On Thu, 2012-05-17 at 10:51 +0100, Russell King wrote: > On Thu, May 17, 2012 at 10:30:23AM +0100, Catalin Marinas wrote: > > Another minor thing is that on newer ARM processors (Cortex-A15) we > > need the TLB shootdown even on UP systems, so tlb_fast_mode should > > always return 0. Something like below (untested): > > No Catalin, we need this for virtually all ARMv7 CPUs whether they're UP > or SMP, not just for A15, because of the speculative prefetch which can > re-load TLB entries from the page tables at _any_ time. Hmm,. so this is mostly because of the confusion/coupling between tlb_remove_page() and tlb_remove_table() I guess. Since I don't see the freeing of the actual pages being a problem with speculative TLB reloads, just the page-tables. Should we introduce a tlb_remove_table() regardless of HAVE_RCU_TABLE_FREE which always queues the tables regardless of tlb_fast_mode()? -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
