[GIT PULL] perf fixes

From: Ingo Molnar
Date: Mon Dec 05 2011 - 14:15:35 EST


Linus,

Please pull the latest perf-urgent-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-for-linus

Thanks,

Ingo

------------------>
Arnaldo Carvalho de Melo (1):
perf python: Fix undefined symbol problem

David Ahern (1):
perf session: Fix crash with invalid CPU list

Gleb Natapov (1):
perf: Do not set task_ctx pointer in cpuctx if there are no events in the context

Peter Zijlstra (5):
perf/x86: Fix PEBS instruction unwind
perf: Don't use -ENOSPC for out of PMU resources
perf/x86: Enable raw event access to Intel offcore events
perf, x86: Disable PEBS on SandyBridge chips
perf: Fix loss of notification with multi-event

Robert Richter (3):
oprofile: Fix crash when unloading module (hr timer mode)
oprofile, x86: Fix crash when unloading module (nmi timer mode)
perf, x86: Force IBS LVT offset assignment for family 10h

Tejun Heo (1):
trace_events_filter: Use rcu_assign_pointer() when setting ftrace_event_call->filter


arch/arm/kernel/perf_event.c | 6 +-
arch/mips/kernel/perf_event_mipsxx.c | 8 +-
arch/x86/kernel/cpu/perf_event.c | 16 ++---
arch/x86/kernel/cpu/perf_event_amd_ibs.c | 29 ++++++----
arch/x86/kernel/cpu/perf_event_intel.c | 8 +++
arch/x86/kernel/cpu/perf_event_intel_ds.c | 6 ++-
arch/x86/kernel/cpu/perf_event_p4.c | 2 +-
arch/x86/oprofile/init.c | 7 ++-
drivers/oprofile/oprof.c | 29 ++++++++--
drivers/oprofile/timer_int.c | 1 +
include/linux/perf_event.h | 1 +
kernel/events/core.c | 89 ++++++++++++++++++++++++++++-
kernel/events/internal.h | 3 +
kernel/events/ring_buffer.c | 3 +
kernel/trace/trace_events_filter.c | 6 +-
tools/perf/util/evsel.c | 10 +++
tools/perf/util/hist.c | 10 ---
tools/perf/util/hist.h | 2 -
tools/perf/util/session.c | 4 +
19 files changed, 185 insertions(+), 55 deletions(-)

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 24e2347..ff17b17 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -347,15 +347,15 @@ validate_group(struct perf_event *event)
memset(&fake_pmu, 0, sizeof(fake_pmu));

if (!validate_event(&fake_pmu, leader))
- return -ENOSPC;
+ return -EINVAL;

list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
if (!validate_event(&fake_pmu, sibling))
- return -ENOSPC;
+ return -EINVAL;
}

if (!validate_event(&fake_pmu, event))
- return -ENOSPC;
+ return -EINVAL;

return 0;
}
diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
index 4f2971b..315fc0b 100644
--- a/arch/mips/kernel/perf_event_mipsxx.c
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -623,7 +623,7 @@ static int mipspmu_event_init(struct perf_event *event)
if (!atomic_inc_not_zero(&active_events)) {
if (atomic_read(&active_events) > MIPS_MAX_HWEVENTS) {
atomic_dec(&active_events);
- return -ENOSPC;
+ return -EINVAL;
}

mutex_lock(&pmu_reserve_mutex);
@@ -732,15 +732,15 @@ static int validate_group(struct perf_event *event)
memset(&fake_cpuc, 0, sizeof(fake_cpuc));

if (!validate_event(&fake_cpuc, leader))
- return -ENOSPC;
+ return -EINVAL;

list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
if (!validate_event(&fake_cpuc, sibling))
- return -ENOSPC;
+ return -EINVAL;
}

if (!validate_event(&fake_cpuc, event))
- return -ENOSPC;
+ return -EINVAL;

return 0;
}
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 6408910..2bda212 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -312,12 +312,8 @@ int x86_setup_perfctr(struct perf_event *event)
return -EOPNOTSUPP;
}

- /*
- * Do not allow config1 (extended registers) to propagate,
- * there's no sane user-space generalization yet:
- */
if (attr->type == PERF_TYPE_RAW)
- return 0;
+ return x86_pmu_extra_regs(event->attr.config, event);

if (attr->type == PERF_TYPE_HW_CACHE)
return set_ext_hw_attr(hwc, event);
@@ -588,7 +584,7 @@ done:
x86_pmu.put_event_constraints(cpuc, cpuc->event_list[i]);
}
}
- return num ? -ENOSPC : 0;
+ return num ? -EINVAL : 0;
}

