Re: Bug while executing : cat /proc/iomem on 2.6.17-rc1/rc2

[Maneesh Soni <maneesh@in.ibm.com>]

On Thu, May 11, 2006 at 02:08:12PM +0530, Sachin Sant wrote:
> Russell King wrote:
> 
> >Only the root should have a NULL parent, so this is just covering up some
> >other problem - you have a resource which somehow has illegally ended up
> >with a NULL parent pointer while it's been registered.
> >
> >Maybe try adding:
> >
> >		if (p->parent == NULL) {
> >			printk("resource with null parent: %lx-%lx: %s\n",
> >				p->start, p->end, p->name);
> >			break;
> >		}
> >
> >just before the test in that loop, and then finding out why that resource
> >is becoming invalid.
> >
> > 
> >
> I get this output in dmesg with the above code.
> 
> resource with null parent: 0-57ffffff: System RAM
> resource with null parent: 0-57ffffff: System RAM
> 
> x236:/home/sharyathi/linux-2.6.17-rc1/kernel # cat /proc/iomem
> 00000000-0009dbff : System RAM
> 0009dc00-0009ffff : reserved
> 000a0000-000bffff : Video RAM area
> 000c0000-000cafff : Video ROM
> 000cb000-000cc5ff : Adapter ROM
> 000f0000-000fffff : System ROM
> 00100000-c7fcb5ff : System RAM
>  00100000-004ff436 : Kernel code
>  004ff437-0068881f : Kernel data
> x236:/home/sharyathi/linux-2.6.17-rc1/kernel #
> 

Backing out 

http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=10dbe196a8da6b3196881269c6639c0ec11c36cb

solves this problem for me. This patch adds memory more than 4G to /proc/iomem
but without 64-bit fields for struct resource it ends up in confusing 
iomem_resource list. I think this patch needs the core 64-bit struct resource
related changes also.


Thanks
Maneesh