On 2021-06-14 13:07:14 [+0200], Vlastimil Babka wrote: > > +#ifdef CONFIG_PREEMPT_RT > > +#define slub_get_cpu_ptr(var) get_cpu_ptr(var) > > +#define slub_put_cpu_ptr(var) put_cpu_ptr(var) > > After Mel's report and bisect pointing to this patch, I realized I got the > #ifdef wrong and it should be #ifnded So if you got the ifdef wrong (and kept everything as-is) then you tested the RT version on !RT. migrate_disable() behaves on !RT as on RT. As per changelog you don't use migrate_disable() unconditionally because it increases the overhead on !RT. I haven't looked at the series and I have just this tiny question: why did migrate_disable() crash for Mel on !RT and why do you expect that it does not happen on PREEMPT_RT? Sebastian
