[PATCH 07/12 v3] ftrace: add ftrace warn on to disable ftrace
From: Steven Rostedt
Date: Thu Oct 23 2008 - 09:40:18 EST
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@xxxxxxxxxx>
---
kernel/trace/ftrace.c | 29 +++++++++++++++++++----------
1 file changed, 19 insertions(+), 10 deletions(-)
Index: linux-compile.git/kernel/trace/ftrace.c
===================================================================
--- linux-compile.git.orig/kernel/trace/ftrace.c 2008-10-22 15:58:35.000000000 -0400
+++ linux-compile.git/kernel/trace/ftrace.c 2008-10-22 16:05:30.000000000 -0400
@@ -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;
@@ -358,10 +370,8 @@ 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 +420,7 @@ 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;
@@ -602,12 +612,12 @@ ftrace_code_disable(struct dyn_ftrace *r
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);
@@ -616,12 +626,12 @@ ftrace_code_disable(struct dyn_ftrace *r
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);
}
@@ -1679,8 +1689,7 @@ 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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