Re: section .data..init_task

[Sean MacLennan <smaclennan@pikatech.com>]

On Mon, 28 Jun 2010 00:59:00 -0400
Sean MacLennan <smaclennan@pikatech.com> wrote:

> Anybody else seeing these messages?
> 
> ppc_4xxFP-ld: .tmp_vmlinux1: section .data..init_task lma 0xc0374000
> overlaps previous sections ppc_4xxFP-ld: .tmp_vmlinux2:
> section .data..init_task lma 0xc03a2000 overlaps previous sections
> ppc_4xxFP-ld: vmlinux: section .data..init_task lma 0xc03a2000
> overlaps previous sections
> 
> Or does anybody know what they mean? They started showing up in
> 2.6.35.
> 
> Very easy to reproduce, so don't hesitate to ask for more info.

I had a bit of time, so I tracked this down. This patch seems to be
the culprit: http://lkml.org/lkml/2010/2/19/366

Specifically, this code:

 	/* The initial task and kernel stack */
-	.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
-		INIT_TASK_DATA(THREAD_SIZE)
-	}
+	INIT_TASK_DATA_SECTION(THREAD_SIZE)

If I change it back to:

	/* The initial task and kernel stack */
	.data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) {
		INIT_TASK_DATA(THREAD_SIZE)
	}

not only do the warnings go away, but the kernel now boots again!

Cheers,
   Sean