[PATCH V6 21/26] m68k/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

[Anshuman Khandual]

On 7/6/22 15:33, Geert Uytterhoeven wrote:
> Hi Anshuman,
> 
> On Thu, Jun 30, 2022 at 7:19 AM Anshuman Khandual
> <anshuman.khandual at arm.com> wrote:
>> This enables ARCH_HAS_VM_GET_PAGE_PROT on the platform and exports standard
>> vm_get_page_prot() implementation via DECLARE_VM_GET_PAGE_PROT, which looks
>> up a private and static protection_map[] array. Subsequently all __SXXX and
>> __PXXX macros can be dropped which are no longer needed.
>>
>> Cc: Thomas Bogendoerfer <tsbogend at alpha.franken.de>
>> Cc: linux-m68k at lists.linux-m68k.org
>> Cc: linux-kernel at vger.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>
> 
> Thanks for your patch!
> 
>> --- a/arch/m68k/include/asm/mcf_pgtable.h
>> +++ b/arch/m68k/include/asm/mcf_pgtable.h
>> @@ -91,60 +91,6 @@
>>   * for use. In general, the bit positions are xwr, and P-items are
>>   * private, the S-items are shared.
>>   */
> 
> The comment above should be removed, too.

Sure, will do.

> 
>> -#define __P000         PAGE_NONE
>> -#define __P001         __pgprot(CF_PAGE_VALID \
>> -                                | CF_PAGE_ACCESSED \
>> -                                | CF_PAGE_READABLE)
> 
>> --- a/arch/m68k/include/asm/motorola_pgtable.h
>> +++ b/arch/m68k/include/asm/motorola_pgtable.h
>> @@ -83,28 +83,6 @@ extern unsigned long mm_cachebits;
>>  #define PAGE_COPY_C    __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
>>  #define PAGE_READONLY_C        __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
> 
> You might move the *_C definitions above into arch/m68k/mm/motorola.c
> as well, as they are only used in the latter.

Okay, will do.

> 
>>
>> -/*
>> - * The m68k can't do page protection for execute, and considers that the same are read.
>> - * Also, write permissions imply read permissions. This is the closest we can get..
>> - */
>> -#define __P000 PAGE_NONE_C
>> -#define __P001 PAGE_READONLY_C
>> -#define __P010 PAGE_COPY_C
>> -#define __P011 PAGE_COPY_C
>> -#define __P100 PAGE_READONLY_C
>> -#define __P101 PAGE_READONLY_C
>> -#define __P110 PAGE_COPY_C
>> -#define __P111 PAGE_COPY_C
>> -
>> -#define __S000 PAGE_NONE_C
>> -#define __S001 PAGE_READONLY_C
>> -#define __S010 PAGE_SHARED_C
>> -#define __S011 PAGE_SHARED_C
>> -#define __S100 PAGE_READONLY_C
>> -#define __S101 PAGE_READONLY_C
>> -#define __S110 PAGE_SHARED_C
>> -#define __S111 PAGE_SHARED_C
>> -
>>  #define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd))
>>
>>  /*
>> diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
>> index 5e4e753f0d24..9d919491765b 100644
>> --- a/arch/m68k/include/asm/sun3_pgtable.h
>> +++ b/arch/m68k/include/asm/sun3_pgtable.h
>> @@ -71,23 +71,6 @@
>>   * protection settings, valid (implying read and execute) and writeable. These
>>   * are as close as we can get...
>>   */
> 
> The comment above should be removed, too.

Sure, will do.

> 
>> -#define __P000 PAGE_NONE
>> -#define __P001 PAGE_READONLY
> 
> With the above fixed:
> Reviewed-by: Geert Uytterhoeven <geert at linux-m68k.org>
> Acked-by: Geert Uytterhoeven <geert at linux-m68k.org>> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
>