Merge tag 'v4.2-rc7' into drm-next

Linux 4.2-rc7

Backmerge master for i915 fixes

4 files changed, 37 insertions, 18 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 922c5e0cea4c..cb9e5df42dd2 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1410,7 +1410,7 @@ void cpu_init(void)
         load_sp0(t, &current->thread);
         set_tss_desc(cpu, t);
         load_TR_desc();
-        load_LDT(&init_mm.context);
+        load_mm_ldt(&init_mm);
 
         clear_all_debug_regs();
         dbg_restore_debug_regs();
@@ -1459,7 +1459,7 @@ void cpu_init(void)
         load_sp0(t, thread);
         set_tss_desc(cpu, t);
         load_TR_desc();
-        load_LDT(&init_mm.context);
+        load_mm_ldt(&init_mm);
 
         t->x86_tss.io_bitmap_base = offsetof(struct tss_struct, io_bitmap);
 
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 3658de47900f..9469dfa55607 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -2179,21 +2179,25 @@ static unsigned long get_segment_base(unsigned int segment)
         int idx = segment >> 3;
 
         if ((segment & SEGMENT_TI_MASK) == SEGMENT_LDT) {
+                struct ldt_struct *ldt;
+
                 if (idx > LDT_ENTRIES)
                         return 0;
 
-                if (idx > current->active_mm->context.size)
+                /* IRQs are off, so this synchronizes with smp_store_release */
+                ldt = lockless_dereference(current->active_mm->context.ldt);
+                if (!ldt || idx > ldt->size)
                         return 0;
 
-                desc = current->active_mm->context.ldt;
+                desc = &ldt->entries[idx];
         } else {
                 if (idx > GDT_ENTRIES)
                         return 0;
 
-                desc = raw_cpu_ptr(gdt_page.gdt);
+                desc = raw_cpu_ptr(gdt_page.gdt) + idx;
         }
 
-        return get_desc_base(desc + idx);
+        return get_desc_base(desc);
 }
 
 #ifdef CONFIG_COMPAT
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index b9826a981fb2..6326ae24e4d5 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -2534,7 +2534,7 @@ static int intel_pmu_cpu_prepare(int cpu)
         if (x86_pmu.extra_regs || x86_pmu.lbr_sel_map) {
                 cpuc->shared_regs = allocate_shared_regs(cpu);
                 if (!cpuc->shared_regs)
-                        return NOTIFY_BAD;
+                        goto err;
         }
 
         if (x86_pmu.flags & PMU_FL_EXCL_CNTRS) {
@@ -2542,18 +2542,27 @@ static int intel_pmu_cpu_prepare(int cpu)
 
                 cpuc->constraint_list = kzalloc(sz, GFP_KERNEL);
                 if (!cpuc->constraint_list)
-                        return NOTIFY_BAD;
+                        goto err_shared_regs;
 
                 cpuc->excl_cntrs = allocate_excl_cntrs(cpu);
-                if (!cpuc->excl_cntrs) {
-                        kfree(cpuc->constraint_list);
-                        kfree(cpuc->shared_regs);
-                        return NOTIFY_BAD;
-                }
+                if (!cpuc->excl_cntrs)
+                        goto err_constraint_list;
+
                 cpuc->excl_thread_id = 0;
         }
 
         return NOTIFY_OK;
+
+err_constraint_list:
+        kfree(cpuc->constraint_list);
+        cpuc->constraint_list = NULL;
+
+err_shared_regs:
+        kfree(cpuc->shared_regs);
+        cpuc->shared_regs = NULL;
+
+err:
+        return NOTIFY_BAD;
 }
 
 static void intel_pmu_cpu_starting(int cpu)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_cqm.c b/arch/x86/kernel/cpu/perf_event_intel_cqm.c
index 188076161c1b..377e8f8ed391 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_cqm.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_cqm.c
@@ -952,6 +952,14 @@ static u64 intel_cqm_event_count(struct perf_event *event)
                 return 0;
 
         /*
+         * Getting up-to-date values requires an SMP IPI which is not
+         * possible if we're being called in interrupt context. Return
+         * the cached values instead.
+         */
+        if (unlikely(in_interrupt()))
+                goto out;
+
+        /*
          * Notice that we don't perform the reading of an RMID
          * atomically, because we can't hold a spin lock across the
          * IPIs.
@@ -1247,7 +1255,7 @@ static inline void cqm_pick_event_reader(int cpu)
         cpumask_set_cpu(cpu, &cqm_cpumask);
 }
 
-static void intel_cqm_cpu_prepare(unsigned int cpu)
+static void intel_cqm_cpu_starting(unsigned int cpu)
 {
         struct intel_pqr_state *state = &per_cpu(pqr_state, cpu);
         struct cpuinfo_x86 *c = &cpu_data(cpu);
@@ -1288,13 +1296,11 @@ static int intel_cqm_cpu_notifier(struct notifier_block *nb,
         unsigned int cpu  = (unsigned long)hcpu;
 
         switch (action & ~CPU_TASKS_FROZEN) {
-        case CPU_UP_PREPARE:
-                intel_cqm_cpu_prepare(cpu);
-                break;
         case CPU_DOWN_PREPARE:
                 intel_cqm_cpu_exit(cpu);
                 break;
         case CPU_STARTING:
+                intel_cqm_cpu_starting(cpu);
                 cqm_pick_event_reader(cpu);
                 break;
         }
@@ -1365,7 +1371,7 @@ static int __init intel_cqm_init(void)
                 goto out;
 
         for_each_online_cpu(i) {
-                intel_cqm_cpu_prepare(i);
+                intel_cqm_cpu_starting(i);
                 cqm_pick_event_reader(i);
         }