Re: [Qestion] Softlockup when send IPI to other CPUs

Catalin Marinas
2019-01-24T16:37:54Z

Hi Shijith,

On Thu, Jan 24, 2019 at 07:00:42AM +0000, Shijith Thotton wrote:
> On 01/23/2019 11:45 PM, Catalin Marinas wrote:
> > diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
> > index 30695a868107..5c9073bace83 100644
> > --- a/arch/arm64/mm/flush.c
> > +++ b/arch/arm64/mm/flush.c
> > @@ -33,7 +33,11 @@ void sync_icache_aliases(void *kaddr, unsigned long len)
> > __clean_dcache_area_pou(kaddr, len);
> > __flush_icache_all();
> > } else {
> > - flush_icache_range(addr, addr + len);
> > + /*
> > + * Don't issue kick_all_cpus_sync() after I-cache invalidation
> > + * for user mappings.
> > + */
> > + __flush_icache_range(addr, addr + len);
> > }
> > }
>
> We also faced similar issue with LTP test migrate_pages03 in past and this patch
> fixes the issue.
>
> http://lists.infradead.org/pipermail/linux-arm-kernel/2019-January/623574.html

Thanks for confirming. I presume I can add your tested-by.

--
Catalin