Hello folks, Here's version four of the wonderful patches I 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 and which started life as a reimplementation of some patches from Qais: https://lore.kernel.org/r/20201021104611.2744565-1-qais.yousef@xxxxxxx The aim of this series is to allow 32-bit ARM applications to run on arm64 SoCs where not all of the CPUs support the 32-bit instruction set. Unfortunately, such SoCs are real and will continue to be productised over the next few years at least. Changes in v4 include: * Take into account the cpuset 'allowed' mask on exec * Print a warning if we forcefully override the affinity, like we do in select_fallback_rq() * Rename arch_cpu_allowed_mask() to arch_task_cpu_possible_mask() * Added a comment to adjust_compat_task_affinity() 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: Li Zefan <lizefan@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Juri Lelli <juri.lelli@xxxxxxxxxx> Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx> Cc: kernel-team@xxxxxxxxxxx --->8 Will Deacon (14): arm64: cpuinfo: Split AArch32 registers out into a separate struct arm64: Allow mismatched 32-bit EL0 support KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs arm64: Advertise CPUs capable of running 32-bit applications in sysfs arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 sched: Introduce restrict_cpus_allowed_ptr() to limit task CPU affinity arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 sched: Introduce arch_task_cpu_possible_mask() to limit fallback rq selection sched: Reject CPU affinity changes based on arch_task_cpu_possible_mask() arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system arm64: Implement arch_task_cpu_possible_mask() arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores .../ABI/testing/sysfs-devices-system-cpu | 9 + .../admin-guide/kernel-parameters.txt | 7 + arch/arm64/include/asm/cpu.h | 44 ++-- arch/arm64/include/asm/cpucaps.h | 2 +- arch/arm64/include/asm/cpufeature.h | 8 +- arch/arm64/include/asm/mmu_context.h | 13 ++ arch/arm64/kernel/cpufeature.c | 219 ++++++++++++++---- arch/arm64/kernel/cpuinfo.c | 53 +++-- arch/arm64/kernel/process.c | 47 +++- arch/arm64/kvm/arm.c | 11 +- include/linux/sched.h | 1 + kernel/cgroup/cpuset.c | 6 +- kernel/sched/core.c | 90 +++++-- 13 files changed, 401 insertions(+), 109 deletions(-) -- 2.29.2.454.gaff20da3a2-goog
