e928f35061
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
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