On Mon, Jul 23, 2007 at 09:22:14AM -0700, Luck, Tony wrote:
> Checking for section mismatches across all of vmlinux is kicking
> out a bunch of new warnings. Many of them real, but I have a
> few from routines like this:
>
> foo(...)
> {
> static int first_time = 1;
>
> if (first_time) {
> all_i_need = alloc_bootmem(NR_CPUS * xxx);
> first_time = 0;
> }
> ... use smp_processor_id() to use pre-allocated memory ...
> }
>
>
> Now this is safe, since the first call to foo is made when alloc_bootmem
> is still available. But it kicks out a "Section mismatch" warning since
> a non __init routine (foo) is calling an __init one.
>
> Any suggestions on how to tell modpost that this is safe?
Best way is to use __init_refok like this:
/*
* Call an __init function only first time as guarded by first_time.
* Teach modpost that this is OK.
*/
void __init_refok foo()
{
if (first_time) {
all_i_need = alloc_bootmem(NR_CPUS * xxx);
first_time = 0;
}
}
Sam
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