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Guo Ren authored
This bug is from commit: 2b070ccd (fixup abiv2 mmap(... O_SYNC) failed). In that patch we remove the _PAGE_SO for memory noncache mapping and this will cause problem when drivers use dma descriptors to control the transcations without dma_w/rmb(). After referencing other archs' implementation, pgprot_writecombine is introduced for mmap(... O_SYNC). Signed-off-by:
Guo Ren <ren_guo@c-sky.com>
7f80fe20