Re: [PATCH] mm: add config NUMA stub to all architectures

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Feb 17, 2012 at 21:30, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Fri, 17 Feb 2012 16:08:15 +0400
> Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> wrote:
>
>> Config NUMA must be defined for all architectures,
>> otherwise IS_ENABLED(CONFIG_NUMA) does not work.
>> Some arch-specific Kconfig already has this stub.
>> This patch adds it to all remaining.
>
> It would be better to teach IS_ENABLED() to handle this situation.  I
> don't think there's a way of doing this with cpp :(
>
> This limitation makes IS_ENABLED pretty dangerous, doesn't it?  It
> makes it very easy to introduce build breakage with unexpected Kconfig
> combinations.

Indeed. Recently I discovered IS_ENABLED() and started recommending it
to people for new code. But now I've seen the CONFIG_NUMA breakage,
I no longer think this is a good recommendation.

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
--
To unsubscribe from this list: send the line "unsubscribe linux-next" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Kernel]     [Linux USB Development]     [Yosemite News]     [Linux SCSI]

  Powered by Linux