Hi Russell,
> ________________________________________
> From: Russell King - ARM Linux [linux@xxxxxxxxxxxxxxxx]
> Sent: Friday, January 21, 2011 4:30 AM
> To: Aguirre, Sergio
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx
> Subject: Re: [Query] mm: !*pte hit in mm/memory.c:remap_pte_range
>
> On Thu, Jan 20, 2011 at 03:06:30PM -0600, Aguirre, Sergio wrote:
> > And while debugging further, i realized that the point of stall was
> > in mm/memory.c, function:
> >
> > static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd,
> > unsigned long addr, unsigned long end,
> > unsigned long pfn, pgprot_t prot)
> > {
> > BUG_ON(!pte_none(*pte)); <---******* HERE
> > }
> > How should i interpret this? Does this mean something specific?
>
> It is asserting that the pte we are about to overwrite was empty. In
> other words, there is no existing mapping in place at that virtual
> address.
>
> If there was a pre-existing mapping, you're doing something wrong
> because you're potentially overwriting something else.
Ok. I see.
Thanks for the detailed explanation. I appreciate it.
Regards,
Sergio
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