Re: [PATCH 5/5] RISC-V: Avoid corrupting the upper 32-bit of phys_addr_t in ioremap

[Christoph Hellwig]

On Tue, Sep 18, 2018 at 05:19:17PM +0800, Zong Li wrote:
> From: Vincent Chen <vincentc@xxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxx>

Looks fine,

Reviewed-by: Christoph Hellwig <hch@xxxxxx>