[PATCH v2] sparc: cacheflush_32.h needs struct page

[Randy Dunlap]

Add a struct page forward declaration to cacheflush_32.h.
Fixes this build warning:

  CC      drivers/crypto/xilinx/zynqmp-sha.o
In file included from ../arch/sparc/include/asm/cacheflush.h:11,
                 from ../include/linux/cacheflush.h:5,
                 from ../drivers/crypto/xilinx/zynqmp-sha.c:6:
../arch/sparc/include/asm/cacheflush_32.h:38:37: warning: 'struct page' declared inside parameter list will not be visible outside of this definition or declaration
   38 | void sparc_flush_page_to_ram(struct page *page);

Exposed by commit 0e03b8fd2936
("crypto: xilinx - Turn SHA into a tristate and allow COMPILE_TEST")
but not Fixes: that commit.

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: sparclinux@xxxxxxxxxxxxxxx
---
v2: use forward declaration instead of adding <linux/mm.h> (Sam)

 arch/sparc/include/asm/cacheflush_32.h |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/sparc/include/asm/cacheflush_32.h
+++ b/arch/sparc/include/asm/cacheflush_32.h
@@ -35,6 +35,7 @@
 #define flush_page_for_dma(addr) \
 	sparc32_cachetlb_ops->page_for_dma(addr)
 
+struct page;
 void sparc_flush_page_to_ram(struct page *page);
 
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1