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RISC-V: Avoid corrupting the upper 32-bit of phys_addr_t in ioremap
authorVincent Chen <vincentc@andestech.com>
Tue, 2 Oct 2018 08:52:31 +0000 (16:52 +0800)
committerPalmer Dabbelt <palmer@sifive.com>
Tue, 23 Oct 2018 00:02:56 +0000 (17:02 -0700)
commit827a438156e4c423b6875a092e272933952a2910
treeb06c4c99ec6e728b6447a5a6c6d61bac60c84e78tree | snapshot
parent757331db921428295948fed5e7377a436e66d34ecommit | diff
RISC-V: Avoid corrupting the upper 32-bit of phys_addr_t in ioremap

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>
arch/riscv/mm/ioremap.c diff | blob | history
Domain: System / Kernel;