On Sun, 2006-04-30 at 06:45 +0000, Pavel Machek wrote:
> Hi!
>
> > flush_tlb_all uses on_each_cpu, which will disable/enable interrupt.
> > In suspend/resume time, this will make interrupt wrongly enabled.
>
> > diff -puN arch/i386/mm/init.c~flush_tlb_all_check arch/i386/mm/init.c
> > --- linux-2.6.17-rc3/arch/i386/mm/init.c~flush_tlb_all_check 2006-04-29 08:47:05.000000000 +0800
> > +++ linux-2.6.17-rc3-root/arch/i386/mm/init.c 2006-04-29 08:48:15.000000000 +0800
> > @@ -420,7 +420,10 @@ void zap_low_mappings (void)
> > #else
> > set_pgd(swapper_pg_dir+i, __pgd(0));
> > #endif
> > - flush_tlb_all();
> > + if (cpus_weight(cpu_online_map) == 1)
> > + local_flush_tlb();
> > + else
> > + flush_tlb_all();
> > }
> >
>
> Either it is okay to enable interrupts here -> unneccessary and ugly
> test, or it is not, and then we are broken in SMP case.
It's not broken in SMP case, APs are offlined here in suspend/resume.
Thanks,
Shaohua
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