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

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Date:	Wed, 6 Apr 2016 23:58:19 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Chris Metcalf <cmetcalf@...lanox.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	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>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 10/10] arch: fix has_transparent_hugepage()


* Chris Metcalf <cmetcalf@...lanox.com> wrote:

> On 4/6/2016 2:58 AM, Ingo Molnar wrote:
> >* 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?
> 
> No, since then in hugepage_init() the has_transparent_hugepage() call site
> would be left with just a stray pair of parentheses instead of a call.

Yes, indeed ...

Thanks,

	Ingo