/*
@@ -607,7 +603,7 @@ static int collect_events(struct cpu_hw_events *cpuc, struct perf_event *leader,

if (is_x86_event(leader)) {
if (n >= max_count)
- return -ENOSPC;
+ return -EINVAL;
cpuc->event_list[n] = leader;
n++;
}
@@ -620,7 +616,7 @@ static int collect_events(struct cpu_hw_events *cpuc, struct perf_event *leader,
continue;

if (n >= max_count)
- return -ENOSPC;
+ return -EINVAL;

cpuc->event_list[n] = event;
n++;
@@ -1316,7 +1312,7 @@ static int validate_event(struct perf_event *event)
c = x86_pmu.get_event_constraints(fake_cpuc, event);

if (!c || !c->weight)
- ret = -ENOSPC;
+ ret = -EINVAL;

if (x86_pmu.put_event_constraints)
x86_pmu.put_event_constraints(fake_cpuc, event);
@@ -1341,7 +1337,7 @@ static int validate_group(struct perf_event *event)
{
struct perf_event *leader = event->group_leader;
struct cpu_hw_events *fake_cpuc;
- int ret = -ENOSPC, n;
+ int ret = -EINVAL, n;

fake_cpuc = allocate_fake_cpuc();
if (IS_ERR(fake_cpuc))
diff --git a/arch/x86/kernel/cpu/perf_event_amd_ibs.c b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
index ab6343d..3b8a2d3 100644
--- a/arch/x86/kernel/cpu/perf_event_amd_ibs.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
@@ -199,8 +199,7 @@ static int force_ibs_eilvt_setup(void)
goto out;
}

- pr_err(FW_BUG "using offset %d for IBS interrupts\n", offset);
- pr_err(FW_BUG "workaround enabled for IBS LVT offset\n");
+ pr_info("IBS: LVT offset %d assigned\n", offset);

return 0;
out:
@@ -265,19 +264,23 @@ perf_ibs_cpu_notifier(struct notifier_block *self, unsigned long action, void *h
static __init int amd_ibs_init(void)
{
u32 caps;
- int ret;
+ int ret = -EINVAL;

caps = __get_ibs_caps();
if (!caps)
return -ENODEV; /* ibs not supported by the cpu */

- if (!ibs_eilvt_valid()) {
- ret = force_ibs_eilvt_setup();
- if (ret) {
- pr_err("Failed to setup IBS, %d\n", ret);
- return ret;
- }
- }
+ /*
+ * Force LVT offset assignment for family 10h: The offsets are
+ * not assigned by the BIOS for this family, so the OS is
+ * responsible for doing it. If the OS assignment fails, fall
+ * back to BIOS settings and try to setup this.
+ */
+ if (boot_cpu_data.x86 == 0x10)
+ force_ibs_eilvt_setup();
+
+ if (!ibs_eilvt_valid())
+ goto out;

get_online_cpus();
ibs_caps = caps;
@@ -287,7 +290,11 @@ static __init int amd_ibs_init(void)
smp_call_function(setup_APIC_ibs, NULL, 1);
put_online_cpus();

- return perf_event_ibs_init();
+ ret = perf_event_ibs_init();
+out:
+ if (ret)
+ pr_err("Failed to setup IBS, %d\n", ret);
+ return ret;
}

/* Since we need the pci subsystem to init ibs we can't do this earlier: */
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 2be5ebe..8d601b1 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1545,6 +1545,13 @@ static void intel_clovertown_quirks(void)
x86_pmu.pebs_constraints = NULL;
}

+static void intel_sandybridge_quirks(void)
+{
+ printk(KERN_WARNING "PEBS disabled due to CPU errata.\n");
+ x86_pmu.pebs = 0;
+ x86_pmu.pebs_constraints = NULL;
+}
+
__init int intel_pmu_init(void)
{
union cpuid10_edx edx;
@@ -1694,6 +1701,7 @@ __init int intel_pmu_init(void)
break;

case 42: /* SandyBridge */
+ x86_pmu.quirks = intel_sandybridge_quirks;
case 45: /* SandyBridge, "Romely-EP" */
memcpy(hw_cache_event_ids, snb_hw_cache_event_ids,
sizeof(hw_cache_event_ids));
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index c0d238f..73da6b6 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -493,6 +493,7 @@ static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs)
unsigned long from = cpuc->lbr_entries[0].from;
unsigned long old_to, to = cpuc->lbr_entries[0].to;
unsigned long ip = regs->ip;
+ int is_64bit = 0;

