Changelog since v1 o Remove preempt_[en|dis]able_rt helper When adding local_lock support to mm/page_alloc.c and reducing the overhead of vmstats in general, I wondered how vmstats could be safe on PREEMPT_RT as it partially relies on interrupts being disabled for the stats that must be accurate for correctness. As it turns out, the preempt-rt tree already encountered the same problem. This series protects just the accurate counters. As Thomas expressed concern that the preempt_enable_rt() helper could be abused, this version open-codes the preemption with a comment explaining why it is necessary. This is specific to PREEMPT_RT which cannot be enabled on mainline yet and should have no impact on !PREEMPT_RT kernels. This patch replaces the following mmotm patches o preempt-provide-preempt__nort-variants.patch o mm-vmstat-protect-per-cpu-variables-with-preempt-disable-on-rt.patch -- 2.31.1
