Re: [PATCH 1/1] x86: fix text_poke

[Jiri Slaby]

On 04/26/2008 11:59 AM, Andi Kleen wrote:
> On Fri, Apr 25, 2008 at 12:36:33PM -0700, Christoph Lameter wrote:
> > On Fri, 25 Apr 2008, Andi Kleen wrote:
> >
> > > > And we should really add a lot more sanity checking there.
> > > A debug mode for virt_to_page(),__pa,__va et.al. would probably make sense
> > > and would have caught it.
> > >
> > > I used to have that partly in the x86-64 port with VIRTUAL_BUG_ON.
> > Good idea! Do you have a patch?
>
> Yes. Appended. But it just enables the old NUMA VIRTUAL_BUG_ON()s, more 
> work could be done e.g. by instrumenting pa/va and the non NUMA and i386 
> case too.

Is anybody working on that? I would volunteer to do it.

> --- linux.orig/include/asm-x86/mmzone_64.h
> +++ linux/include/asm-x86/mmzone_64.h
> @@ -7,7 +7,11 @@
>  
>  #ifdef CONFIG_NUMA
>  
> +#ifdef CONFIG_DEBUG_VIRTUAL
> +#define VIRTUAL_BUG_ON(x) BUG_ON(x)
> +#else
>  #define VIRTUAL_BUG_ON(x)
> +#endif
>  
>  #include <asm/smp.h>
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