[PATCH] Fix #include in drm_mm.h to unbreak ia64 build

[David Herrmann]

Hi

On Mon, Jul 29, 2013 at 8:51 PM, Luck, Tony <tony.luck at intel.com> wrote:
> Linux-next build on ia64 is falling over with errors like this:
>
> In file included from include/drm/drm_vma_manager.h:26,
>                  from include/drm/ttm/ttm_bo_api.h:35,
>                  from include/drm/ttm/ttm_bo_driver.h:33,
>                  from drivers/gpu/drm/ttm/ttm_agp_backend.c:35:
> include/drm/drm_mm.h:67: error: expected specifier-qualifier-list before 'spinlock_t'
>
> I guess other architectures are pulling in spinlock.h
> through some twisty #include path so are not seeing this
> error.  But drm_mm.h makes use of spinlock_t - so it
> should do the right thing and #include <linux/spinlock.h>
>
> Signed-off-by: Tony Luck <tony.luck at intel.com>

Yepp, that broke due to the drm_vma_manager.h include in TTM. There is
already a fix pending on the ML:
  http://www.spinics.net/lists/dri-devel/msg42101.html

Thanks
David

> ---
>
> First saw this break in tag "next-20130726"
>
> diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
> index b87d05e..7d5fbae 100644
> --- a/include/drm/drm_mm.h
> +++ b/include/drm/drm_mm.h
> @@ -37,6 +37,7 @@
>   * Generic range manager structs
>   */
>  #include <linux/list.h>
> +#include <linux/spinlock.h>
>  #ifdef CONFIG_DEBUG_FS
>  #include <linux/seq_file.h>
>  #endif
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