linux-kernel - Re: [PATCH v3 5/5] RISC-V: Avoid corrupting the upper 32-bit of phys_addr

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Date:   Wed, 3 Oct 2018 11:26:43 +0800
From:   Zong Li <zongbox@...il.com>
To:     hch@...radead.org
Cc:     Palmer Dabbelt <palmer@...ive.com>, aou@...s.berkeley.edu,
        Zong Li <zong@...estech.com>, linux-riscv@...ts.infradead.org,
        Vincent Chen <vincentc@...estech.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/5] RISC-V: Avoid corrupting the upper 32-bit of
 phys_addr_t in ioremap

Christoph Hellwig <hch@...radead.org> 於 2018年10月2日 週二 下午10:51寫道：
>
> On Tue, Oct 02, 2018 at 04:52:31PM +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 good,
>
> Reviewed-by: Christoph Hellwig <hch@....de>
>
> (and I'm pretty sure I reviewed this before..)

Hi Christoph,

Very sorry about that. I didn't notice I lose these review tags. Could
you please help to review again in version 4 patches? Thank you.

Regards,
Zong