[PATCH] cgroup: add seq_file forward declaration for struct cftype

[Arnd Bergmann]

Recent header file changes for cgroup caused lots of warnings
about a missing struct seq_file form declaration for every
inclusion of include/linux/cgroup-defs.h.

As some files are built with -Werror, this leads to build
failure like:

                 from /git/arm-soc/drivers/gpu/drm/tilcdc/tilcdc_crtc.c:18:
/git/arm-soc/include/linux/cgroup-defs.h:354:25: error: 'struct seq_file' declared inside parameter list [-Werror]
cc1: all warnings being treated as errors
make[6]: *** [drivers/gpu/drm/tilcdc/tilcdc_crtc.o] Error 1

This patch adds the declaration, which resolves both the
warnings and the drm failure.

tj: Moved it where other type declarations are.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Fixes: b4a04ab7a37b ("cgroup: separate out include/linux/cgroup-defs.h")
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
---
 include/linux/cgroup-defs.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 7d83d7f..26d1cea 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -26,6 +26,7 @@ struct cgroup_taskset;
 struct kernfs_node;
 struct kernfs_ops;
 struct kernfs_open_file;
+struct seq_file;
 
 #define MAX_CGROUP_TYPE_NAMELEN 32
 #define MAX_CGROUP_ROOT_NAMELEN 64
-- 
2.4.0

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