[PATCH 7/7] perf, tracing: add missing __percpu markups

From: Frederic Weisbecker
Date: Wed Aug 18 2010 - 19:46:45 EST


From: Namhyung Kim <namhyung@xxxxxxxxx>

ftrace_event_call->perf_events, perf_trace_buf,
fgraph_data->cpu_data and some local variables are percpu pointers
missing __percpu markups. Add them.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
LKML-Reference: <1281498479-28551-1-git-send-email-namhyung@xxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
include/linux/ftrace_event.h | 4 ++--
kernel/trace/trace_event_perf.c | 15 ++++++++-------
kernel/trace/trace_functions_graph.c | 2 +-
3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 02b8b24..5f8ad7b 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -191,8 +191,8 @@ struct ftrace_event_call {
unsigned int flags;

#ifdef CONFIG_PERF_EVENTS
- int perf_refcount;
- struct hlist_head *perf_events;
+ int perf_refcount;
+ struct hlist_head __percpu *perf_events;
#endif
};

diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index db2eae2..92f5477 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -9,7 +9,7 @@
#include <linux/kprobes.h>
#include "trace.h"

-static char *perf_trace_buf[PERF_NR_CONTEXTS];
+static char __percpu *perf_trace_buf[PERF_NR_CONTEXTS];

/*
* Force it to be aligned to unsigned long to avoid misaligned accesses
@@ -24,7 +24,7 @@ static int total_ref_count;
static int perf_trace_event_init(struct ftrace_event_call *tp_event,
struct perf_event *p_event)
{
- struct hlist_head *list;
+ struct hlist_head __percpu *list;
int ret = -ENOMEM;
int cpu;

@@ -42,11 +42,11 @@ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
tp_event->perf_events = list;

if (!total_ref_count) {
- char *buf;
+ char __percpu *buf;
int i;

for (i = 0; i < PERF_NR_CONTEXTS; i++) {
- buf = (char *)alloc_percpu(perf_trace_t);
+ buf = (char __percpu *)alloc_percpu(perf_trace_t);
if (!buf)
goto fail;

@@ -102,13 +102,14 @@ int perf_trace_init(struct perf_event *p_event)
int perf_trace_enable(struct perf_event *p_event)
{
struct ftrace_event_call *tp_event = p_event->tp_event;
+ struct hlist_head __percpu *pcpu_list;
struct hlist_head *list;

- list = tp_event->perf_events;
- if (WARN_ON_ONCE(!list))
+ pcpu_list = tp_event->perf_events;
+ if (WARN_ON_ONCE(!pcpu_list))
return -EINVAL;

- list = this_cpu_ptr(list);
+ list = this_cpu_ptr(pcpu_list);
hlist_add_head_rcu(&p_event->hlist_entry, list);

return 0;
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 6bff236..fcb5a54 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -23,7 +23,7 @@ struct fgraph_cpu_data {
};

struct fgraph_data {
- struct fgraph_cpu_data *cpu_data;
+ struct fgraph_cpu_data __percpu *cpu_data;

/* Place to preserve last processed entry. */
struct ftrace_graph_ent_entry ent;
--
1.6.2.3

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