Re: [PATCH] kernel/param.c: don't use .max when .num is NULL in param_array_set()

[Bert Wesarg <wesarg@informatik.uni-halle.de>]

On Tue, 29 Mar 2005, Rusty Russell wrote:

> On Sun, 2005-03-27 at 14:57 +0200, Bert Wesarg wrote:
> > Hello,
> >
> > there seems to be a bug, at least for me, in kernel/param.c for arrays
> > with .num == NULL. If .num == NULL, the function param_array_set() uses
> > &.max for the call to param_array(), wich alters the .max value to the
> > number of arguments. The result is, you can't set more array arguments as
> > the last time you set the parameter.
>
> Yes.  But this ignores the larger problem, in that the printing routines
> need *some* way of telling how many to print.  We could add a new
> element for this case, at the price of enlarging the structure a little
> for every array parameter.  I think you'll find that with your patch,
> the code does this:
>
> 	$ insmod example.ko array=1,2,3
> 	$ cat /sys/module/example/parameters/array
> 	1,2,3,0,0,0,0,0,0,0

Yes, but in this case you can/will past a num pointer to
module_param_array(), when it is important to know how many arguments are
specified.

greetings,
bert

>
> Cheers,
> Rusty.
> --
> A bad analogy is like a leaky screwdriver -- Richard Braakman
>