ftrace: Remove FTRACE_FL_FAILED flag
Since we disable all function tracer processing if we detect that a modification of a instruction had failed, we do not need to track that the record has failed. No more ftrace processing is allowed, and the FTRACE_FL_FAILED flag is pointless. Removing this flag simplifies some of the code, but some ftrace_disabled checks needed to be added or move around a little. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt
Steven Rostedt
Родитель
3499e46114
Коммит
45a4a2372b
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@ -147,11 +147,10 @@ extern int ftrace_text_reserved(void *start, void *end);
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enum {
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FTRACE_FL_FREE = (1 << 0),
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FTRACE_FL_FAILED = (1 << 1),
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FTRACE_FL_FILTER = (1 << 2),
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FTRACE_FL_ENABLED = (1 << 3),
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FTRACE_FL_NOTRACE = (1 << 4),
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FTRACE_FL_CONVERTED = (1 << 5),
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FTRACE_FL_FILTER = (1 << 1),
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FTRACE_FL_ENABLED = (1 << 2),
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FTRACE_FL_NOTRACE = (1 << 3),
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FTRACE_FL_CONVERTED = (1 << 4),
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};
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struct dyn_ftrace {
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@ -1083,19 +1083,20 @@ static void ftrace_replace_code(int enable)
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struct ftrace_page *pg;
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int failed;
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if (unlikely(ftrace_disabled))
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return;
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do_for_each_ftrace_rec(pg, rec) {
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/*
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* Skip over free records, records that have
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* failed and not converted.
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*/
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if (rec->flags & FTRACE_FL_FREE ||
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rec->flags & FTRACE_FL_FAILED ||
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!(rec->flags & FTRACE_FL_CONVERTED))
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continue;
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failed = __ftrace_replace_code(rec, enable);
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if (failed) {
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rec->flags |= FTRACE_FL_FAILED;
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ftrace_bug(failed, rec->ip);
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/* Stop processing */
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return;
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@ -1111,10 +1112,12 @@ ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)
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ip = rec->ip;
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if (unlikely(ftrace_disabled))
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return 0;
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ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
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if (ret) {
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ftrace_bug(ret, ip);
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rec->flags |= FTRACE_FL_FAILED;
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return 0;
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}
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return 1;
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@ -1466,6 +1469,9 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
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struct ftrace_iterator *iter = m->private;
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struct dyn_ftrace *rec = NULL;
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if (unlikely(ftrace_disabled))
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return NULL;
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if (iter->flags & FTRACE_ITER_HASH)
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return t_hash_next(m, pos);
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@ -1518,6 +1524,10 @@ static void *t_start(struct seq_file *m, loff_t *pos)
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loff_t l;
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mutex_lock(&ftrace_lock);
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if (unlikely(ftrace_disabled))
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return NULL;
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/*
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* If an lseek was done, then reset and start from beginning.
