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SubjectRe: [PATCH] x86 NUMA panic compile error
Ingo Molnar <mingo@elte.hu> wrote:
>
>
> * Andrew Morton <akpm@osdl.org> wrote:
>
> > > (which has nothing to do with x86_64 anyway)
> >
> > True.
> >
> > I guess the concern here is that we don't want people building these
> > frankenkernels and then sending us bug reports against them.
>
> sure - lets simply turn it into a printk, as per the patch below.
>
> it's not like we are being swamped with these bugreports, it seems i was
> the only one who tried. So lets not over-react it. (and the panic was
> the worst possible thing we could do.)
>
> Ingo
>
> ---
>
> warn users that running CONFIG_NUMA on non-x440 boxes is barely tested.
>
> Signed-off-by: Ingo Molnar <mingo@elte.hu>
>
> arch/i386/kernel/srat.c | 9 +++------
> 1 file changed, 3 insertions(+), 6 deletions(-)
>
> Index: linux/arch/i386/kernel/srat.c
> ===================================================================
> --- linux.orig/arch/i386/kernel/srat.c
> +++ linux/arch/i386/kernel/srat.c
> @@ -267,12 +267,9 @@ int __init get_memcfg_from_srat(void)
> int i = 0;
>
> extern int use_cyclone;

argh.

If we didn't do this lazy-ass put-the-declaration-in-the-C-file thing, we'd
have noticed that the declaration of use_cyclone is in
include/asm-i386/mach-summit/mach_mpparse.h.

use_cyclone isn't defined if !CONFIG_X86_CYCLONE_TIMER.
arch/i386/kernel/srat.c is only compiled if X86_SUMMIT || X86_GENERICARCH.

<tries to break it>

I have a config here which has NUMA=y, ACPI_SRAT=y, X86_SUMMIT=n (and
X86_SUMMIT_NUMA=y!!) and, for some reason it set X86_CYCLONE_TIMER=y, which
is dumb. But it will manage to link with this patch applied.

But still, referencing a variable which is implemented in
arch/i386/kernel/timers/timer_cyclone.c from within arch/i386/kernel/srat.c
is asking for trouble, no?
-
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