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From: Arnd Bergmann <>
To: Andrew Morton <>
Cc: Arnd Bergmann <>,
	Naoya Horiguchi <>,
	"Aneesh Kumar K.V" <>,
	Punit Agrawal <>,
	Anshuman Khandual <>,
Subject: [PATCH] mm: hugetlb: replace some macros with inline functions
Date: Fri,  9 Jun 2017 12:25:05 +0200
Message-ID: <> (raw)

All users of dissolve_free_huge_page() that ignore the result cause a warning
when CONFIG_HUGETLB_PAGE is disabled:

mm/memory-failure.c: In function 'me_huge_page':
include/linux/hugetlb.h:556:36: error: statement with no effect [-Werror=unused-value]
 #define dissolve_free_huge_page(p) 0

We can avoid this by using an inline function instead of the macro, and I
decided to do the same change for the related helpers as well.

Fixes: mmotm ("mm: hugetlb: soft-offline: dissolve source hugepage after successful migration")
Signed-off-by: Arnd Bergmann <>
 include/linux/hugetlb.h | 31 ++++++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 5 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index dbb118c566cd..57f700ac127e 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -546,16 +546,37 @@ static inline unsigned int pages_per_huge_page(struct hstate *h)
 	return 1;
-#define hstate_index_to_shift(index) 0
-#define hstate_index(h) 0
+static inline unsigned hstate_index_to_shift(unsigned index)
+	return 0;
+static inline int hstate_index(struct hstate *h)
+	return 0;
 static inline pgoff_t basepage_index(struct page *page)
 	return page->index;
-#define dissolve_free_huge_page(p)	0
-#define dissolve_free_huge_pages(s, e)	0
-#define hugepage_migration_supported(h)	false
+static inline int dissolve_free_huge_page(struct page *page)
+	return 0;
+static inline int dissolve_free_huge_pages(unsigned long start_pfn,
+					   unsigned long end_pfn)
+	return 0;
+static inline bool hugepage_migration_supported(struct hstate *h)
+	return false;
 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 					   struct mm_struct *mm, pte_t *pte)

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-09 10:25 Arnd Bergmann [this message]
2017-06-11 23:50 ` Naoya Horiguchi

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