Commit e321ae4c authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Ingo Molnar:
 "Misc kernel and tooling fixes"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  tools lib traceevent: Fix conversion of pointer to integer of different size
  perf/trace: Properly use u64 to hold event_id
  perf: Remove fragile swevent hlist optimization
  ftrace, perf: Avoid infinite event generation loop
  tools lib traceevent: Fix use of multiple options in processing field
  perf header: Fix possible memory leaks in process_group_desc()
  perf header: Fix bogus group name
  perf tools: Tag thread comm as overriden
parents bcc2f9b7 e98a6e59
......@@ -71,6 +71,17 @@ DEFINE_IRQ_VECTOR_EVENT(x86_platform_ipi);
*/
DEFINE_IRQ_VECTOR_EVENT(irq_work);
/*
* We must dis-allow sampling irq_work_exit() because perf event sampling
* itself can cause irq_work, which would lead to an infinite loop;
*
* 1) irq_work_exit happens
* 2) generates perf sample
* 3) generates irq_work
* 4) goto 1
*/
TRACE_EVENT_PERF_PERM(irq_work_exit, is_sampling_event(p_event) ? -EPERM : 0);
/*
* call_function - called when entering/exiting a call function interrupt
* vector handler
......
......@@ -248,6 +248,9 @@ struct ftrace_event_call {
#ifdef CONFIG_PERF_EVENTS
int perf_refcount;
struct hlist_head __percpu *perf_events;
int (*perf_perm)(struct ftrace_event_call *,
struct perf_event *);
#endif
};
......@@ -317,6 +320,19 @@ struct ftrace_event_file {
} \
early_initcall(trace_init_flags_##name);
#define __TRACE_EVENT_PERF_PERM(name, expr...) \
static int perf_perm_##name(struct ftrace_event_call *tp_event, \
struct perf_event *p_event) \
{ \
return ({ expr; }); \
} \
static int __init trace_init_perf_perm_##name(void) \
{ \
event_##name.perf_perm = &perf_perm_##name; \
return 0; \
} \
early_initcall(trace_init_perf_perm_##name);
#define PERF_MAX_TRACE_SIZE 2048
#define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
......
......@@ -267,6 +267,8 @@ static inline void tracepoint_synchronize_unregister(void)
#define TRACE_EVENT_FLAGS(event, flag)
#define TRACE_EVENT_PERF_PERM(event, expr...)
#endif /* DECLARE_TRACE */
#ifndef TRACE_EVENT
......@@ -399,4 +401,6 @@ static inline void tracepoint_synchronize_unregister(void)
#define TRACE_EVENT_FLAGS(event, flag)
#define TRACE_EVENT_PERF_PERM(event, expr...)
#endif /* ifdef TRACE_EVENT (see note above) */
......@@ -90,6 +90,10 @@
#define TRACE_EVENT_FLAGS(name, value) \
__TRACE_EVENT_FLAGS(name, value)
#undef TRACE_EVENT_PERF_PERM
#define TRACE_EVENT_PERF_PERM(name, expr...) \
__TRACE_EVENT_PERF_PERM(name, expr)
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
......@@ -140,6 +144,9 @@
#undef TRACE_EVENT_FLAGS
#define TRACE_EVENT_FLAGS(event, flag)
#undef TRACE_EVENT_PERF_PERM
#define TRACE_EVENT_PERF_PERM(event, expr...)
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
/*
......
......@@ -5680,11 +5680,6 @@ static void swevent_hlist_put(struct perf_event *event)
{
int cpu;
if (event->cpu != -1) {
swevent_hlist_put_cpu(event, event->cpu);
return;
}
for_each_possible_cpu(cpu)
swevent_hlist_put_cpu(event, cpu);
}
......@@ -5718,9 +5713,6 @@ static int swevent_hlist_get(struct perf_event *event)
int err;
int cpu, failed_cpu;
if (event->cpu != -1)
return swevent_hlist_get_cpu(event, event->cpu);
get_online_cpus();
for_each_possible_cpu(cpu) {
err = swevent_hlist_get_cpu(event, cpu);
......
