linux-kernel - Re: [PATCH] mm/debug-pagealloc: add missing debug_pagealloc

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Date:	Wed, 3 Feb 2016 14:30:09 -0800
From:	Laura Abbott <labbott@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Laura Abbott <labbott@...oraproject.org>, linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Michal Hocko <mhocko@...e.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/debug-pagealloc: add missing debug_pagealloc_enabled

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@...db.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