linux-kernel - [PATCH] mm: hugepage: make hstate_is

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Date:   Mon, 22 May 2017 14:46:57 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Michal Hocko <mhocko@...e.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        zhong jiang <zhongjiang@...wei.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm: hugepage: make hstate_is_gigantic() inline

Ignoring the argument of both alloc_huge_page_node() and hstate_is_gigantic()
causes a harmless warning:

mm/memory-failure.c: In function 'new_page':
mm/memory-failure.c:1493:18: error: unused variable 'hstate' [-Werror=unused-variable]

Turning one into an inline function makes the compiler see that the variable is
not meant to be unused.

Fixes: d81a077951f8 ("mm/madvise: enable (soft|hard) offline of HugeTLB pages at PGD level")
Fixes: 39b80148ffd7 ("mm/follow_page_mask: add support for hugepage directory entry")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/hugetlb.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 76b9ddcd8c3c..c92a1f0c7240 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -532,7 +532,11 @@ struct hstate {};
 #define vma_mmu_pagesize(v) PAGE_SIZE
 #define huge_page_order(h) 0
 #define huge_page_shift(h) PAGE_SHIFT
-#define hstate_is_gigantic(h) 0
+static inline bool hstate_is_gigantic(struct hstate *h)
+{
+	return false;
+}
+
 static inline unsigned int pages_per_huge_page(struct hstate *h)
 {
 	return 1;
-- 
2.9.0