From: Masami Hiramatsu <mhira...@kernel.org>

commit 5be9b730b09c45c358bbfe7f51d254e306cccc07 upstream.

Add a prototype of task_struct to fix below warning on arm64.

  In file included from arch/arm64/kernel/probes/kprobes.c:19:0:
  include/linux/kasan.h:81:132: error: 'struct task_struct' declared inside 
parameter list will not be visible outside of this definition or declaration 
[-Werror]
   static inline void kasan_unpoison_task_stack(struct task_struct *task) {}

As same as other types (kmem_cache, page, and vm_struct) this adds a
prototype of task_struct data structure on top of kasan.h.

[arnd] A related warning was fixed before, but now appears in a
different line in the same file in v4.11-rc2.  The patch from Masami
Hiramatsu still seems appropriate, so let's take his version.

Fixes: 71af2ed5eeea ("kasan, sched/headers: Remove <linux/sched.h> from 
<linux/kasan.h>")
Link: https://patchwork.kernel.org/patch/9569839/
Link: http://lkml.kernel.org/r/20170313141517.3397802-1-a...@arndb.de
Signed-off-by: Arnd Bergmann <a...@arndb.de>
Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
Acked-by: Alexander Potapenko <gli...@google.com>
Acked-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
Cc: Dmitry Vyukov <dvyu...@google.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Andrey Konovalov <andreyk...@google.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 include/linux/kasan.h |    1 +
 1 file changed, 1 insertion(+)

--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -7,6 +7,7 @@
 struct kmem_cache;
 struct page;
 struct vm_struct;
+struct task_struct;
 
 #ifdef CONFIG_KASAN
 


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