linux-kernel - Re: [PATCH 36 of 36] x86: make the X

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Message-ID: <Pine.LNX.4.64.0902052024470.13998@blonde.anvils>
Date:	Thu, 5 Feb 2009 20:25:48 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH 36 of 36] x86: make the X_bad functions consistent

On Thu, 5 Feb 2009, Jeremy Fitzhardinge wrote:

> Impact: cleanup
> 
> Use the same logic to implement all 3 _bad() functions.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

A backward step in my opinion.

Hugh

> ---
>  arch/x86/include/asm/pgtable.h |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -554,7 +554,7 @@
>  
>  static inline int pmd_bad(pmd_t pmd)
>  {
> -	return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
> +	return (pmd_flags(pmd) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
>  }
>  
>  static inline unsigned long pages_to_mb(unsigned long npg)
> @@ -638,7 +638,7 @@
>  
>  static inline int pgd_bad(pgd_t pgd)
>  {
> -	return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
> +	return (pgd_flags(pgd) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
>  }
>  
>  static inline int pgd_none(pgd_t pgd)
--
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