[PATCH -next] video: fbdev: controlfb: Fix COMPILE_TEST build

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If PPC_BOOK3S, PPC_PMAC and PPC32 is n, COMPILE_TEST build fails:

drivers/video/fbdev/controlfb.c:70:0: error: "pgprot_cached_wthru" redefined [-Werror]
 #define pgprot_cached_wthru(prot) (prot)

In file included from ./arch/powerpc/include/asm/pgtable.h:20:0,
                 from ./include/linux/pgtable.h:6,
                 from ./include/linux/mm.h:33,
                 from drivers/video/fbdev/controlfb.c:37:
./arch/powerpc/include/asm/nohash/pgtable.h:243:0: note: this is the location of the previous definition
 #define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \

Fixes: a07a63b0e24d ("video: fbdev: controlfb: add COMPILE_TEST support")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/video/fbdev/controlfb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/fbdev/controlfb.c b/drivers/video/fbdev/controlfb.c
index 509311471d51..bd59e7b11ed5 100644
--- a/drivers/video/fbdev/controlfb.c
+++ b/drivers/video/fbdev/controlfb.c
@@ -67,7 +67,9 @@
 #define out_8(addr, val)	(void)(val)
 #define in_le32(addr)		0
 #define out_le32(addr, val)	(void)(val)
+#ifndef pgprot_cached_wthru
 #define pgprot_cached_wthru(prot) (prot)
+#endif
 #else
 static void invalid_vram_cache(void __force *addr)
 {
-- 
2.17.1




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