Re: [PATCH v5 13/16] powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX

[christophe leroy]

Le 15/06/2019 Ã 14:28, Andreas Schwab a ÃcritÂ:
> On Feb 21 2019, Christophe Leroy <christophe.leroy@xxxxxx> wrote:
>
> > diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
> > index a000768a5cc9..6e56a6240bfa 100644
> > --- a/arch/powerpc/mm/pgtable_32.c
> > +++ b/arch/powerpc/mm/pgtable_32.c
> > @@ -353,7 +353,10 @@ void mark_initmem_nx(void)
> >   	unsigned long numpages = PFN_UP((unsigned long)_einittext) -
> >   				 PFN_DOWN((unsigned long)_sinittext);
> >   
> > -	change_page_attr(page, numpages, PAGE_KERNEL);
> > +	if (v_block_mapped((unsigned long)_stext) + 1)
>
> That is always true.

Did you boot with 'nobats' kernel parameter ?

If not, that's normal to be true, it means that memory is mapped with BATs.

When you boot with 'nobats' parameter, this should return false.

Christophe

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