Re: [Xen-devel] Re: Allow compile with CONFIG_DEBUG_INFO=y, X86_PAEnot set on gcc 3.4.5

[Jeremy Fitzhardinge]

Adrian Bunk wrote:
> On Fri, Aug 08, 2008 at 08:21:41AM -0700, Jeremy Fitzhardinge wrote:
>   
> > Adrian Bunk wrote:
> >     
> > > CONFIG_DEBUG_INFO=y is why I never hit it before.
> > >
> > > It does not seem to be just one dodgy Redhat compiler (as I assumed in  
> > > the Bugzilla entry) but the whole 3.4 series of gcc which makes our  
> > > resolution of saying that this specific compiler is broken invalid.
> > >
> > > Considering that we officially support all compilers >= 3.2 this is 
> > > just one more case where we have to add to the kernel a workaround for 
> > > a broken compiler.
> > >   
> > >       
> > Yes.  I'm happy to write off a specific rpm package, but a whole series  
> > is a different matter.
> >
> > Adding
> >
> > 	if (PREALLOCATED_PMDS == 0)
> > 		return;
> >
> > in the appropriate places with a small comment seems like the right answer.
> >     
>
> The patch below you suggested fixes it for me with gcc 3.4.6.
>
>   
> >    J
> >     
>
> cu
> Adrian
>   

OK.  Want to submit this as a proper patch?

Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

Thanks,
   J


> --- a/arch/x86/mm/pgtable.c
> +++ b/arch/x86/mm/pgtable.c
> @@ -209,6 +209,9 @@ static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmds[])
>  
>  	pud = pud_offset(pgd, 0);
>  
> +	if (PREALLOCATED_PMDS == 0)
> +		return;
> +
>   	for (addr = i = 0; i < PREALLOCATED_PMDS;
>  	     i++, pud++, addr += PUD_SIZE) {
>  		pmd_t *pmd = pmds[i];
>
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>   

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