Add ftrace warn on to disable ftrace as well as report a warning.

Signed-off-by: Steven Rostedt
---
kernel/trace/ftrace.c | 29 ++++++++++++++++++++++-------
1 file changed, 22 insertions(+), 7 deletions(-)

Index: linux-compile.git/kernel/trace/ftrace.c
================================================== =================
--- linux-compile.git.orig/kernel/trace/ftrace.c 2008-10-22 13:17:29.000000000 -0400
+++ linux-compile.git/kernel/trace/ftrace.c 2008-10-22 13:20:11.000000000 -0400
@@ -32,6 +32,24 @@

#include "trace.h"

+#define FTRACE_WARN_ON(cond) \
+ do { \
+ if (unlikely(cond)) { \
+ WARN_ON(1); \
+ ftrace_kill(); \
+ } \
+ } while (0)
+
+#define FTRACE_WARN_ON_ONCE(cond) \
+ do { \
+ static int once; \
+ if (unlikely(cond) && !once) { \
+ once++; \
+ WARN_ON(1); \
+ 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;
@@ -358,10 +376,8 @@ static struct dyn_ftrace *ftrace_alloc_d
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;
}

@@ -410,7 +426,7 @@ 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;
@@ -600,7 +616,7 @@ ftrace_code_disable(struct dyn_ftrace *r

ret = ftrace_modify_code(ip, call, nop);
if (ret) {
- WARN_ON_ONCE(1);
+ FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace failed to modify ");
print_ip_sym(ip);
print_ip_ins(" expected: ", call);
@@ -1660,8 +1676,7 @@ 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);

--
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