Re: [PATCH linux dev-4.10 3/6] drivers/misc: Add driver for Aspeed PECI and generic PECI headers

[Benjamin Herrenschmidt]

On Tue, 2018-01-09 at 14:31 -0800, Jae Hyun Yoo wrote:
> +struct peci_rd_ia_msr_msg {
> +       unsigned char target;
> +       unsigned char thread_id;
> +       unsigned short address;
> +       unsigned long value;
> +};

Those types are representing messages on the wire ?

In that case those types aren't suitable. For example "long" will have
a different size and alignment for 32 and 64-bit userspace. There are
size-explicit userspace types available.

Also I didn't see any endianness annotations in there. Is that expected
? IE are those wire format packets ?

Cheers,
Ben.