On Mon, 2010-08-23 at 07:48 -0400, Brian Gerst wrote:
>
> Use an exported function pointer in the main kernel as a hook that the
> module sets when it is loaded. Note, you must use module_get and
> module_put around the call to the module to prevent it from unloading
> while in use.
Please don't do any such thing, its impossible to use correctly.
Suppose there are two modular users, A and B.
Both have something like:
extern void (*fptr)(void);
static void (*old_fptr)(void);
static void func(void)
{
/* foo */
if (old_fptr)
old_fptr();
}
module_init()
{
old_fptr = fptr;
fptr = A_func;
}
Then you load A, load B and unload A, then guess what happens?
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