linux-kernel - Re: [PATCH V5 07/26] mm/mmap: Build protect protection_map[] with ARCH_HAS_VM_GET_PAGE

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Date:   Mon, 27 Jun 2022 05:49:58 +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>,
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        <linux-snps-arc@...ts.infradead.org>,
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        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V5 07/26] mm/mmap: Build protect protection_map[] with
 ARCH_HAS_VM_GET_PAGE_PROT



Le 27/06/2022 à 06:58, Anshuman Khandual a écrit :
> Now that protection_map[] has been moved inside those platforms that enable
> ARCH_HAS_VM_GET_PAGE_PROT. Hence generic protection_map[] array now can be
> protected with CONFIG_ARCH_HAS_VM_GET_PAGE_PROT intead of __P000.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   include/linux/mm.h | 2 +-
>   mm/mmap.c          | 5 +----
>   2 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 47bfe038d46e..65b7f3d9ff87 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -424,7 +424,7 @@ extern unsigned int kobjsize(const void *objp);
>    * mapping from the currently active vm_flags protection bits (the
>    * low four bits) to a page protection mask..
>    */
> -#ifdef __P000
> +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT
>   extern pgprot_t protection_map[16];
>   #endif
>   
> diff --git a/mm/mmap.c b/mm/mmap.c
> index b46d5e931bb3..2cc722e162fa 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -81,7 +81,7 @@ static void unmap_region(struct mm_struct *mm,
>   		struct vm_area_struct *vma, struct vm_area_struct *prev,
>   		unsigned long start, unsigned long end);
>   
> -#ifdef __P000
> +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT
>   pgprot_t protection_map[16] __ro_after_init = {
>   	[VM_NONE]					= __P000,
>   	[VM_READ]					= __P001,
> @@ -100,9 +100,6 @@ pgprot_t protection_map[16] __ro_after_init = {
>   	[VM_SHARED | VM_EXEC | VM_WRITE]		= __S110,
>   	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= __S111
>   };
> -#endif
> -
> -#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT
>   DECLARE_VM_GET_PAGE_PROT
>   #endif	/* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */
>