/*
* We don't need to fixup if the PEBS assist is fault like
@@ -544,7 +545,10 @@ static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs)
} else
kaddr = (void *)to;

- kernel_insn_init(&insn, kaddr);
+#ifdef CONFIG_X86_64
+ is_64bit = kernel_ip(to) || !test_thread_flag(TIF_IA32);
+#endif
+ insn_init(&insn, kaddr, is_64bit);
insn_get_length(&insn);
to += insn.length;
} while (to < ip);
diff --git a/arch/x86/kernel/cpu/perf_event_p4.c b/arch/x86/kernel/cpu/perf_event_p4.c
index 492bf13..ef484d9 100644
--- a/arch/x86/kernel/cpu/perf_event_p4.c
+++ b/arch/x86/kernel/cpu/perf_event_p4.c
@@ -1268,7 +1268,7 @@ reserve:
}

done:
- return num ? -ENOSPC : 0;
+ return num ? -EINVAL : 0;
}

static __initconst const struct x86_pmu p4_pmu = {
diff --git a/arch/x86/oprofile/init.c b/arch/x86/oprofile/init.c
index cdfe4c5..f148cf6 100644
--- a/arch/x86/oprofile/init.c
+++ b/arch/x86/oprofile/init.c
@@ -21,6 +21,7 @@ extern int op_nmi_timer_init(struct oprofile_operations *ops);
extern void op_nmi_exit(void);
extern void x86_backtrace(struct pt_regs * const regs, unsigned int depth);

+static int nmi_timer;

int __init oprofile_arch_init(struct oprofile_operations *ops)
{
@@ -31,8 +32,9 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
#ifdef CONFIG_X86_LOCAL_APIC
ret = op_nmi_init(ops);
#endif
+ nmi_timer = (ret != 0);
#ifdef CONFIG_X86_IO_APIC
- if (ret < 0)
+ if (nmi_timer)
ret = op_nmi_timer_init(ops);
#endif
ops->backtrace = x86_backtrace;
@@ -44,6 +46,7 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
void oprofile_arch_exit(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
- op_nmi_exit();
+ if (!nmi_timer)
+ op_nmi_exit();
#endif
}
diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
index dccd863..f8c752e 100644
--- a/drivers/oprofile/oprof.c
+++ b/drivers/oprofile/oprof.c
@@ -239,26 +239,45 @@ int oprofile_set_ulong(unsigned long *addr, unsigned long val)
return err;
}

+static int timer_mode;
+
static int __init oprofile_init(void)
{
int err;

+ /* always init architecture to setup backtrace support */
err = oprofile_arch_init(&oprofile_ops);
- if (err < 0 || timer) {
- printk(KERN_INFO "oprofile: using timer interrupt.\n");
+
+ timer_mode = err || timer; /* fall back to timer mode on errors */
+ if (timer_mode) {
+ if (!err)
+ oprofile_arch_exit();
err = oprofile_timer_init(&oprofile_ops);
if (err)
return err;
}
- return oprofilefs_register();
+
+ err = oprofilefs_register();
+ if (!err)
+ return 0;
+
+ /* failed */
+ if (timer_mode)
+ oprofile_timer_exit();
+ else
+ oprofile_arch_exit();
+
+ return err;
}


static void __exit oprofile_exit(void)
{
- oprofile_timer_exit();
oprofilefs_unregister();
- oprofile_arch_exit();
+ if (timer_mode)
+ oprofile_timer_exit();
+ else
+ oprofile_arch_exit();
}


diff --git a/drivers/oprofile/timer_int.c b/drivers/oprofile/timer_int.c
index 3ef4462..878fba1 100644
--- a/drivers/oprofile/timer_int.c
+++ b/drivers/oprofile/timer_int.c
@@ -110,6 +110,7 @@ int oprofile_timer_init(struct oprofile_operations *ops)
ops->start = oprofile_hrtimer_start;
ops->stop = oprofile_hrtimer_stop;
ops->cpu_type = "timer";
+ printk(KERN_INFO "oprofile: using timer interrupt.\n");
return 0;
}

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 1e9ebe5..b1f8912 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -822,6 +822,7 @@ struct perf_event {
int mmap_locked;
struct user_struct *mmap_user;
struct ring_buffer *rb;
+ struct list_head rb_entry;

/* poll related */
wait_queue_head_t waitq;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 0e8457d..600c162 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -185,6 +185,9 @@ static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
static void update_context_time(struct perf_event_context *ctx);
static u64 perf_event_time(struct perf_event *event);

