linux-kernel - Re: [PATCH] x86 : omit duplicate processing at pte

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Date:	Sun, 16 Aug 2009 11:00:30 +0900 (JST)
From:	ohyama_sec@...el-networks.com
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86 : omit duplicate processing at pte_pgprot()

I'm sorry, I resend the same context message accidentally.
So, please ignore this message.

thank you.

ohyama_sec@...el-networks.com wrote:
> I suggest following PATCH that omit duplicate processing of mask.
>
> pte_pgprot() macro [arch/x86/include/asm/pgtable.h] call pte_flags() [arch/x86/include/asm/pgtable_types.h] that return value is masked by PTE_FLAGS_MASK in pte_flags() function, and this macro also masks the returned value by PTE_FLAGS_MASK.
>
> I guess that we don't have to do the mask processing at pte_pgprot() macro because it has already been masked at pte_flags().
> So, how about the following PATCH ?
>
>     <Hiroyasu OHYAMA>
>
> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> index 3cc06e3..a0b454c 100644
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -265,7 +265,7 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
>         return __pgprot(preservebits | addbits);
>          }
>
>          -#define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
>          +#define pte_pgprot(x) __pgprot(pte_flags(x))
>
>           #define canon_pgprot(p) __pgprot(massage_pgprot(p))
> -- 
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