Hi All, I'm planning to implement lazy mmu mode for arm64 to optimize vmalloc. As part of that, I will extend lazy mmu mode to cover kernel mappings in vmalloc table walkers. While lazy mmu mode is already used for kernel mappings in a few places, this will extend it's use significantly. Having reviewed the existing lazy mmu implementations in powerpc, sparc and x86, it looks like there are a bunch of bugs, some of which may be more likely to trigger once I extend the use of lazy mmu. So this series attempts to clarify the requirements and fix all the bugs in advance of that series. See patch #1 commit log for all the details. Note that I have only been able to compile test these changes but I think they are in good enough shape for some linux-next testing. Applies on Friday's mm-unstable (5f089a9aa987), as I assume this would be preferred via that tree. Changes since v1 ================ - split v1 patch #1 into v2 patch #1 and #2; per David - Added Acked-by tags from David and Andreas; Thanks! - Refined the patches which are truely fixes and added to stable to cc Thanks, Ryan Ryan Roberts (5): mm: Fix lazy mmu docs and usage fs/proc/task_mmu: Reduce scope of lazy mmu region sparc/mm: Disable preemption in lazy mmu mode sparc/mm: Avoid calling arch_enter/leave_lazy_mmu() in set_ptes Revert "x86/xen: allow nesting of same lazy mode" arch/sparc/include/asm/pgtable_64.h | 2 -- arch/sparc/mm/tlb.c | 5 ++++- arch/x86/include/asm/xen/hypervisor.h | 15 ++------------- arch/x86/xen/enlighten_pv.c | 1 - fs/proc/task_mmu.c | 11 ++++------- include/linux/pgtable.h | 14 ++++++++------ 6 files changed, 18 insertions(+), 30 deletions(-) -- 2.43.0
