linux-kernel - Re: [PATCH V4 08/26] microblaze/mm: Enable ARCH_HAS_VM_GET_PAGE

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Date:   Fri, 24 Jun 2022 05:24:50 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
CC:     "hch@...radead.org" <hch@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "openrisc@...ts.librecores.org" <openrisc@...ts.librecores.org>,
        "linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
        "linux-csky@...r.kernel.org" <linux-csky@...r.kernel.org>,
        "linux-hexagon@...r.kernel.org" <linux-hexagon@...r.kernel.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-m68k@...ts.linux-m68k.org" <linux-m68k@...ts.linux-m68k.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-um@...ts.infradead.org" <linux-um@...ts.infradead.org>,
        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michal Simek <monstr@...str.eu>
Subject: Re: [PATCH V4 08/26] microblaze/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT



Le 24/06/2022 à 06:43, Anshuman Khandual a écrit :
> 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.

In this patch and all following ones, can't protection_map[] be const 
instead of __ro_after_init ?

> 
> Cc: Michal Simek <monstr@...str.eu>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>   arch/microblaze/Kconfig               |  1 +
>   arch/microblaze/include/asm/pgtable.h | 17 -----------------
>   arch/microblaze/mm/init.c             | 20 ++++++++++++++++++++
>   3 files changed, 21 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
> index 8cf429ad1c84..15f91ba8a0c4 100644
> --- a/arch/microblaze/Kconfig
> +++ b/arch/microblaze/Kconfig
> @@ -7,6 +7,7 @@ config MICROBLAZE
>   	select ARCH_HAS_GCOV_PROFILE_ALL
>   	select ARCH_HAS_SYNC_DMA_FOR_CPU
>   	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
> +	select ARCH_HAS_VM_GET_PAGE_PROT
>   	select ARCH_MIGHT_HAVE_PC_PARPORT
>   	select ARCH_WANT_IPC_PARSE_VERSION
>   	select BUILDTIME_TABLE_SORT
> diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
> index 0c72646370e1..ba348e997dbb 100644
> --- a/arch/microblaze/include/asm/pgtable.h
> +++ b/arch/microblaze/include/asm/pgtable.h
> @@ -204,23 +204,6 @@ extern pte_t *va_to_pte(unsigned long address);
>    * We consider execute permission the same as read.
>    * Also, write permissions imply read permissions.
>    */
> -#define __P000	PAGE_NONE
> -#define __P001	PAGE_READONLY_X
> -#define __P010	PAGE_COPY
> -#define __P011	PAGE_COPY_X
> -#define __P100	PAGE_READONLY
> -#define __P101	PAGE_READONLY_X
> -#define __P110	PAGE_COPY
> -#define __P111	PAGE_COPY_X
> -
> -#define __S000	PAGE_NONE
> -#define __S001	PAGE_READONLY_X
> -#define __S010	PAGE_SHARED
> -#define __S011	PAGE_SHARED_X
> -#define __S100	PAGE_READONLY
> -#define __S101	PAGE_READONLY_X
> -#define __S110	PAGE_SHARED
> -#define __S111	PAGE_SHARED_X
>   
>   #ifndef __ASSEMBLY__
>   /*
> diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
> index f4e503461d24..315fd5024f00 100644
> --- a/arch/microblaze/mm/init.c
> +++ b/arch/microblaze/mm/init.c
> @@ -285,3 +285,23 @@ void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
>   
>   	return p;
>   }
> +
> +static pgprot_t protection_map[16] __ro_after_init = {
> +	[VM_NONE]					= PAGE_NONE,
> +	[VM_READ]					= PAGE_READONLY_X,
> +	[VM_WRITE]					= PAGE_COPY,
> +	[VM_WRITE | VM_READ]				= PAGE_COPY_X,
> +	[VM_EXEC]					= PAGE_READONLY,
> +	[VM_EXEC | VM_READ]				= PAGE_READONLY_X,
> +	[VM_EXEC | VM_WRITE]				= PAGE_COPY,
> +	[VM_EXEC | VM_WRITE | VM_READ]			= PAGE_COPY_X,
> +	[VM_SHARED]					= PAGE_NONE,
> +	[VM_SHARED | VM_READ]				= PAGE_READONLY_X,
> +	[VM_SHARED | VM_WRITE]				= PAGE_SHARED,
> +	[VM_SHARED | VM_WRITE | VM_READ]		= PAGE_SHARED_X,
> +	[VM_SHARED | VM_EXEC]				= PAGE_READONLY,
> +	[VM_SHARED | VM_EXEC | VM_READ]			= PAGE_READONLY_X,
> +	[VM_SHARED | VM_EXEC | VM_WRITE]		= PAGE_SHARED,
> +	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= PAGE_SHARED_X
> +};
> +DECLARE_VM_GET_PAGE_PROT