linux-kernel - drivers/pci/probe.c compile warnings on -tip

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Date:	Wed, 1 Oct 2008 01:02:06 -0700
From:	"Steven Noonan" <steven@...inklabs.net>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Hugh Dickins" <hugh@...itas.com>,
	"Jesse Barnes" <jbarnes@...tuousgeek.org>
Subject: drivers/pci/probe.c compile warnings on -tip

I was hunting down some warnings I got when compiling -tip, and with
one of them, I'm not sure what would be a proper way to handle it.

If CONFIG_PHYS_ADDR_T_64BIT is not enabled, these warnings show up:

drivers/pci/probe.c: In function '__pci_read_base':
drivers/pci/probe.c:308: warning: format '%llx' expects type 'long
long unsigned int', but argument 4 has type 'resource_size_t'
drivers/pci/probe.c:308: warning: format '%llx' expects type 'long
long unsigned int', but argument 5 has type 'resource_size_t'
drivers/pci/probe.c:320: warning: format '%llx' expects type 'long
long unsigned int', but argument 5 has type 'resource_size_t'
drivers/pci/probe.c:320: warning: format '%llx' expects type 'long
long unsigned int', but argument 6 has type 'resource_size_t'
drivers/pci/probe.c: In function 'pci_read_bridge_bases':
drivers/pci/probe.c:392: warning: format '%llx' expects type 'long
long unsigned int', but argument 3 has type 'resource_size_t'
drivers/pci/probe.c:392: warning: format '%llx' expects type 'long
long unsigned int', but argument 4 has type 'resource_size_t'
drivers/pci/probe.c:405: warning: format '%llx' expects type 'long
long unsigned int', but argument 3 has type 'resource_size_t'
drivers/pci/probe.c:405: warning: format '%llx' expects type 'long
long unsigned int', but argument 4 has type 'resource_size_t'
drivers/pci/probe.c:443: warning: format '%llx' expects type 'long
long unsigned int', but argument 4 has type 'resource_size_t'
drivers/pci/probe.c:443: warning: format '%llx' expects type 'long
long unsigned int', but argument 5 has type 'resource_size_t'


Each of the lines is something like this:

printk(KERN_DEBUG "PCI: %s reg %x 64bit mmio: [%llx, %llx]\n",
pci_name(dev), pos, res->start, res->end);

res->start and res->end are resource_size_t (which is phys_addr_t),
and are sized either 32-bit or 64-bit, based on whether
CONFIG_PHYS_ADDR_T_64BIT is set. So, it seems to me that something
like these would be horrendously bad solutions (for obvious reasons,
like readability):

#ifdef CONFIG_PHYS_ADDR_T_64BIT
printk(KERN_DEBUG "PCI: %s reg %x 64bit mmio: [%llx, %llx]\n",
pci_name(dev), pos, res->start, res->end);
#else
printk(KERN_DEBUG "PCI: %s reg %x 64bit mmio: [%lx, %lx]\n",
pci_name(dev), pos, res->start, res->end);
#endif

or

#ifdef CONFIG_PHYS_ADDR_T_64BIT
printk(KERN_DEBUG "PCI: %s reg %x 64bit mmio: [%llx, %llx]\n",
pci_name(dev), pos, res->start, res->end);
#endif

What's the appropriate way to handle it? Moreover, are those printk's
even truly necessary?

- Steven
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