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

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Message-Id: <20200622234740.72825-3-natechancellor@gmail.com>
Date:   Mon, 22 Jun 2020 16:47:40 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Christoph Hellwig <hch@....de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH 2/2] asm-generic: Make cacheflush.h self-contained

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@...il.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