RISC-V: Avoid corrupting the upper 32-bit of phys_addr_t in ioremap

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For 32bit, the upper 32-bit of phys_addr_t will be flushed to zero
after AND with PAGE_MASK because the data type of PAGE_MASK is
unsigned long. To fix this problem, the page alignment is done by
subtracting the page offset instead of AND with PAGE_MASK.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

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Vincent Chen 2018-10-02 16:52:31 +08:00 • committed by Palmer Dabbelt

parent 757331db92

commit 827a438156

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arch/riscv/mm/ioremap.c

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