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*/
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@ -1636,8 +1646,6 @@ static void ftrace_filter_reset(int enable)
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if (enable)
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ftrace_filtered = 0;
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do_for_each_ftrace_rec(pg, rec) {
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if (rec->flags & FTRACE_FL_FAILED)
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continue;
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rec->flags &= ~type;
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} while_for_each_ftrace_rec();
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mutex_unlock(&ftrace_lock);
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@ -1767,9 +1775,6 @@ static int ftrace_match_records(char *buff, int len, int enable)
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mutex_lock(&ftrace_lock);
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do_for_each_ftrace_rec(pg, rec) {
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if (rec->flags & FTRACE_FL_FAILED)
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continue;
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if (ftrace_match_record(rec, search, search_len, type)) {
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if (not)
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rec->flags &= ~flag;
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@ -1837,10 +1842,11 @@ static int ftrace_match_module_records(char *buff, char *mod, int enable)
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}
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mutex_lock(&ftrace_lock);
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do_for_each_ftrace_rec(pg, rec) {
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if (rec->flags & FTRACE_FL_FAILED)
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continue;
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if (unlikely(ftrace_disabled))
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goto out_unlock;
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do_for_each_ftrace_rec(pg, rec) {
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if (ftrace_match_module_record(rec, mod,
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search, search_len, type)) {
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@ -1854,6 +1860,7 @@ static int ftrace_match_module_records(char *buff, char *mod, int enable)
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ftrace_filtered = 1;
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} while_for_each_ftrace_rec();
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out_unlock:
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mutex_unlock(&ftrace_lock);
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return found;
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@ -2008,10 +2015,11 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
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return -EINVAL;
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mutex_lock(&ftrace_lock);
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do_for_each_ftrace_rec(pg, rec) {
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if (rec->flags & FTRACE_FL_FAILED)
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continue;
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if (unlikely(ftrace_disabled))
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goto out_unlock;
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do_for_each_ftrace_rec(pg, rec) {
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if (!ftrace_match_record(rec, search, len, type))
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continue;
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@ -2218,6 +2226,10 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
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mutex_lock(&ftrace_regex_lock);
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ret = -ENODEV;
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if (unlikely(ftrace_disabled))
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goto out_unlock;
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if (file->f_mode & FMODE_READ) {
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struct seq_file *m = file->private_data;
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iter = m->private;
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@ -2545,9 +2557,6 @@ ftrace_set_func(unsigned long *array, int *idx, char *buffer)
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bool exists;
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int i;
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if (ftrace_disabled)
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return -ENODEV;
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/* decode regex */
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type = filter_parse_regex(buffer, strlen(buffer), &search, ¬);
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if (!not && *idx >= FTRACE_GRAPH_MAX_FUNCS)
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@ -2556,9 +2565,15 @@ ftrace_set_func(unsigned long *array, int *idx, char *buffer)
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search_len = strlen(search);
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mutex_lock(&ftrace_lock);
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if (unlikely(ftrace_disabled)) {
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mutex_unlock(&ftrace_lock);
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return -ENODEV;
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}
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do_for_each_ftrace_rec(pg, rec) {
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if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE))
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if (rec->flags & FTRACE_FL_FREE)
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continue;
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if (ftrace_match_record(rec, search, search_len, type)) {
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@ -2700,10 +2715,11 @@ void ftrace_release_mod(struct module *mod)
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struct dyn_ftrace *rec;
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struct ftrace_page *pg;
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if (ftrace_disabled)
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return;
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mutex_lock(&ftrace_lock);
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if (ftrace_disabled)
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goto out_unlock;
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do_for_each_ftrace_rec(pg, rec) {
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if (within_module_core(rec->ip, mod)) {
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/*
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@ -2714,6 +2730,7 @@ void ftrace_release_mod(struct module *mod)
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ftrace_free_rec(rec);
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}
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} while_for_each_ftrace_rec();
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out_unlock:
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mutex_unlock(&ftrace_lock);
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}
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@ -3108,16 +3125,17 @@ void ftrace_kill(void)
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*/
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int register_ftrace_function(struct ftrace_ops *ops)
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{
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int ret;
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if (unlikely(ftrace_disabled))
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return -1;
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int ret = -1;
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mutex_lock(&ftrace_lock);
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if (unlikely(ftrace_disabled))
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goto out_unlock;
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ret = __register_ftrace_function(ops);
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ftrace_startup(0);
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out_unlock:
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mutex_unlock(&ftrace_lock);
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return ret;
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}
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@ -3145,14 +3163,14 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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int ret;
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if (unlikely(ftrace_disabled))
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return -ENODEV;
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int ret = -ENODEV;
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mutex_lock(&ftrace_lock);
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ret = proc_dointvec(table, write, buffer, lenp, ppos);
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if (unlikely(ftrace_disabled))
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goto out;
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ret = proc_dointvec(table, write, buffer, lenp, ppos);
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if (ret || !write || (last_ftrace_enabled == !!ftrace_enabled))
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goto out;
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