From: Bob Picco <bpicco@xxxxxxxxxx>
Date: Mon, 30 Sep 2013 10:22:43 -0400
> Hi,
> David Miller wrote: [Sat Sep 28 2013, 03:34:12PM EDT]
>> From: Gurudas Pai <gurudas.pai@xxxxxxxxxx>
>> Date: Fri, 27 Sep 2013 21:07:11 -0700
>>
>> > This is on a t4-1, machine becomes unusable with hundreds of
>> > "WARNING: CPU: 0 PID: 441 at mm/mmap.c:2729 exit_mmap+0x14c/0x160()"
>>
>> Strange, it boots perfectly fine on my T4-2. Can you reply to
>> this email with the ".config" you used?
>>
>> Also, did you make sure to have the PAGE_OFFSET patches applied
>> first? They are a prerequisite for this series.
>>
>> Thanks.
> It seems to be the forever confusing MMU hole. Debian wheezy has no issue with
> the patch below.
Yes, that is the patch I was just about to test as well:
> @@ -101,7 +101,7 @@ typedef pte_t *pgtable_t;
> * the actual exclusion region we enforce, wherein we use a 4GB red
> * zone on each side of the VA hole.
> */
> -#define SPARC64_VA_HOLE_TOP _AC(0xfffff80000000000,UL)
> +#define SPARC64_VA_HOLE_TOP _AC(0xfffffc0000000000,UL)
> #define SPARC64_VA_HOLE_BOTTOM _AC(0x0000080000000000,UL)
You have to adjust VA_HOLE_BOTTOM as well, shifting it down by one bit,
to be complete.
So my calculations were off by one, we need 44-bits to support the
current SPARC64_VA_HOLE_{TOP,BOTTOM} settings.
Anyways, I'm going to respin my series with minor adjustments plus
the VA_HOLE changes and post them here.
Thanks.
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