On Thu, 20 Sep 2018, Pu Wen wrote: > On 2018/9/20 8:26, Rong Chen wrote: > > On 09/19/2018 09:53 PM, Pu Wen wrote: > > > I cannot reproduce this panic on Hygon Dhyana platform. I tired lkp-tests > > > both in Ubuntu 16.04 (with gcc-5) and Ubuntu 18.04 (with gcc-7). > > > What kind of host do you use to run the qemu? A Intel one or AMD one? > > It's a Intel one, > > > > model: Nehalem-EX > > memory: 224G > > nr_node: 4 > > nr_cpu: 64 > > nr_socket: 4 > > brand: Intel(R) Xeon(R) CPU X7560 @ 2.27GHz > > I reproduced the PANIC by running lkp-tests with a Intel machine. > > The reason is that the function early_is_amd_nb is called even if > running on Intel machine. At this case the misc_ids is NULL so the > PANIC occur. > > I'll rework a patch to solve this problem, either restore the default > value of misc_ids with the original AMD one or not call early_is_amd_nb > on Intel platform. Return when !AMD and !HYGON is the right thing to do. No point in checking device ids which cannot happen in the first place. Thanks, tglx
