Re: [PATCH v3 03/21] arm64: pgtable: add dummy pud_index() and pmd_index() definitions

[Ard Biesheuvel]

On 11 January 2016 at 18:40, Mark Rutland <mark.rutland@xxxxxxx> wrote:
> On Mon, Jan 11, 2016 at 02:18:56PM +0100, Ard Biesheuvel wrote:
>> Add definitions of pud_index() and pmd_index() for configurations with
>> fewer than 4 resp. 3 translation levels. This makes it easier to keep
>> the users (e.g., the fixmap init code) generic.
>>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
>> ---
>>  arch/arm64/include/asm/pgtable.h | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
>> index fe9bf47db5d3..6129f6755081 100644
>> --- a/arch/arm64/include/asm/pgtable.h
>> +++ b/arch/arm64/include/asm/pgtable.h
>> @@ -495,6 +495,7 @@ static inline phys_addr_t pud_page_paddr(pud_t pud)
>>  #else
>>
>>  #define pud_page_paddr(pud)  ({ BUILD_BUG(); 0; })
>> +#define pmd_index(addr)              ({ BUILD_BUG(); 0; })
>>
>>  /* Match pmd_offset folding in <asm/generic/pgtable-nopmd.h> */
>>  #define pmd_set_fixmap(addr)         NULL
>> @@ -542,6 +543,7 @@ static inline phys_addr_t pgd_page_paddr(pgd_t pgd)
>>  #else
>>
>>  #define pgd_page_paddr(pgd)  ({ BUILD_BUG(); 0;})
>> +#define pud_index(addr)              ({ BUILD_BUG(); 0;})
>
> I think we don't need these if we use p??_ofset_kimg for the fixmap
> initialisation.
>
> Regardless, these look good conceptually, so if they're useful
> elsewhere:
>
> Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx>
>

Thanks, but this can indeed be dropped after the proposed changes have
been made to the fixmap init code.

-- 
Ard.