......@@ -24,6 +24,12 @@ static int total_ref_count;
static int perf_trace_event_perm(struct ftrace_event_call *tp_event,
struct perf_event *p_event)
{
if (tp_event->perf_perm) {
int ret = tp_event->perf_perm(tp_event, p_event);
if (ret)
return ret;
}
/* The ftrace function trace is allowed only for root. */
if (ftrace_event_is_function(tp_event) &&
perf_paranoid_tracepoint_raw() && !capable(CAP_SYS_ADMIN))
......@@ -173,7 +179,7 @@ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
int perf_trace_init(struct perf_event *p_event)
{
struct ftrace_event_call *tp_event;
int event_id = p_event->attr.config;
u64 event_id = p_event->attr.config;
int ret = -EINVAL;
mutex_lock(&event_mutex);
......
......@@ -1606,6 +1606,24 @@ process_arg(struct event_format *event, struct print_arg *arg, char **tok)
static enum event_type
process_op(struct event_format *event, struct print_arg *arg, char **tok);
/*
* For __print_symbolic() and __print_flags, we need to completely
* evaluate the first argument, which defines what to print next.
*/
static enum event_type
process_field_arg(struct event_format *event, struct print_arg *arg, char **tok)
{
enum event_type type;
type = process_arg(event, arg, tok);
while (type == EVENT_OP) {
type = process_op(event, arg, tok);
}
return type;
}
static enum event_type
process_cond(struct event_format *event, struct print_arg *top, char **tok)
{
......@@ -2371,7 +2389,7 @@ process_flags(struct event_format *event, struct print_arg *arg, char **tok)
goto out_free;
}
type = process_arg(event, field, &token);
type = process_field_arg(event, field, &token);
/* Handle operations in the first argument */
while (type == EVENT_OP)
......@@ -2424,7 +2442,8 @@ process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
goto out_free;
}
type = process_arg(event, field, &token);
type = process_field_arg(event, field, &token);
if (test_type_token(type, token, EVENT_DELIM, ","))
goto out_free_field;
......@@ -3446,7 +3465,7 @@ eval_num_arg(void *data, int size, struct event_format *event, struct print_arg
* is in the bottom half of the 32 bit field.
*/
offset &= 0xffff;
val = (unsigned long long)(data + offset);
val = (unsigned long long)((unsigned long)data + offset);
break;
default: /* not sure what to do there */
return 0;
......
......@@ -2078,8 +2078,10 @@ static int process_group_desc(struct perf_file_section *section __maybe_unused,
if (evsel->idx == (int) desc[i].leader_idx) {
evsel->leader = evsel;
/* {anon_group} is a dummy name */
if (strcmp(desc[i].name, "{anon_group}"))
if (strcmp(desc[i].name, "{anon_group}")) {
evsel->group_name = desc[i].name;
desc[i].name = NULL;
}
evsel->nr_members = desc[i].nr_members;
if (i >= nr_groups || nr > 0) {
......@@ -2105,7 +2107,7 @@ static int process_group_desc(struct perf_file_section *section __maybe_unused,
ret = 0;
out_free:
while ((int) --i >= 0)
for (i = 0; i < nr_groups; i++)
free(desc[i].name);
free(desc);
......
......@@ -70,14 +70,13 @@ int thread__set_comm(struct thread *thread, const char *str, u64 timestamp)
/* Override latest entry if it had no specific time coverage */
if (!curr->start) {
comm__override(curr, str, timestamp);
return 0;
}
} else {
new = comm__new(str, timestamp);
if (!new)
return -ENOMEM;
list_add(&new->list, &thread->comm_list);
}
thread->comm_set = true;
return 0;
......
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