linux-kernel - [PATCH] mm: Mark create_huge_pmd() inline to prevent build failure

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Date:   Wed, 12 Jul 2017 08:57:40 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Dan Williams <dan.j.williams@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] mm: Mark create_huge_pmd() inline to prevent build failure

With gcc 4.1.2:

    mm/memory.o: In function `create_huge_pmd':
    memory.c:(.text+0x93e): undefined reference to `do_huge_pmd_anonymous_page'

Converting transparent_hugepage_enabled() from a macro to a static
inline function reduced the ability of the compiler to remove unused
code.

Fix this by marking create_huge_pmd() inline.

Fixes: 16981d763501c0e0 ("mm: improve readability of transparent_hugepage_enabled()")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
Interestingly, create_huge_pmd() is emitted in the assembler output, but
never called.
---
 mm/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index cbb57194687e393a..0e517be91a89e162 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3591,7 +3591,7 @@ static int do_numa_page(struct vm_fault *vmf)
 	return 0;
 }
 
-static int create_huge_pmd(struct vm_fault *vmf)
+static inline int create_huge_pmd(struct vm_fault *vmf)
 {
 	if (vma_is_anonymous(vmf->vma))
 		return do_huge_pmd_anonymous_page(vmf);
-- 
2.7.4