linux-kernel - Re: linux-next: build failure after merge of the akpm-current tree

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Date:	Wed, 3 Feb 2016 13:36:57 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Joonsoo Kim <js1304@...il.com>
Subject: Re: linux-next: build failure after merge of the akpm-current tree

On Wed, 3 Feb 2016 16:36:13 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:

> Hi Andrew,
> 
> After merging the akpm-current tree, today's linux-next build (arm
> ep93xx_defconfig) failed like this:
> 
> mm/slab.c: In function 'is_debug_pagealloc_cache':
> mm/slab.c:1608:2: error: implicit declaration of function 'debug_pagealloc_enabled' [-Werror=implicit-function-declaration]
> 
> Caused by commit
> 
>   0a244aea1a61 ("mm/slab: clean up DEBUG_PAGEALLOC processing code")
> 
> CONFIG_DEBUG_PAGEALLOC is not enabled in this build.
> 
> Discovered after the linux-next release.

This works for me.

--- a/include/linux/mm.h~mm-slab-clean-up-debug_pagealloc-processing-code-fix
+++ a/include/linux/mm.h
@@ -2194,14 +2194,18 @@ kernel_map_pages(struct page *page, int
 }
 #ifdef CONFIG_HIBERNATION
 extern bool kernel_page_present(struct page *page);
-#endif /* CONFIG_HIBERNATION */
-#else
+#endif	/* CONFIG_HIBERNATION */
+#else	/* CONFIG_DEBUG_PAGEALLOC */
 static inline void
 kernel_map_pages(struct page *page, int numpages, int enable) {}
 #ifdef CONFIG_HIBERNATION
 static inline bool kernel_page_present(struct page *page) { return true; }
-#endif /* CONFIG_HIBERNATION */
-#endif
+#endif	/* CONFIG_HIBERNATION */
+static inline bool debug_pagealloc_enabled(void)
+{
+	return false;
+}
+#endif	/* CONFIG_DEBUG_PAGEALLOC */
 
 #ifdef __HAVE_ARCH_GATE_AREA
 extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
_