linux-kernel - Re: [PATCH 5/5] RISC-V: Avoid corrupting the upper 32-bit of phys_addr

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Message-ID: <20180921070059.GD8401@infradead.org>
Date:   Fri, 21 Sep 2018 00:00:59 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Zong Li <zongbox@...il.com>
Cc:     palmer@...ive.com, aou@...s.berkeley.edu, vincentc@...estech.com,
        zong@...estech.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] RISC-V: Avoid corrupting the upper 32-bit of
 phys_addr_t in ioremap

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

Looks fine,

Reviewed-by: Christoph Hellwig <hch@....de>