/*
* Traverse the ftrace_global_list, invoking all entries. The reason that we
- * can use rcu_dereference_raw() is that elements removed from this list
+ * can use rcu_dereference_raw_notrace() is that elements removed from this list
* are simply leaked, so there is no need to interact with a grace-period
- * mechanism. The rcu_dereference_raw() calls are needed to handle
+ * mechanism. The rcu_dereference_raw_notrace() calls are needed to handle
* concurrent insertions into the ftrace_global_list.
*
* Silly Alpha and silly pointer-speculation compiler optimizations!
*/
#define do_for_each_ftrace_op(op, list) \
- op = rcu_dereference_raw(list); \
+ op = rcu_dereference_raw_notrace(list); \
do
/*
* Optimized for just a single item in the list (as that is the normal case).
*/
#define while_for_each_ftrace_op(op) \
- while (likely(op = rcu_dereference_raw((op)->next)) && \
+ while (likely(op = rcu_dereference_raw_notrace((op)->next)) && \
unlikely((op) != &ftrace_list_end))
static inline void ftrace_ops_init(struct ftrace_ops *ops)
if (hlist_empty(hhd))
return NULL;
- hlist_for_each_entry_rcu(rec, hhd, node) {
+ hlist_for_each_entry_rcu_notrace(rec, hhd, node) {
if (rec->ip == ip)
return rec;
}
hhd = &hash->buckets[key];
- hlist_for_each_entry_rcu(entry, hhd, hlist) {
+ hlist_for_each_entry_rcu_notrace(entry, hhd, hlist) {
if (entry->ip == ip)
return entry;
}
struct ftrace_hash *notrace_hash;
int ret;
- filter_hash = rcu_dereference_raw(ops->filter_hash);
- notrace_hash = rcu_dereference_raw(ops->notrace_hash);
+ filter_hash = rcu_dereference_raw_notrace(ops->filter_hash);
+ notrace_hash = rcu_dereference_raw_notrace(ops->notrace_hash);
if ((ftrace_hash_empty(filter_hash) ||
ftrace_lookup_ip(filter_hash, ip)) &&
!ftrace_lookup_ip(ops->notrace_hash, rec->ip)) ||
((iter->flags & FTRACE_ITER_ENABLED) &&
- !(rec->flags & ~FTRACE_FL_MASK))) {
+ !(rec->flags & FTRACE_FL_ENABLED))) {
rec = NULL;
goto retry;
return -ENOMEM;
}
+ iter->ops = ops;
+ iter->flags = flag;
+
+ mutex_lock(&ops->regex_lock);
+
if (flag & FTRACE_ITER_NOTRACE)
hash = ops->notrace_hash;
else
hash = ops->filter_hash;
- iter->ops = ops;
- iter->flags = flag;
-
if (file->f_mode & FMODE_WRITE) {
- mutex_lock(&ftrace_lock);
iter->hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, hash);
- mutex_unlock(&ftrace_lock);
-
if (!iter->hash) {
trace_parser_put(&iter->parser);
kfree(iter);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out_unlock;
}
}
- mutex_lock(&ops->regex_lock);
-
if ((file->f_mode & FMODE_WRITE) &&
(file->f_flags & O_TRUNC))
ftrace_filter_reset(iter->hash);
}
} else
file->private_data = iter;
+
+ out_unlock:
mutex_unlock(&ops->regex_lock);
return ret;
* on the hash. rcu_read_lock is too dangerous here.
*/
preempt_disable_notrace();
- hlist_for_each_entry_rcu(entry, hhd, node) {
+ hlist_for_each_entry_rcu_notrace(entry, hhd, node) {
if (entry->ip == ip)
entry->ops->func(ip, parent_ip, &entry->data);
}
int ret;
int i;
- if (ftrace_probe_registered)
+ if (ftrace_probe_registered) {
+ /* still need to update the function call sites */
+ if (ftrace_enabled)
+ ftrace_run_update_code(FTRACE_UPDATE_CALLS);
return;
+ }
for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) {
struct hlist_head *hhd = &ftrace_func_hash[i];
if (WARN_ON(not))
return -EINVAL;
- mutex_lock(&ftrace_lock);
+ mutex_lock(&trace_probe_ops.regex_lock);
hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash);
if (!hash) {
count = -ENOMEM;
- goto out_unlock;
+ goto out;
}
if (unlikely(ftrace_disabled)) {
count = -ENODEV;
- goto out_unlock;
+ goto out;
}
+ mutex_lock(&ftrace_lock);
+
do_for_each_ftrace_rec(pg, rec) {
if (!ftrace_match_record(rec, NULL, search, len, type))
out_unlock:
mutex_unlock(&ftrace_lock);
+ out:
+ mutex_unlock(&trace_probe_ops.regex_lock);
free_ftrace_hash(hash);
return count;
return;
}
- mutex_lock(&ftrace_lock);
+ mutex_lock(&trace_probe_ops.regex_lock);
hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash);
if (!hash)
list_add(&entry->free_list, &free_list);
}
}
+ mutex_lock(&ftrace_lock);
__disable_ftrace_function_probe();
/*
* Remove after the disable is called. Otherwise, if the last
list_del(&entry->free_list);
ftrace_free_entry(entry);
}
+ mutex_unlock(&ftrace_lock);
out_unlock:
- mutex_unlock(&ftrace_lock);
+ mutex_unlock(&trace_probe_ops.regex_lock);
free_ftrace_hash(hash);
}
} else
iter = file->private_data;
- mutex_lock(&iter->ops->regex_lock);
-
- ret = -ENODEV;
if (unlikely(ftrace_disabled))
- goto out_unlock;
+ return -ENODEV;
+
+ /* iter->hash is a local copy, so we don't need regex_lock */
parser = &iter->parser;
read = trace_get_user(parser, ubuf, cnt, ppos);
parser->idx, enable);
trace_parser_clear(parser);
if (ret < 0)
- goto out_unlock;
+ goto out;
}
ret = read;
-out_unlock:
- mutex_unlock(&iter->ops->regex_lock);
-
+ out:
return ret;
}
if (unlikely(ftrace_disabled))
return -ENODEV;
+ mutex_lock(&ops->regex_lock);
+
if (enable)
orig_hash = &ops->filter_hash;
else
orig_hash = &ops->notrace_hash;
hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash);
- if (!hash)
- return -ENOMEM;
+ if (!hash) {
+ ret = -ENOMEM;
+ goto out_regex_unlock;
+ }
- mutex_lock(&ops->regex_lock);
if (reset)
ftrace_filter_reset(hash);
if (buf && !ftrace_match_records(hash, buf, len)) {
} else
iter = file->private_data;
- mutex_lock(&iter->ops->regex_lock);
-
parser = &iter->parser;
if (trace_parser_loaded(parser)) {
parser->buffer[parser->idx] = 0;
trace_parser_put(parser);
+ mutex_lock(&iter->ops->regex_lock);
+
if (file->f_mode & FMODE_WRITE) {
filter_hash = !!(iter->flags & FTRACE_ITER_FILTER);
mutex_unlock(&ftrace_lock);
}
+
+ mutex_unlock(&iter->ops->regex_lock);
free_ftrace_hash(iter->hash);
kfree(iter);
- mutex_unlock(&iter->ops->regex_lock);
return 0;
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff