linux-kernel - Re: [PATCH] Fix up a multitude of ACPI compiler warnings on x86

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Date:	Fri, 29 Sep 2006 16:18:52 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Andrew Morton <akpm@...l.org>, len.brown@...el.com
Cc:	Martin Bligh <mbligh@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH] Fix up a multitude of ACPI compiler warnings on x86_64

On Fri, 29 Sep 2006 15:05:26 -0700 Andrew Morton wrote:

> On Fri, 29 Sep 2006 14:37:58 -0700
> Martin Bligh <mbligh@...gle.com> wrote:
> 
> > 32bit vs 64 bit issues. sizeof(sizeof) and sizeof(pointer) is variable,
> > but we're trying to shove it into unsigned int or u32.
> >
> > ...
> >
> > -	"RSDT/XSDT length (%X) is smaller than minimum (%X)",
> > +	"RSDT/XSDT length (%X) is smaller than minimum (%lX)",
> >  	table_ptr->length,
> > -	sizeof(struct acpi_table_header)));
> > +	(unsigned long) sizeof(struct acpi_table_header)));
> > 
> 
> These two sizeof()s have already been fixed by Randy in -mm's
> acpi-fix-printk-format-warnings.patch.
> 
> Randy's fix is the preferred one: sizeof() returns size_t and size_t's are
> printed with %z - there's no need to use a typecast.
> 
> (Actually Randy used %Z which avoids the warning which old gcc emitted with
> %z, but is old-fashioned.  I'll switch that to %z).
> 
> 
> acpi-fix-printk-format-warnings.patch was submitted to the ACPI developers
> on August 14 and on September 25 but remains unmerged.

Len and I discussed that patch some.  The question about it is:
why does gcc report this at all?  Is this a gcc problem or are
we misreading it somehow?

 drivers/acpi/tables/tbget.c: In function 'acpi_tb_get_this_table':
drivers/acpi/tables/tbget.c:326: warning: format '%X' expects type 'unsigned int', but argument 5 has type 'long unsigned int'

drivers/acpi/tables/tbrsdt.c: In function 'acpi_tb_validate_rsdt':
drivers/acpi/tables/tbrsdt.c:189: warning: format '%X' expects type 'unsigned int', but argument 5 has type 'long unsigned int'

Why does it think that sizeof(struct X) is long unsigned int?
(and only on 64-bit)

---
~Randy
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