Re: 2.6.15-rc5-mm3 -- BUG: using smp_processor_id() in preemptible[00000001] code: swapper/1

[Nick Piggin]

Andrew Morton wrote:

> > A little later, I get this:
> >
> > [4294676.542000] BUG: using smp_processor_id() in preemptible
> > [00000001] code: rcS/942
> > [4294676.542000] caller is mod_page_state_offset+0x12/0x28
> > [4294676.542000]  [<c1003723>] dump_stack+0x16/0x1a
> > [4294676.554000]  [<c110c1eb>] debug_smp_processor_id+0x77/0x90
> > [4294676.565000]  [<c10413d3>] mod_page_state_offset+0x12/0x28
> > [4294676.577000]  [<c104911b>] __handle_mm_fault+0x1f/0x18e
> > [4294676.589000]  [<c1013d7f>] do_page_fault+0x170/0x492
> > [4294676.600000]  [<c10033f7>] error_code+0x4f/0x54
> > [4294676.612000]  [<c10027ae>] ret_from_fork+0x6/0x14
>
>
> Nick.

Silly me, it is doing the local_irq_save *after* the __get_cpu_var.
Sorry for the typo. However the bug is harmless and will just result
in skewed statistics in the very rare chance of a race.

Thanks for reporting.

--
SUSE Labs, Novell Inc.

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