linux-kernel - [PATCH] Fix undefined ioremap_huge_init when CONFIG

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Date:	Thu,  5 Mar 2015 08:44:06 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	akpm@...ux-foundation.org
Cc:	linux-mm@...ck.org, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, kbuild-all@...org,
	sfr@...b.auug.org.au, fengguang.wu@...el.com, hannes@...xchg.org,
	Toshi Kani <toshi.kani@...com>
Subject: [PATCH] Fix undefined ioremap_huge_init when CONFIG_MMU is not set

Fix a build error, undefined reference to ioremap_huge_init, when
CONFIG_MMU is not defined on linux-next and -mm tree.

lib/ioremap.o is not linked to the kernel when CONFIG_MMU is not
defined.

Signed-off-by: Toshi Kani <toshi.kani@...com>
---
 include/linux/io.h |    5 +++--
 lib/ioremap.c      |    1 -
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/io.h b/include/linux/io.h
index 1ce8b4e..4cc299c 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -38,11 +38,12 @@ static inline int ioremap_page_range(unsigned long addr, unsigned long end,
 }
 #endif
 
-void __init ioremap_huge_init(void);
-
 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+void __init ioremap_huge_init(void);
 int arch_ioremap_pud_supported(void);
 int arch_ioremap_pmd_supported(void);
+#else
+static inline void ioremap_huge_init(void) { }
 #endif
 
 /*
diff --git a/lib/ioremap.c b/lib/ioremap.c
index 3055ada..be24906 100644
--- a/lib/ioremap.c
+++ b/lib/ioremap.c
@@ -46,7 +46,6 @@ static inline int ioremap_pmd_enabled(void)
 }
 
 #else	/* !CONFIG_HAVE_ARCH_HUGE_VMAP */
-void __init ioremap_huge_init(void) { }
 static inline int ioremap_pud_enabled(void) { return 0; }
 static inline int ioremap_pmd_enabled(void) { return 0; }
 #endif	/* CONFIG_HAVE_ARCH_HUGE_VMAP */
--
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