resource counters (v2)

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Date:	Fri, 06 Jul 2007 14:10:05 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MM Mailing List <linux-mm@...ck.org>,
	Eric W Biederman <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Paul Menage <menage@...gle.com>
Subject: Re: [-mm PATCH 1/8] Memory controller resource counters (v2)

On Fri, 2007-07-06 at 14:03 -0700, Balbir Singh wrote:
> 
> >> +ssize_t res_counter_read(struct res_counter *cnt, int member,
> >> +            const char __user *userbuf, size_t nbytes, loff_t
> *pos)
> >> +{
> >> +    unsigned long *val;
> >> +    char buf[64], *s;
> >> +
> >> +    s = buf;
> >> +    val = res_counter_member(cnt, member);
> >> +    s += sprintf(s, "%lu\n", *val);
> >> +    return simple_read_from_buffer((void __user *)userbuf, nbytes,
> >> +                    pos, buf, s - buf);
> >> +}
> > 
> > Why do we need that cast?  
> > 
> 
> u mean the __user? If I remember correctly it's a attribute for
> sparse.

The userbuf is already __user.  This just appears to be making a 'const
char *' into a 'void *'.  I wondered what the reason for that part is.

-- Dave

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