Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 updates from Will Deacon:
 "Mostly just incremental improvements here:

   - Introduce AT_HWCAP2 for advertising CPU features to userspace

   - Expose SVE2 availability to userspace

   - Support for "data cache clean to point of deep persistence" (DC PODP)

   - Honour "mitigations=off" on the cmdline and advertise status via
     sysfs

   - CPU timer erratum workaround (Neoverse-N1 #1188873)

   - Introduce perf PMU driver for the SMMUv3 performance counters

   - Add config option to disable the kuser helpers page for AArch32 tasks

   - Futex modifications to ensure liveness under contention

   - Rework debug exception handling to seperate kernel and user
     handlers

   - Non-critical fixes and cleanup"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (92 commits)
  Documentation: Add ARM64 to kernel-parameters.rst
  arm64/speculation: Support 'mitigations=' cmdline option
  arm64: ssbs: Don't treat CPUs with SSBS as unaffected by SSB
  arm64: enable generic CPU vulnerabilites support
  arm64: add sysfs vulnerability show for speculative store bypass
  arm64: Fix size of __early_cpu_boot_status
  clocksource/arm_arch_timer: Use arch_timer_read_counter to access stable counters
  clocksource/arm_arch_timer: Remove use of workaround static key
  clocksource/arm_arch_timer: Drop use of static key in arch_timer_reg_read_stable
  clocksource/arm_arch_timer: Direcly assign set_next_event workaround
  arm64: Use arch_timer_read_counter instead of arch_counter_get_cntvct
  watchdog/sbsa: Use arch_timer_read_counter instead of arch_counter_get_cntvct
  ARM: vdso: Remove dependency with the arch_timer driver internals
  arm64: Apply ARM64_ERRATUM_1188873 to Neoverse-N1
  arm64: Add part number for Neoverse N1
  arm64: Make ARM64_ERRATUM_1188873 depend on COMPAT
  arm64: Restrict ARM64_ERRATUM_1188873 mitigation to AArch32
  arm64: mm: Remove pte_unmap_nested()
  arm64: Fix compiler warning from pte_unmap() with -Wunused-but-set-variable
  arm64: compat: Reduce address limit for 64K pages
  ...

1 files changed, 13 insertions, 12 deletions

diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c
index 2ae76026e947..0bb52d9bdcf7 100644
--- a/drivers/perf/arm-ccn.c
+++ b/drivers/perf/arm-ccn.c
@@ -167,7 +167,7 @@ struct arm_ccn_dt {
 
         struct hrtimer hrtimer;
 
-        cpumask_t cpu;
+        unsigned int cpu;
         struct hlist_node node;
 
         struct pmu pmu;
@@ -559,7 +559,7 @@ static ssize_t arm_ccn_pmu_cpumask_show(struct device *dev,
 {
         struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev));
 
-        return cpumap_print_to_pagebuf(true, buf, &ccn->dt.cpu);
+        return cpumap_print_to_pagebuf(true, buf, cpumask_of(ccn->dt.cpu));
 }
 
 static struct device_attribute arm_ccn_pmu_cpumask_attr =
@@ -759,7 +759,7 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
          * mitigate this, we enforce CPU assignment to one, selected
          * processor (the one described in the "cpumask" attribute).
          */
-        event->cpu = cpumask_first(&ccn->dt.cpu);
+        event->cpu = ccn->dt.cpu;
 
         node_xp = CCN_CONFIG_NODE(event->attr.config);
         type = CCN_CONFIG_TYPE(event->attr.config);
@@ -1215,15 +1215,15 @@ static int arm_ccn_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
         struct arm_ccn *ccn = container_of(dt, struct arm_ccn, dt);
         unsigned int target;
 
-        if (!cpumask_test_and_clear_cpu(cpu, &dt->cpu))
+        if (cpu != dt->cpu)
                 return 0;
         target = cpumask_any_but(cpu_online_mask, cpu);
         if (target >= nr_cpu_ids)
                 return 0;
         perf_pmu_migrate_context(&dt->pmu, cpu, target);
-        cpumask_set_cpu(target, &dt->cpu);
+        dt->cpu = target;
         if (ccn->irq)
-                WARN_ON(irq_set_affinity_hint(ccn->irq, &dt->cpu) != 0);
+                WARN_ON(irq_set_affinity_hint(ccn->irq, cpumask_of(dt->cpu)));
         return 0;
 }
 
@@ -1299,29 +1299,30 @@ static int arm_ccn_pmu_init(struct arm_ccn *ccn)
         }
 
         /* Pick one CPU which we will use to collect data from CCN... */
-        cpumask_set_cpu(get_cpu(), &ccn->dt.cpu);
+        ccn->dt.cpu = raw_smp_processor_id();
 
         /* Also make sure that the overflow interrupt is handled by this CPU */
         if (ccn->irq) {
-                err = irq_set_affinity_hint(ccn->irq, &ccn->dt.cpu);
+                err = irq_set_affinity_hint(ccn->irq, cpumask_of(ccn->dt.cpu));
                 if (err) {
                         dev_err(ccn->dev, "Failed to set interrupt affinity!\n");
                         goto error_set_affinity;
                 }
         }
 
+        cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CCN_ONLINE,
+                                         &ccn->dt.node);
+
         err = perf_pmu_register(&ccn->dt.pmu, name, -1);
         if (err)
                 goto error_pmu_register;
 
-        cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CCN_ONLINE,
-                                         &ccn->dt.node);
-        put_cpu();
         return 0;
 
 error_pmu_register:
+        cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_CCN_ONLINE,
+                                            &ccn->dt.node);
 error_set_affinity:
-        put_cpu();
 error_choose_name:
         ida_simple_remove(&arm_ccn_pmu_ida, ccn->dt.id);
         for (i = 0; i < ccn->num_xps; i++)