On 2020-04-05 06:53:43 [+0200], Mike Galbraith wrote: > Hi Sebastian, Hi Mike, > Just a heads up wrt $subject... > > I had done the same in my 5.6 tree, but then 5.7 came along, and I had > to revisit due to 34c881745549e adding an allocation under that lock > with irqs disabled. The same commit that added the lock added this. > > local_irq_save(flags); // For safely calling this_cpu_ptr(). > > Whacking that instead of converting the lock cures 5.6 and 5.7 woes. So I think you are telling me that I made the lock raw and then they added in v5.7 a __get_free_page() call in kfree_call_rcu_add_ptr_to_bulk() which is invoked from the free path. This is indeed not something that made me happy. Now let me think about this for a moment… > -Mike Sebastian
