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

[Balbir Singh]

Dave Hansen wrote:
> 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.
> 

Aah.. yes.. good point. I'll look into it.

> -- Dave
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@xxxxxxxxxx  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>


-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/