[PATCH] mm/debug-pagealloc: add missing debug_pagealloc_enabled

[PATCH] mm/debug-pagealloc: add missing debug_pagealloc_enabled

[Arnd Bergmann]

The change to move the pagealloc logic broke the slab allocator
check when it's disabled at compile time:

mm/slab.c: In function 'is_debug_pagealloc_cache':
mm/slab.c:1608:29: error: implicit declaration of function 'debug_pagealloc_enabled' [-Werror=implicit-function-declaration]

This adds an inline helper to get it to work again.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 0a244aea1a61 ("mm/slab: clean up DEBUG_PAGEALLOC processing code")
---
 include/linux/mm.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5d86eb2e8584..90d600ce56ad 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2242,6 +2242,7 @@ kernel_map_pages(struct page *page, int numpages, int enable)
 extern bool kernel_page_present(struct page *page);
 #endif /* CONFIG_HIBERNATION */
 #else
+static inline bool debug_pagealloc_enabled(void) { return 0; }
 static inline void
 kernel_map_pages(struct page *page, int numpages, int enable) {}
 #ifdef CONFIG_HIBERNATION
-- 
2.7.0

[PATCH] mm/debug-pagealloc: add missing debug_pagealloc_enabled

[Laura Abbott]

On 02/03/2016 02:15 PM, Arnd Bergmann wrote:
> The change to move the pagealloc logic broke the slab allocator
> check when it's disabled at compile time:
>
> mm/slab.c: In function 'is_debug_pagealloc_cache':
> mm/slab.c:1608:29: error: implicit declaration of function 'debug_pagealloc_enabled' [-Werror=implicit-function-declaration]
>
> This adds an inline helper to get it to work again.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: 0a244aea1a61 ("mm/slab: clean up DEBUG_PAGEALLOC processing code")
> ---
>   include/linux/mm.h | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 5d86eb2e8584..90d600ce56ad 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2242,6 +2242,7 @@ kernel_map_pages(struct page *page, int numpages, int enable)
>   extern bool kernel_page_present(struct page *page);
>   #endif /* CONFIG_HIBERNATION */
>   #else
> +static inline bool debug_pagealloc_enabled(void) { return 0; }
>   static inline void
>   kernel_map_pages(struct page *page, int numpages, int enable) {}
>   #ifdef CONFIG_HIBERNATION
>

I believe this should be fixed with http://article.gmane.org/gmane.linux.kernel.mm/145655

[PATCH] mm/debug-pagealloc: add missing debug_pagealloc_enabled

[Arnd Bergmann]

On Wednesday 03 February 2016 14:30:09 Laura Abbott wrote:
> On 02/03/2016 02:15 PM, Arnd Bergmann wrote:
> > The change to move the pagealloc logic broke the slab allocator
> > check when it's disabled at compile time:
> >
> > mm/slab.c: In function 'is_debug_pagealloc_cache':
> > mm/slab.c:1608:29: error: implicit declaration of function 'debug_pagealloc_enabled' [-Werror=implicit-function-declaration]
> >
> > This adds an inline helper to get it to work again.
> >
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > Fixes: 0a244aea1a61 ("mm/slab: clean up DEBUG_PAGEALLOC processing code")
> > ---
> >   include/linux/mm.h | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index 5d86eb2e8584..90d600ce56ad 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -2242,6 +2242,7 @@ kernel_map_pages(struct page *page, int numpages, int enable)
> >   extern bool kernel_page_present(struct page *page);
> >   #endif /* CONFIG_HIBERNATION */
> >   #else
> > +static inline bool debug_pagealloc_enabled(void) { return 0; }
> >   static inline void
> >   kernel_map_pages(struct page *page, int numpages, int enable) {}
> >   #ifdef CONFIG_HIBERNATION
> >
> 
> I believe this should be fixed with http://article.gmane.org/gmane.linux.kernel.mm/145655

Yes, Christian's version looks nicer too (correct return type).

Thanks,

	Arnd