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Date: Wed, 17 Feb 2010 11:16:09 +0900
From: Tejun Heo <tj@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
Frederic Weisbecker <fweisbec@...il.com>
CC: Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [PATCH perf/core] percpu: add __percpu sparse annotations to trace
Add __percpu sparse annotations to trace.
These annotations are to make sparse consider percpu variables to be
in a different address space and warn if accessed without going
through percpu accessors. This patch doesn't affect normal builds.
Signed-off-by: Tejun Heo <tj@...nel.org>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
---
Trace part of __percpu sparce patches. This patch needs the following
commit from mainline to define __percpu.
2938429501b73f6aeb312236eac7ed0416a07cd5
Thanks.
include/trace/ftrace.h | 2 +-
kernel/trace/trace_event_profile.c | 15 ++++++++-------
kernel/trace/trace_functions_graph.c | 2 +-
kernel/trace/trace_ksym.c | 10 +++++-----
4 files changed, 15 insertions(+), 14 deletions(-)
Index: linux-2.6-tip/include/trace/ftrace.h
===================================================================
--- linux-2.6-tip.orig/include/trace/ftrace.h
+++ linux-2.6-tip/include/trace/ftrace.h
@@ -773,7 +773,7 @@ __attribute__((section("_ftrace_events")
* struct ftrace_event_call *event_call = &event_<call>;
* extern void perf_tp_event(int, u64, u64, void *, int);
* struct ftrace_raw_##call *entry;
- * struct perf_trace_buf *trace_buf;
+ * struct perf_trace_buf __percpu *trace_buf;
* u64 __addr = 0, __count = 1;
* unsigned long irq_flags;
* struct trace_entry *ent;
Index: linux-2.6-tip/kernel/trace/trace_event_profile.c
===================================================================
--- linux-2.6-tip.orig/kernel/trace/trace_event_profile.c
+++ linux-2.6-tip/kernel/trace/trace_event_profile.c
@@ -10,8 +10,8 @@
#include "trace.h"
-static char *perf_trace_buf;
-static char *perf_trace_buf_nmi;
+static char __percpu *perf_trace_buf;
+static char __percpu *perf_trace_buf_nmi;
typedef typeof(char [FTRACE_MAX_PROFILE_SIZE]) perf_trace_t ;
@@ -20,20 +20,20 @@ static int total_profile_count;
static int ftrace_profile_enable_event(struct ftrace_event_call *event)
{
- char *buf;
+ char __percpu *buf;
int ret = -ENOMEM;
if (event->profile_count++ > 0)
return 0;
if (!total_profile_count) {
- buf = (char *)alloc_percpu(perf_trace_t);
+ buf = (char __percpu *)alloc_percpu(perf_trace_t);
if (!buf)
goto fail_buf;
rcu_assign_pointer(perf_trace_buf, buf);
- buf = (char *)alloc_percpu(perf_trace_t);
+ buf = (char __percpu *)alloc_percpu(perf_trace_t);
if (!buf)
goto fail_buf_nmi;
@@ -79,7 +79,7 @@ int ftrace_profile_enable(int event_id)
static void ftrace_profile_disable_event(struct ftrace_event_call *event)
{
- char *buf, *nmi_buf;
+ char __percpu *buf, *nmi_buf;
if (--event->profile_count > 0)
return;
@@ -123,7 +123,8 @@ __kprobes void *ftrace_perf_buf_prepare(
int *rctxp, unsigned long *irq_flags)
{
struct trace_entry *entry;
- char *trace_buf, *raw_data;
+ char __percpu *trace_buf;
+ char *raw_data;
int pc, cpu;
pc = preempt_count();
Index: linux-2.6-tip/kernel/trace/trace_functions_graph.c
===================================================================
--- linux-2.6-tip.orig/kernel/trace/trace_functions_graph.c
+++ linux-2.6-tip/kernel/trace/trace_functions_graph.c
@@ -21,7 +21,7 @@ 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;
Index: linux-2.6-tip/kernel/trace/trace_ksym.c
===================================================================
--- linux-2.6-tip.orig/kernel/trace/trace_ksym.c
+++ linux-2.6-tip/kernel/trace/trace_ksym.c
@@ -42,7 +42,7 @@
#define KSYM_TRACER_OP_LEN 3 /* rw- */
struct trace_ksym {
- struct perf_event **ksym_hbp;
+ struct perf_event * __percpu *ksym_hbp;
struct perf_event_attr attr;
#ifdef CONFIG_PROFILE_KSYM_TRACER
atomic64_t counter;
@@ -200,8 +200,8 @@ int process_new_ksym_entry(char *ksymnam
entry->ksym_hbp = register_wide_hw_breakpoint(&entry->attr,
ksym_hbp_handler);
- if (IS_ERR(entry->ksym_hbp)) {
- ret = PTR_ERR(entry->ksym_hbp);
+ if (IS_ERR((void __force *)entry->ksym_hbp)) {
+ ret = PTR_ERR((void __force *)entry->ksym_hbp);
printk(KERN_INFO "ksym_tracer request failed. Try again"
" later!!\n");
goto err;
@@ -331,8 +331,8 @@ static ssize_t ksym_trace_filter_write(s
entry->ksym_hbp =
register_wide_hw_breakpoint(&entry->attr,
ksym_hbp_handler);
- if (IS_ERR(entry->ksym_hbp))
- ret = PTR_ERR(entry->ksym_hbp);
+ if (IS_ERR((void __force *)entry->ksym_hbp))
+ ret = PTR_ERR((void __force *)entry->ksym_hbp);
else
goto out_unlock;
}
--
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