diff options
| author | Vincent Chen <vincentc@andestech.com> | 2018-10-02 16:52:31 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@sifive.com> | 2018-10-22 17:02:56 -0700 |
| commit | 827a438156e4c423b6875a092e272933952a2910 (patch) | |
| tree | b06c4c99ec6e728b6447a5a6c6d61bac60c84e78 /arch/riscv/mm | |
| parent | 757331db921428295948fed5e7377a436e66d34e (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>
Diffstat (limited to 'arch/riscv/mm')
| -rw-r--r-- | arch/riscv/mm/ioremap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/riscv/mm/ioremap.c b/arch/riscv/mm/ioremap.c index 70ef2724cdf6..bd2f2db557cc 100644 --- a/arch/riscv/mm/ioremap.c +++ b/arch/riscv/mm/ioremap.c @@ -42,7 +42,7 @@ static void __iomem *__ioremap_caller(phys_addr_t addr, size_t size, /* Page-align mappings */ offset = addr & (~PAGE_MASK); - addr &= PAGE_MASK; + addr -= offset; size = PAGE_ALIGN(size + offset); area = get_vm_area_caller(size, VM_IOREMAP, caller); |