+static void ring_buffer_attach(struct perf_event *event,
+ struct ring_buffer *rb);
+
void __weak perf_event_print_debug(void) { }

extern __weak const char *perf_pmu_name(void)
@@ -2173,7 +2176,8 @@ static void perf_event_context_sched_in(struct perf_event_context *ctx,

perf_event_sched_in(cpuctx, ctx, task);

- cpuctx->task_ctx = ctx;
+ if (ctx->nr_events)
+ cpuctx->task_ctx = ctx;

perf_pmu_enable(ctx->pmu);
perf_ctx_unlock(cpuctx, ctx);
@@ -3190,12 +3194,33 @@ static unsigned int perf_poll(struct file *file, poll_table *wait)
struct ring_buffer *rb;
unsigned int events = POLL_HUP;

+ /*
+ * Race between perf_event_set_output() and perf_poll(): perf_poll()
+ * grabs the rb reference but perf_event_set_output() overrides it.
+ * Here is the timeline for two threads T1, T2:
+ * t0: T1, rb = rcu_dereference(event->rb)
+ * t1: T2, old_rb = event->rb
+ * t2: T2, event->rb = new rb
+ * t3: T2, ring_buffer_detach(old_rb)
+ * t4: T1, ring_buffer_attach(rb1)
+ * t5: T1, poll_wait(event->waitq)
+ *
+ * To avoid this problem, we grab mmap_mutex in perf_poll()
+ * thereby ensuring that the assignment of the new ring buffer
+ * and the detachment of the old buffer appear atomic to perf_poll()
+ */
+ mutex_lock(&event->mmap_mutex);
+
rcu_read_lock();
rb = rcu_dereference(event->rb);
- if (rb)
+ if (rb) {
+ ring_buffer_attach(event, rb);
events = atomic_xchg(&rb->poll, 0);
+ }
rcu_read_unlock();

+ mutex_unlock(&event->mmap_mutex);
+
poll_wait(file, &event->waitq, wait);

return events;
@@ -3496,6 +3521,49 @@ unlock:
return ret;
}

+static void ring_buffer_attach(struct perf_event *event,
+ struct ring_buffer *rb)
+{
+ unsigned long flags;
+
+ if (!list_empty(&event->rb_entry))
+ return;
+
+ spin_lock_irqsave(&rb->event_lock, flags);
+ if (!list_empty(&event->rb_entry))
+ goto unlock;
+
+ list_add(&event->rb_entry, &rb->event_list);
+unlock:
+ spin_unlock_irqrestore(&rb->event_lock, flags);
+}
+
+static void ring_buffer_detach(struct perf_event *event,
+ struct ring_buffer *rb)
+{
+ unsigned long flags;
+
+ if (list_empty(&event->rb_entry))
+ return;
+
+ spin_lock_irqsave(&rb->event_lock, flags);
+ list_del_init(&event->rb_entry);
+ wake_up_all(&event->waitq);
+ spin_unlock_irqrestore(&rb->event_lock, flags);
+}
+
+static void ring_buffer_wakeup(struct perf_event *event)
+{
+ struct ring_buffer *rb;
+
+ rcu_read_lock();
+ rb = rcu_dereference(event->rb);
+ list_for_each_entry_rcu(event, &rb->event_list, rb_entry) {
+ wake_up_all(&event->waitq);
+ }
+ rcu_read_unlock();
+}
+
static void rb_free_rcu(struct rcu_head *rcu_head)
{
struct ring_buffer *rb;
@@ -3521,9 +3589,19 @@ static struct ring_buffer *ring_buffer_get(struct perf_event *event)

static void ring_buffer_put(struct ring_buffer *rb)
{
+ struct perf_event *event, *n;
+ unsigned long flags;
+
if (!atomic_dec_and_test(&rb->refcount))
return;

+ spin_lock_irqsave(&rb->event_lock, flags);
+ list_for_each_entry_safe(event, n, &rb->event_list, rb_entry) {
+ list_del_init(&event->rb_entry);
+ wake_up_all(&event->waitq);
+ }
+ spin_unlock_irqrestore(&rb->event_lock, flags);
+
call_rcu(&rb->rcu_head, rb_free_rcu);
}

