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authorSteven Rostedt <rostedt@goodmis.org>2008-10-23 09:33:03 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-23 16:00:20 +0200
commit6912896e994ddaf06cc0f6d3f2098bc4b59bdd84 (patch)
tree5f60e432eb5ec6cf0268ddc4d96f901578886c29
parent81adbdc029ecc416d56563e7f159100181dd711d (diff)
ftrace: add ftrace warn on to disable ftrace
Add ftrace warn on to disable ftrace as well as report a warning. [ Thanks to Andrew Morton for suggesting using the WARN_ON return value ] Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/trace/ftrace.c29
1 files changed, 19 insertions, 10 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 93245ae046e..b08996ca561 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -32,6 +32,18 @@
#include "trace.h"
+#define FTRACE_WARN_ON(cond) \
+ do { \
+ if (WARN_ON(cond)) \
+ ftrace_kill(); \
+ } while (0)
+
+#define FTRACE_WARN_ON_ONCE(cond) \
+ do { \
+ if (WARN_ON_ONCE(cond)) \
+ ftrace_kill(); \
+ } while (0)
+
/* ftrace_enabled is a method to turn ftrace on or off */
int ftrace_enabled __read_mostly;
static int last_ftrace_enabled;
@@ -363,10 +375,8 @@ static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
rec = ftrace_free_records;
if (unlikely(!(rec->flags & FTRACE_FL_FREE))) {
- WARN_ON_ONCE(1);
+ FTRACE_WARN_ON_ONCE(1);
ftrace_free_records = NULL;
- ftrace_disabled = 1;
- ftrace_enabled = 0;
return NULL;
}
@@ -415,7 +425,7 @@ ftrace_record_ip(unsigned long ip)
key = hash_long(ip, FTRACE_HASHBITS);
- WARN_ON_ONCE(key >= FTRACE_HASHSIZE);
+ FTRACE_WARN_ON_ONCE(key >= FTRACE_HASHSIZE);
if (ftrace_ip_in_hash(ip, key))
goto out;
@@ -607,12 +617,12 @@ ftrace_code_disable(struct dyn_ftrace *rec)
if (ret) {
switch (ret) {
case -EFAULT:
- WARN_ON_ONCE(1);
+ FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace faulted on modifying ");
print_ip_sym(ip);
break;
case -EINVAL:
- WARN_ON_ONCE(1);
+ FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace failed to modify ");
print_ip_sym(ip);
print_ip_ins(" expected: ", call);
@@ -621,12 +631,12 @@ ftrace_code_disable(struct dyn_ftrace *rec)
printk(KERN_CONT "\n");
break;
case -EPERM:
- WARN_ON_ONCE(1);
+ FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace faulted on writing ");
print_ip_sym(ip);
break;
default:
- WARN_ON_ONCE(1);
+ FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace faulted on unknown error ");
print_ip_sym(ip);
}
@@ -1722,8 +1732,7 @@ static int ftraced(void *ignore)
ftrace_update_cnt != 1 ? "s" : "",
ftrace_update_tot_cnt,
usecs, usecs != 1 ? "s" : "");
- ftrace_disabled = 1;
- WARN_ON_ONCE(1);
+ FTRACE_WARN_ON_ONCE(1);
}
}
mutex_unlock(&ftraced_lock);