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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>
e928f35061