Re: [PATCH] ACPICA: Use uintptr_t and offsetof() in Linux kernel builds

[Arnd Bergmann]

On Tue, Jan 11, 2022 at 4:55 PM Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
>
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> To avoid "performing pointer subtraction with a null pointer has
> undefined behavior" compiler warnings, use uintptr_t and offsetof()
> that are always available during Linux kernel builds to define
> acpi_uintptr_t and the ACPI_TO_INTEGER() and ACPI_OFFSET() macros.
>
> Based on earlier proposal from Arnd Bergmann.
>
> Link: https://lore.kernel.org/linux-acpi/20210927121338.938994-1-arnd@xxxxxxxxxx
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

Thanks for the follow-up. I can't easily test this at the moment, but
it looks correct to
me. I had a different approach that I had planned to eventually
submit, but yours
looks better anyway, so let's go with this.

Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>