Re: [PATCH] acpiphp: Match the variable types for ia64

[Matthew Wilcox <matthew@wil.cx>]

On Fri, Sep 12, 2008 at 05:03:50PM +0000, Chen, Justin wrote:
> >>                 slot->device = device;
> >> -               slot->sun = sun;
> >> +               slot->sun = (u64) sun;
> >
> >No ... the right thing to do here is make the local variable
> >'sun' a u64.  adr ought to be a u32, not an unsigned long.
> 
> If I understand your concern right, you want to change the local
> variable 'sun' in the routine register_slot() in the file acpiphp_glue.c
> from unsigned long to u64.  If that's the case, it will introduce the
> other issue that since the 'sun' is passed as the argument 4 of the
> routine acpi_evaluate_integer() and it is taking the unsigned long,
> what's the point to define 'sun' in u64?

Ooh, I think you've found a bug in the ACPI-CA.

Consider this:

/*
 * Acpi integer width. In ACPI version 1, integers are 32 bits.  In ACPI
 * version 2, integers are 64 bits. Note that this pertains to the ACPI integer
 * type only, not other integers used in the implementation of the ACPI CA
 * subsystem.
 */
typedef unsigned long long acpi_integer;

and compare and contrast it with this:

acpi_status
acpi_evaluate_integer(acpi_handle handle,
                      acpi_string pathname,
                      struct acpi_object_list *arguments, unsigned long *data);

I would argue 'data' should be an 'acpi_integer *', not an 'unsigned long *'
Len?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."