Re: [PATCH 3/5] perf_counter: rework ioctl()s

[Paul Mackerras]

Peter Zijlstra writes:

> Hmm, are you saying that the 3rd argument to unlocked_ioctl is actually
> (void __user *) instead of unsigned long?

He's saying (correctly) that using _IOR or _IOW implies that the ioctl
is going to read or write the memory location pointed to by the 3rd
argument to unlocked_ioctl.  If the 3rd argument is just a number, not
an address, I believe you should use _IO.

Paul.
--
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/