Hi everyone, This is version eleven of the patches previously posted here: v1: https://lore.kernel.org/r/20201027215118.27003-1-will@xxxxxxxxxx v2: https://lore.kernel.org/r/20201109213023.15092-1-will@xxxxxxxxxx v3: https://lore.kernel.org/r/20201113093720.21106-1-will@xxxxxxxxxx v4: https://lore.kernel.org/r/20201124155039.13804-1-will@xxxxxxxxxx v5: https://lore.kernel.org/r/20201208132835.6151-1-will@xxxxxxxxxx v6: https://lore.kernel.org/r/20210518094725.7701-1-will@xxxxxxxxxx v7: https://lore.kernel.org/r/20210525151432.16875-1-will@xxxxxxxxxx v8: https://lore.kernel.org/r/20210602164719.31777-1-will@xxxxxxxxxx v9: https://lore.kernel.org/r/20210608180313.11502-1-will@xxxxxxxxxx v10: https://lore.kernel.org/r/20210623173848.318-1-will@xxxxxxxxxx The main changes since v10 are: * Now based on v5.14-rc1 * Fixed a lockup found during testing where select_fallback_rq() could return an invalid CPU when trying to prioritise a destination on the same NUMA node Greg kindly pointed out a potential issue with the new 'aarch32_el0' file in sysfs, where the contents will be truncated if we need to display more than a PAGE_SIZE of data. However, I have elected not to address this for now as (a) I do not think we'll ever have hardware in that configuration (yeah, I know...) and (b) It is useful for scripts if the file behaves the same as the other files in the same directory (e.g. 'online'). Should a solution to this problem emerge for the other files, I will be happy to adopt it here as well. This series is now mostly scheduler stuff, but the last few patches are arm64 and so I would suggest a shared branch in -tip for merging. Cheers, Will Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Marc Zyngier <maz@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Morten Rasmussen <morten.rasmussen@xxxxxxx> Cc: Qais Yousef <qais.yousef@xxxxxxx> Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx> Cc: Quentin Perret <qperret@xxxxxxxxxx> Cc: Tejun Heo <tj@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Juri Lelli <juri.lelli@xxxxxxxxxx> Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx> Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx> Cc: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> Cc: Valentin Schneider <valentin.schneider@xxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: kernel-team@xxxxxxxxxxx --->8 Will Deacon (16): sched: Introduce task_cpu_possible_mask() to limit fallback rq selection cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq() sched: Reject CPU affinity changes based on task_cpu_possible_mask() sched: Introduce task_struct::user_cpus_ptr to track requested affinity sched: Split the guts of sched_setaffinity() into a helper function sched: Allow task CPU affinity to be restricted on asymmetric systems sched: Introduce dl_task_check_affinity() to check proposed affinity arm64: Implement task_cpu_possible_mask() arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system arm64: Advertise CPUs capable of running 32-bit applications in sysfs arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Documentation: arm64: describe asymmetric 32-bit support .../ABI/testing/sysfs-devices-system-cpu | 9 + .../admin-guide/kernel-parameters.txt | 11 + Documentation/arm64/asymmetric-32bit.rst | 155 ++++++++ Documentation/arm64/index.rst | 1 + arch/arm64/include/asm/elf.h | 6 +- arch/arm64/include/asm/mmu_context.h | 13 + arch/arm64/kernel/cpufeature.c | 51 ++- arch/arm64/kernel/process.c | 47 ++- arch/arm64/kernel/signal.c | 26 -- include/linux/cpuset.h | 8 +- include/linux/mmu_context.h | 14 + include/linux/sched.h | 21 ++ init/init_task.c | 1 + kernel/cgroup/cpuset.c | 59 ++- kernel/fork.c | 2 + kernel/sched/core.c | 344 ++++++++++++++---- kernel/sched/sched.h | 1 + 17 files changed, 628 insertions(+), 141 deletions(-) create mode 100644 Documentation/arm64/asymmetric-32bit.rst -- 2.32.0.402.g57bb445576-goog
