linux-kernel - Re: [PATCH V6 21/26] m68k/mm: Enable ARCH_HAS_VM_GET_PAGE

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Message-ID: <ea0f8db8-831b-dcb4-b8c7-ab651f1e1713@arm.com>
Date:   Wed, 6 Jul 2022 16:45:27 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-csky@...r.kernel.org,
        sparclinux <sparclinux@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        "open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Christoph Hellwig <hch@...radead.org>,
        arcml <linux-snps-arc@...ts.infradead.org>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>,
        linux-um <linux-um@...ts.infradead.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Openrisc <openrisc@...ts.librecores.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Parisc List <linux-parisc@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        alpha <linux-alpha@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH V6 21/26] m68k/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT



On 7/6/22 15:33, Geert Uytterhoeven wrote:
> Hi Anshuman,
> 
> On Thu, Jun 30, 2022 at 7:19 AM Anshuman Khandual
> <anshuman.khandual@....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@...ha.franken.de>
>> Cc: linux-m68k@...ts.linux-m68k.org
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....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@...ux-m68k.org>
> Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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
>