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blackfin: define dummy pgprot_writecombine for !MMU

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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.

The patch idea is from commit 65b9ab888c ("arch/c6x/include/asm/pgtable.h:
define dummy pgprot_writecombine for !MMU")

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Cc: Steven Miao <realmz6@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sudip Mukherjee 2016-03-15 14:52:55 -07:00 committed by Linus Torvalds
parent 3701dc8151
commit e928f35061
1 changed files with 2 additions and 0 deletions
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2
arch/blackfin/include/asm/pgtable.h
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@ -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 */