blackfin allmodconfig build fails with the error:
../sound/core/pcm_native.c: In function 'snd_pcm_lib_default_mmap':
../sound/core/pcm_native.c:3386:24: error: implicit declaration of function 'pgprot_writecombine' [-Werror=implicit-function-declaration]
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
^
../sound/core/pcm_native.c:3386:22: error: incompatible types when assigning to type 'pgprot_t {aka struct <anonymous>}' from type 'int'
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
^
When !MMU, asm-generic will not define default pgprot_writecombine, so
blackfin needs to define it by itself.
Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
---
Build log is at
https://travis-ci.org/sudipm-mukherjee/parport/jobs/108209182
The patch idea is from:
65b9ab888cd7 ("arch/c6x/include/asm/pgtable.h: define dummy pgprot_writecombine for !MMU")
arch/blackfin/include/asm/pgtable.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/blackfin/include/asm/pgtable.h b/arch/blackfin/include/asm/pgtable.h
index b88a155..c1ee3d6 100644
--- a/arch/blackfin/include/asm/pgtable.h
+++ b/arch/blackfin/include/asm/pgtable.h
@@ -97,6 +97,8 @@ extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
unsigned long);
#define HAVE_ARCH_FB_UNMAPPED_AREA
+#define pgprot_writecombine pgprot_noncached
+
#include <asm-generic/pgtable.h>
#endif /* _BLACKFIN_PGTABLE_H */
--
1.9.1
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