[Dri-devel] PPC Lockup (ati-pcigart-branch)

[Paul Mackerras]

Michel =?iso-8859-1?Q?D=81=E4nzer?= writes:

> I've narrowed down the problem by modifying the code like this:
>
>         for ( i = entry->handle, j = 0 ; j < pages ; i += PAGE_SIZE, j++ ) {
>                 printk("i: %08lx\n", i);
>                 pgd = pgd_offset_k( i );
>                 printk("pgd: %08lx\n", pgd);
>                 pmd = pmd_offset( pgd, i );
>                 printk("pmd: %08lx\n", pmd);
>                 pte = pte_offset( pmd, i );
>                 printk("pte: %08lx\n", pte);
[snip]
> The kernel output is as follows:
>
> [drm] drm_sg_alloc
> i: ca292000
> pgd: c014dca0
> pmd: c014dca0
> pte: 00000a48

Which means that *pgd == 0, which is very odd indeed, unless of course
you have run off the end of the vmalloc'd area (I assume you haven't).
What is the value of the symbol swapper_pg_dir in this kernel?
Have you tried accessing the vmalloc'd area?  Where did you get the
kernel source?

I hope to get to have a good look at the drm code myself shortly.

Paul.

--
Paul Mackerras, Open Source Research Fellow, Linuxcare, Inc.
+61 2 6262 8990 tel, +61 2 6262 8991 fax
paulus at linuxcare.com.au, http://www.linuxcare.com.au/
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