Re: [PATCH RESEND] x86/smpboot: Unbreak CPU0 hotplug

2017-08-14 Thread Thomas Gleixner
On Thu, 10 Aug 2017, Ingo Molnar wrote: > * Vitaly Kuznetsov wrote: > > I haven't received a single comment on this since the initial submission > > on June, 26 - is it so bad? :-) Sorry slipped through the cracks. > So the fix looks good to me at first sight, but wanted to wait for Thomas to >

Re: [PATCH RESEND] x86/smpboot: Unbreak CPU0 hotplug

2017-08-10 Thread Vitaly Kuznetsov
Ingo Molnar writes: > * Vitaly Kuznetsov wrote: > >> Vitaly Kuznetsov writes: >> >> > A hang on CPU0 onlining after a preceding offlining is observed. Trace >> > shows that CPU0 is stuck in check_tsc_sync_target() waiting for source >> > CPU to run check_tsc_sync_source() but this never happen

Re: [PATCH RESEND] x86/smpboot: Unbreak CPU0 hotplug

2017-08-10 Thread Ingo Molnar
* Vitaly Kuznetsov wrote: > Vitaly Kuznetsov writes: > > > A hang on CPU0 onlining after a preceding offlining is observed. Trace > > shows that CPU0 is stuck in check_tsc_sync_target() waiting for source > > CPU to run check_tsc_sync_source() but this never happens. Source CPU, > > in its tur

Re: [PATCH RESEND] x86/smpboot: Unbreak CPU0 hotplug

2017-08-10 Thread Vitaly Kuznetsov
Vitaly Kuznetsov writes: > A hang on CPU0 onlining after a preceding offlining is observed. Trace > shows that CPU0 is stuck in check_tsc_sync_target() waiting for source > CPU to run check_tsc_sync_source() but this never happens. Source CPU, > in its turn, is stuck on synchronize_sched() which