Merge remote-tracking branch 'tip/sched/arm64' into for-next/core

* tip/sched/arm64: (785 commits)
  Documentation: arm64: describe asymmetric 32-bit support
  arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system
  arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0
  arm64: Implement task_cpu_possible_mask()
  sched: Introduce dl_task_check_affinity() to check proposed affinity
  sched: Allow task CPU affinity to be restricted on asymmetric systems
  sched: Split the guts of sched_setaffinity() into a helper function
  sched: Introduce task_struct::user_cpus_ptr to track requested affinity
  sched: Reject CPU affinity changes based on task_cpu_possible_mask()
  cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq()
  cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus()
  cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1
  sched: Introduce task_cpu_possible_mask() to limit fallback rq selection
  sched: Cgroup SCHED_IDLE support
  sched/topology: Skip updating masks for non-online nodes
  Linux 5.14-rc6
  lib: use PFN_PHYS() in devmem_is_allowed()
  ...

diff --cc Documentation/ABI/testing/sysfs-devices-system-cpu
Simple merge

diff --cc Documentation/admin-guide/kernel-parameters.txt
Simple merge

diff --cc arch/arm64/Makefile
Simple merge

diff --cc arch/arm64/kernel/cpufeature.c
Simple merge

diff --cc arch/arm64/kernel/process.c
index 5464d57,e0e7f4e..2bd270c
--- 1/arch/arm64/kernel/process.c
--- 2/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@@ -472,22 -469,7 +473,13 @@@ static void erratum_1418040_thread_swit
        write_sysreg(val, cntkctl_el1);
  }
  
- static void compat_thread_switch(struct task_struct *next)
- {
-       if (!is_compat_thread(task_thread_info(next)))
-               return;
- 
-       if (static_branch_unlikely(&arm64_mismatched_32bit_el0))
-               set_tsk_thread_flag(next, TIF_NOTIFY_RESUME);
- }
- 
 -static void update_sctlr_el1(u64 sctlr)
 +/*
 + * __switch_to() checks current->thread.sctlr_user as an optimisation. Therefore
 + * this function must be called with preemption disabled and the update to
 + * sctlr_user must be made in the same preemption disabled block so that
 + * __switch_to() does not see the variable update before the SCTLR_EL1 one.
 + */
 +void update_sctlr_el1(u64 sctlr)
  {
        /*
         * EnIA must not be cleared while in the kernel as this is necessary for

diff --cc arch/arm64/kernel/ptrace.c
Simple merge

diff --cc arch/arm64/kernel/signal.c
index e93ffd7,22899c8..fb54fb7
--- 1/arch/arm64/kernel/signal.c
--- 2/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@@ -916,20 -912,8 +917,7 @@@ static void do_signal(struct pt_regs *r
        restore_saved_sigmask();
  }
  
- static bool cpu_affinity_invalid(struct pt_regs *regs)
- {
-       if (!compat_user_mode(regs))
-               return false;
- 
-       /*
-        * We're preemptible, but a reschedule will cause us to check the
-        * affinity again.
-        */
-       return !cpumask_test_cpu(raw_smp_processor_id(),
-                                system_32bit_el0_cpumask());
- }
- 
 -asmlinkage void do_notify_resume(struct pt_regs *regs,
 -                               unsigned long thread_flags)
 +void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags)
  {
        do {
                if (thread_flags & _TIF_NEED_RESCHED) {