[Devel] Re: [PATCH 2/6] BC: beancounters core (API)

[Andrew Morton]

On Thu, 24 Aug 2006 16:06:11 +0400
Kirill Korotaev <dev at sw.ru> wrote:

> >>+#define bc_charge_locked(bc, r, v, s)			(0)
> >>> +#define bc_charge(bc, r, v)				(0)
> >
> >akpm:/home/akpm> cat t.c
> >void foo(void)
> >{
> >	(0);
> >}
> >akpm:/home/akpm> gcc -c -Wall t.c
> >t.c: In function 'foo':
> >t.c:4: warning: statement with no effect
> 
> these functions return value should always be checked (!).

We have __must_check for that.

> i.e. it is never called like:
>   ub_charge(bc, r, v);

Also...

	if (bc_charge(tpyo, undefined_variable, syntax_error))

will happily compile if !CONFIG_BEANCOUNTER.

Turning these stubs into static inline __must_check functions fixes all this.