Re: 2.4.0-test10-pre6: Use of abs()

Martin Dalecki
2000-10-30T13:07:38Z

Horst von Brand wrote:
>
> Red Hat 7.0, i686, gcc-20001027 (Yes, I know. Just to flush out bugs on
> both sides).
>
> abs() is used at least in:
>
> arch/i386/kernel/time.c
> drivers/md/raid1.c
> drivers/sound/sb_ess.c
>
> gcc warns about use of a non-declared function each time.
>
> No definition for the function is to be found (grep over all include/ comes
> up clean, except for extern definitions in asm-{mips,ppc}; ditto for lib/).
> Presumably gcc is using a builtin (it doesn't show up in System.map). Is
> this the desired state of affairs? Should a include/linux/stdlib.h be

Yes abs will be transformed into an internal function, which will be
fully
unrolled due to -O2.