[PATCH 2/2] asm-generic: Make cacheflush.h self-contained

[Nathan Chancellor <natechancellor@gmail.com>]

Currently, cacheflush.h has to be included after mm.h to avoid several
-Wvisibility warnings:

$ clang -Wvisibility -fsyntax-only include/asm-generic/cacheflush.h
include/asm-generic/cacheflush.h:16:42: warning: declaration of 'struct
mm_struct' will not be visible outside of this function [-Wvisibility]
static inline void flush_cache_mm(struct mm_struct *mm)
                                         ^
...
include/asm-generic/cacheflush.h:28:45: warning: declaration of 'struct
vm_area_struct' will not be visible outside of this function
[-Wvisibility]
static inline void flush_cache_range(struct vm_area_struct *vma,
                                            ^
...

Add a few forward declarations should that there are no warnings and the
ordering of the includes does not matter.

Fixes: e0cf615d725c ("asm-generic: don't include <linux/mm.h> in cacheflush.h")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 include/asm-generic/cacheflush.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h
index 907fa5d16494..093b743da596 100644
--- a/include/asm-generic/cacheflush.h
+++ b/include/asm-generic/cacheflush.h
@@ -2,6 +2,11 @@
 #ifndef _ASM_GENERIC_CACHEFLUSH_H
 #define _ASM_GENERIC_CACHEFLUSH_H
 
+struct address_space;
+struct mm_struct;
+struct page;
+struct vm_area_struct;
+
 /*
  * The cache doesn't need to be flushed when TLB entries change when
  * the cache is mapped to physical memory, not virtual memory
-- 
2.27.0