csky: Fixup dma_alloc_coherent with PAGE_SO attribute

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This bug is from commit: 2b070ccdf8 (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>

...

This commit is contained in:

Guo Ren 2019-07-30 14:43:22 +08:00

parent 81b23ba645

commit 7f80fe207d

2 changed files with 12 additions and 4 deletions

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10

arch/csky/include/asm/pgtable.h

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6

arch/csky/mm/ioremap.c

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