[U-Boot] [RFC] Add volatile back to arch_getb(a) functions

[Wolfgang Denk]

Dear Macpaul Lin,

In message <CACCg+XPxHCpX5HNVMzEGk3rEfUtV9hNHjpBtLYW809+xUH-8oA at mail.gmail.com> you wrote:
>
> I've found that there is still a problem about taking volatile off in macro
> __arch_get()/__arch_put()
> on NDS32 based platforms.
> GCC will optimized the code if the driver call x86 io emulation functions
> if there is no volatile in __arch_get().

Do not use volatile constructs.  Instead, use proper memory barrier
instructions.

> --bcaec51dd69dc100b404b25e1791
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And _please_ stop sending HTML!

Best regards,

Wolfgang Denk

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