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

[christophe leroy]

Le 15/06/2019 à 14:28, Andreas Schwab a écrit :
> On Feb 21 2019, Christophe Leroy <christophe.leroy at c-s.fr> 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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