Hi, This series contains an update to the arm64 tagged address ABI documentation posted here (v7): http://lkml.kernel.org/r/20190807155321.9648-1-catalin.marinas@xxxxxxx together some adjustments to Andrey's patches (already queued through different trees) following the discussions on the ABI documents: http://lkml.kernel.org/r/cover.1563904656.git.andreyknvl@xxxxxxxxxx If there are not objections, I propose that that patch 1 (mm: untag user pointers in mmap...) goes via the mm tree while the other 4 are routed via the arm64 tree. Changes in v8: - removed mmap/munmap/mremap/brk from the list of syscalls not accepting tagged pointers - added ioctl() to the list of syscalls not accepting tagged pointers - added shmat/shmdt to a list of syscalls not accepting tagged pointers - prctl() now requires all unused arguments to be 0 - note about two-stage ABI relaxation since even without the prctl() opt-in, the tag is still ignored on a few syscalls (untagged_addr() in the kernel is unconditional) - compilable example code together with syscall use - added a note on tag preservation in the tagged-pointers.rst document - various rewordings and cleanups Catalin Marinas (3): mm: untag user pointers in mmap/munmap/mremap/brk arm64: Tighten the PR_{SET,GET}_TAGGED_ADDR_CTRL prctl() unused arguments arm64: Change the tagged_addr sysctl control semantics to only prevent the opt-in Vincenzo Frascino (2): arm64: Define Documentation/arm64/tagged-address-abi.rst arm64: Relax Documentation/arm64/tagged-pointers.rst Documentation/arm64/tagged-address-abi.rst | 155 +++++++++++++++++++++ Documentation/arm64/tagged-pointers.rst | 23 ++- arch/arm64/kernel/process.c | 17 ++- kernel/sys.c | 4 + mm/mmap.c | 5 + mm/mremap.c | 6 +- 6 files changed, 191 insertions(+), 19 deletions(-) create mode 100644 Documentation/arm64/tagged-address-abi.rst
