Re: [PATCH] kbuild: provide include/asm/asm-prototypes.h for ARM

[Geert Uytterhoeven]

Hi Russell,

On Thu, Oct 20, 2016 at 10:20 AM, Russell King - ARM Linux
<linux@xxxxxxxxxxxxxxx> wrote:
> On Thu, Oct 20, 2016 at 09:37:30AM +0200, Geert Uytterhoeven wrote:
>> On Wed, Oct 19, 2016 at 5:32 PM, Russell King - ARM Linux
>> <linux@xxxxxxxxxxxxxxx> wrote:
>> > I'm not in favour of this.
>> >
>> >    +extern void mmioset(void *, unsigned int, size_t);
>> >    +extern void mmiocpy(void *, const void *, size_t);
>> >    +
>> >     #ifndef __ARMBE__
>> >     static inline void memset_io(volatile void __iomem *dst, unsigned c,
>> >            size_t count)
>> >     {
>> >    -       extern void mmioset(void *, unsigned int, size_t);
>> >            mmioset((void __force *)dst, c, count);
>> >     }
>> >
>> > The reason they're declared _within_ memset_io() is to prevent people
>> > from using them by hiding their declaration.  Moving them outside is
>> > an open invitation to stupid people starting to use them as an "oh it
>> > must be an official API".
>>
>> If they're not intended for public use, they should (also) be prefixed
>> with "__" or even "____" to make this clear.
>
> Tried that with the __cpuc_* cache flushing interfaces.  It doesn't
> have any effect what so ever.

it may not stop the deliberate abuser, but it hints the casual reviewer.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds