Re: [PATCH] mtd: fix oops when writing to phram device on arm64

[Richard Weinberger <richard.weinberger@xxxxxxxxx>]

On Mon, Aug 19, 2019 at 3:39 PM Huaijie Yi <yihuaijie@xxxxxxxxxx> wrote:
>
> From: yihuaijie <yihuaijie@xxxxxxxxxx>
>
> memcpy() to memory remaped by ioremap() at an address not aligned
> to 8-bytes will cause oops on arm64 platform, fixing this by using
> ioremap_wc().

This might be the right thing on arm64, but I fear not for all other
archs and configurations.

We had a similar chain of problems already with our sram driver.
See:
eb43e023130b ("misc: sram: add optional ioremap without write combining")
0ab163ad1ea0 ("misc: sram: switch to ioremap_wc from ioremap")

-- 
Thanks,
//richard

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