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ftrace: add ftrace warn on to disable ftrace

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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>
This commit is contained in:
Steven Rostedt 2008-10-23 09:33:03 -04:00 committed by Ingo Molnar
parent 81adbdc029
commit 6912896e99
1 changed files with 19 additions and 10 deletions
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29
kernel/trace/ftrace.c
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@ -32,6 +32,18 @@
#include "trace.h" #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 */ /* ftrace_enabled is a method to turn ftrace on or off */
int ftrace_enabled __read_mostly; int ftrace_enabled __read_mostly;
static int last_ftrace_enabled; static int last_ftrace_enabled;
@ -363,10 +375,8 @@ static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
rec = ftrace_free_records; rec = ftrace_free_records;
if (unlikely(!(rec->flags & FTRACE_FL_FREE))) { if (unlikely(!(rec->flags & FTRACE_FL_FREE))) {
WARN_ON_ONCE(1); FTRACE_WARN_ON_ONCE(1);
ftrace_free_records = NULL; ftrace_free_records = NULL;
ftrace_disabled = 1;
ftrace_enabled = 0;
return NULL; return NULL;
} }
@ -415,7 +425,7 @@ ftrace_record_ip(unsigned long ip)
key = hash_long(ip, FTRACE_HASHBITS); 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)) if (ftrace_ip_in_hash(ip, key))
goto out; goto out;
@ -607,12 +617,12 @@ ftrace_code_disable(struct dyn_ftrace *rec)
if (ret) { if (ret) {
switch (ret) { switch (ret) {
case -EFAULT: case -EFAULT:
WARN_ON_ONCE(1); FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace faulted on modifying "); pr_info("ftrace faulted on modifying ");
print_ip_sym(ip); print_ip_sym(ip);
break; break;
case -EINVAL: case -EINVAL:
WARN_ON_ONCE(1); FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace failed to modify "); pr_info("ftrace failed to modify ");
print_ip_sym(ip); print_ip_sym(ip);
print_ip_ins(" expected: ", call); print_ip_ins(" expected: ", call);
@ -621,12 +631,12 @@ ftrace_code_disable(struct dyn_ftrace *rec)
printk(KERN_CONT "\n"); printk(KERN_CONT "\n");
break; break;
case -EPERM: case -EPERM:
WARN_ON_ONCE(1); FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace faulted on writing "); pr_info("ftrace faulted on writing ");
print_ip_sym(ip); print_ip_sym(ip);
break; break;
default: default:
WARN_ON_ONCE(1); FTRACE_WARN_ON_ONCE(1);
pr_info("ftrace faulted on unknown error "); pr_info("ftrace faulted on unknown error ");
print_ip_sym(ip); print_ip_sym(ip);
} }
@ -1722,8 +1732,7 @@ static int ftraced(void *ignore)
ftrace_update_cnt != 1 ? "s" : "", ftrace_update_cnt != 1 ? "s" : "",
ftrace_update_tot_cnt, ftrace_update_tot_cnt,
usecs, usecs != 1 ? "s" : ""); usecs, usecs != 1 ? "s" : "");
ftrace_disabled = 1; FTRACE_WARN_ON_ONCE(1);
WARN_ON_ONCE(1);
} }
} }
mutex_unlock(&ftraced_lock); mutex_unlock(&ftraced_lock);