@@ -3546,6 +3624,7 @@ static void perf_mmap_close(struct vm_area_struct *vma)
atomic_long_sub((size >> PAGE_SHIFT) + 1, &user->locked_vm);
vma->vm_mm->pinned_vm -= event->mmap_locked;
rcu_assign_pointer(event->rb, NULL);
+ ring_buffer_detach(event, rb);
mutex_unlock(&event->mmap_mutex);

ring_buffer_put(rb);
@@ -3700,7 +3779,7 @@ static const struct file_operations perf_fops = {

void perf_event_wakeup(struct perf_event *event)
{
- wake_up_all(&event->waitq);
+ ring_buffer_wakeup(event);

if (event->pending_kill) {
kill_fasync(&event->fasync, SIGIO, event->pending_kill);
@@ -5822,6 +5901,8 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
INIT_LIST_HEAD(&event->group_entry);
INIT_LIST_HEAD(&event->event_entry);
INIT_LIST_HEAD(&event->sibling_list);
+ INIT_LIST_HEAD(&event->rb_entry);
+
init_waitqueue_head(&event->waitq);
init_irq_work(&event->pending, perf_pending_event);

@@ -6028,6 +6109,8 @@ set:

old_rb = event->rb;
rcu_assign_pointer(event->rb, rb);
+ if (old_rb)
+ ring_buffer_detach(event, old_rb);
ret = 0;
unlock:
mutex_unlock(&event->mmap_mutex);
diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index 09097dd..64568a6 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -22,6 +22,9 @@ struct ring_buffer {
local_t lost; /* nr records lost */

long watermark; /* wakeup watermark */
+ /* poll crap */
+ spinlock_t event_lock;
+ struct list_head event_list;

struct perf_event_mmap_page *user_page;
void *data_pages[0];
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index a2a2920..7f3011c 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -209,6 +209,9 @@ ring_buffer_init(struct ring_buffer *rb, long watermark, int flags)
rb->writable = 1;

atomic_set(&rb->refcount, 1);
+
+ INIT_LIST_HEAD(&rb->event_list);
+ spin_lock_init(&rb->event_lock);
}

#ifndef CONFIG_PERF_USE_VMALLOC
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 816d3d0..d6e7926 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1686,7 +1686,7 @@ static int replace_system_preds(struct event_subsystem *system,
* replace the filter for the call.
*/
filter = call->filter;
- call->filter = filter_item->filter;
+ rcu_assign_pointer(call->filter, filter_item->filter);
filter_item->filter = filter;

fail = false;
@@ -1741,7 +1741,7 @@ int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
filter = call->filter;
if (!filter)
goto out_unlock;
- call->filter = NULL;
+ RCU_INIT_POINTER(call->filter, NULL);
/* Make sure the filter is not being used */
synchronize_sched();
__free_filter(filter);
@@ -1782,7 +1782,7 @@ out:
* string
*/
tmp = call->filter;
- call->filter = filter;
+ rcu_assign_pointer(call->filter, filter);
if (tmp) {
/* Make sure the call is done with the filter */
synchronize_sched();
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index e426264..d7915d4 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -34,6 +34,16 @@ int __perf_evsel__sample_size(u64 sample_type)
return size;
}

+static void hists__init(struct hists *hists)
+{
+ memset(hists, 0, sizeof(*hists));
+ hists->entries_in_array[0] = hists->entries_in_array[1] = RB_ROOT;
+ hists->entries_in = &hists->entries_in_array[0];
+ hists->entries_collapsed = RB_ROOT;
+ hists->entries = RB_ROOT;
+ pthread_mutex_init(&hists->lock, NULL);
+}
+
void perf_evsel__init(struct perf_evsel *evsel,
struct perf_event_attr *attr, int idx)
{
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index a36a3fa..abef270 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1211,13 +1211,3 @@ size_t hists__fprintf_nr_events(struct hists *hists, FILE *fp)

return ret;
}
-
-void hists__init(struct hists *hists)
-{
- memset(hists, 0, sizeof(*hists));
- hists->entries_in_array[0] = hists->entries_in_array[1] = RB_ROOT;
- hists->entries_in = &hists->entries_in_array[0];
- hists->entries_collapsed = RB_ROOT;
- hists->entries = RB_ROOT;
- pthread_mutex_init(&hists->lock, NULL);
-}
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index c86c1d2..89289c8 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -63,8 +63,6 @@ struct hists {
struct callchain_cursor callchain_cursor;
};

-void hists__init(struct hists *hists);
-
struct hist_entry *__hists__add_entry(struct hists *self,
struct addr_location *al,
struct symbol *parent, u64 period);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 85c1e6b7..0f4555c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1333,6 +1333,10 @@ int perf_session__cpu_bitmap(struct perf_session *session,
}

map = cpu_map__new(cpu_list);
+ if (map == NULL) {
+ pr_err("Invalid cpu_list\n");
+ return -1;
+ }

for (i = 0; i < map->nr; i++) {
int cpu = map->map[i];
--
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