linux-kernel - Re: [PATCH 10/10] arch: fix has_transparent

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Date:	Wed, 6 Apr 2016 08:58:06 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Yang Shi <yang.shi@...aro.org>, Ning Qu <quning@...il.com>,
	Arnd Bergman <arnd@...db.de>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Vineet Gupta <vgupta@...opsys.com>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Michael Ellerman <mpe@...erman.id.au>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>,
	David Miller <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 10/10] arch: fix has_transparent_hugepage()


* Hugh Dickins <hughd@...gle.com> wrote:

> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -181,6 +181,7 @@ static inline int pmd_trans_huge(pmd_t p
>  	return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
>  }
>  
> +#define has_transparent_hugepage has_transparent_hugepage
>  static inline int has_transparent_hugepage(void)
>  {
>  	return cpu_has_pse;

Small nit, just writing:

  #define has_transparent_hugepage

ought to be enough, right?

In any case:

  Acked-by: Ingo Molnar <mingo@...nel.org>

Another nit, this:

> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -806,4 +806,12 @@ static inline int pmd_clear_huge(pmd_t *
>  #define io_remap_pfn_range remap_pfn_range
>  #endif
>  
> +#ifndef has_transparent_hugepage
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +#define has_transparent_hugepage() 1
> +#else
> +#define has_transparent_hugepage() 0
> +#endif
> +#endif

Looks a bit more structured as:

  #ifndef has_transparent_hugepage
  # ifdef CONFIG_TRANSPARENT_HUGEPAGE
  #  define has_transparent_hugepage() 1
  # else
  #  define has_transparent_hugepage() 0
  # endif
  #endif

BYMMV.

Thanks,

	Ingo