linux-kernel - Re: [PATCH 1/2] mm: Update generic gup implementation to handle hugepage directory

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Message-ID: <87ppdrki09.fsf@linux.vnet.ibm.com>
Date:	Thu, 16 Oct 2014 23:35:10 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Steve Capper <steve.capper@...aro.org>
Cc:	akpm@...ux-foundation.org, Andrea Arcangeli <aarcange@...hat.com>,
	benh@...nel.crashing.org, mpe@...erman.id.au, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-arch@...r.kernel.org, will.deacon@....com,
	catalin.marinas@....com, linux@....linux.org.uk
Subject: Re: [PATCH 1/2] mm: Update generic gup implementation to handle hugepage directory

Steve Capper <steve.capper@...aro.org> writes:

> Can we not just add a:
> #define pgd_huge(pgd)		(0)
> above the "#endif /* CONFIG_HUGETLB_PAGE */" line in the second patch?
> (or, more precisely, prevent the second patch from removing this line).
>
> That way we get a clearer code overall?

it is strange to have both pmd_huge and pud_huge in hugetlb.h and
pgd_huge in page.h. But if that is what we want then we may need.


diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index aa430ec14895..aeca81947dc6 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -383,6 +383,7 @@ static inline int hugepd_ok(hugepd_t hpd)
 int pgd_huge(pgd_t pgd);
 #else /* CONFIG_HUGETLB_PAGE */
 #define is_hugepd(pdep)			0
+#define pgd_huge(pgd)			0
 #endif /* CONFIG_HUGETLB_PAGE */
 #define __hugepd(x) ((hugepd_t) { (x) })
 

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