On Fri Oct 13, 2023 at 11:12 PM AEST, Christophe Leroy wrote: > > > Le 07/06/2023 à 02:56, Nicholas Piggin a écrit : > > Fix an upstream powerpc bug that was discovered with a WARN_ON added in > > "lazy tlb: consolidate lazy tlb mm switching": > > > > Switching mm and tinkering with current->active_mm should be done with > > irqs disabled. There is a path where exit_lazy_flush_tlb can be called > > with irqs enabled: > > > > exit_lazy_flush_tlb > > flush_type_needed > > __flush_all_mm > > tlb_finish_mmu > > exit_mmap > > > > Which results in the switching being incorrectly with irqs enabled. > > > > Link: https://lore.kernel.org/linuxppc-dev/87a5xcgopc.fsf@mail.lhotse/T/#m105488939d0cd9f980978ed2fdeeb89bf731e673 > > Fixes: a665eec0a22e1 ("powerpc/64s/radix: Fix mm_cpumask trimming race vs k> > > > > I will send that fix upstream, which will end up conflicting with these. > > The resolution will be to take akpm's side of the merge (with this patch). > > Or drop the patch when it conflicts and I'll resend it rebased on the fix. > > This seems to badly conflict at the moment, is it still applicable ? Been away, will have to check where all this ended up. Thanks, Nick
