linux-kernel - [PATCH] mm, THP: vmf_insert_pfn_pud depends on CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE

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Message-Id: <1515660811-12293-1-git-send-email-aghiti@upmem.com>
Date:   Thu, 11 Jan 2018 09:53:31 +0100
From:   Alexandre Ghiti <aghiti@...em.com>
To:     linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
        mhocko@...e.com, dan.j.williams@...el.com, zi.yan@...rutgers.edu,
        gregkh@...uxfoundation.org, n-horiguchi@...jp.nec.com,
        willy@...ux.intel.com, mark.rutland@....com,
        linux-kernel@...r.kernel.org, Alexandre Ghiti <aghiti@...em.com>
Subject: [PATCH] mm, THP: vmf_insert_pfn_pud depends on CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD

The only definition of vmf_insert_pfn_pud depends on
CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD being defined. Then its declaration in
include/linux/huge_mm.h should have the same restriction so that we do
not expose this function if CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD is
not defined.

Signed-off-by: Alexandre Ghiti <aghiti@...em.com>
---
 include/linux/huge_mm.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index a8a1262..11794f6a 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -48,8 +48,10 @@ extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 			int prot_numa);
 int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
 			pmd_t *pmd, pfn_t pfn, bool write);
+#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 int vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
 			pud_t *pud, pfn_t pfn, bool write);
+#endif
 enum transparent_hugepage_flag {
 	TRANSPARENT_HUGEPAGE_FLAG,
 	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
-- 
2.1.4