invalid lvalue in unary '&' ... why? LKM
- From: "bob" <opster81@xxxxxxxxxxx>
- Date: 26 Jan 2006 08:30:21 -0800
I have little C experience and am concurrently trying to tackle C and
LKM's (a little too ambitious maybe) anyway here is the problem I'm
having with an example module I found.
/*
* hello-5.c
*/
.
.
static int myintArray[2] = { -1, -1 };
static int arr_argc = 0;
.
.
.
/*module _param_array(name, type, num, perm);
*the first argument in the arrays name
* the second argument is the arrays data type
* The third argument is a pointer to the variable that will
store the number
* of elements of the array initialized by the user at module
loading time
*the fourth argument is the permission bits
*/
module_param_array(myintArray, int, &arr_argc, 0000);
MODULE_PARM_DESC(myintArray, "an array of integers");
.
.
When I compile I get this error :
invalid lvalue in unary '&'
initializer element is not constant
(near initialization for '__param_arr_myintArray.num')
If I get rid of the address operator it will compile, but this doesn't
seem right - as in how the macro was designed to work. I think
module_param_array() is suppose to set the num parameter to the
number of array elements the user supplied at the invocation
of insmod. So if i say:
insmod hello-5.ko myintArray = 42
and printk the arr_argc variable I should see
arr_argc = 1
by getting rid of the address operator, I believe I am ignoring num via
NULL
All the errors point to the same line (49, module_par.....).
If you go to www.tldp.org/LDP/lkmpg/2.6/html/x323.html you can see the
whole example module.
Thanks in advance
.
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