This moves use_mm/unuse_mm from aio into mm, and optimizes atomic usage there. Original patchset also exported use_mm/unuse_mm to modules, for use by vhost, that bit will come in later when vhost is posted for inclusion. Michael S. Tsirkin (2): mm: move use_mm/unuse_mm from aio.c to mm/ mm: reduce atomic use on use_mm fast path fs/aio.c | 47 +---------------------------------- include/linux/mmu_context.h | 9 ++++++ mm/Makefile | 2 +- mm/mmu_context.c | 58 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 69 insertions(+), 47 deletions(-) create mode 100644 include/linux/mmu_context.h create mode 100644 mm/mmu_context.c