diff options
| author | Jiri Olsa <jolsa@redhat.com> | 2021-12-06 19:20:30 +0100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-12-08 12:12:02 -0500 |
| commit | 7d5b7cad79da76f3dad4a9f6040e524217814e5a (patch) | |
| tree | 5817f644a9a71a690dad2c14a275f4f9cb5e7ff2 /kernel | |
| parent | 48b27b6b5191e2e1f2798cd80877b6e4ef47c351 (diff) | |
ftrace: Use direct_ops hash in unregister_ftrace_direct
Now when we have *direct_multi interface the direct_functions
hash is no longer owned just by direct_ops. It's also used by
any other ftrace_ops passed to *direct_multi interface.
Thus to find out that we are unregistering the last function
from direct_ops, we need to check directly direct_ops's hash.
Link: https://lkml.kernel.org/r/20211206182032.87248-2-jolsa@kernel.org
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Fixes: f64dd4627ec6 ("ftrace: Add multi direct register/unregister interface")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/ftrace.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 30bc880c3849..7f0594e28226 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -5217,6 +5217,7 @@ int unregister_ftrace_direct(unsigned long ip, unsigned long addr) { struct ftrace_direct_func *direct; struct ftrace_func_entry *entry; + struct ftrace_hash *hash; int ret = -ENODEV; mutex_lock(&direct_mutex); @@ -5225,7 +5226,8 @@ int unregister_ftrace_direct(unsigned long ip, unsigned long addr) if (!entry) goto out_unlock; - if (direct_functions->count == 1) + hash = direct_ops.func_hash->filter_hash; + if (hash->count == 1) unregister_ftrace_function(&direct_ops); ret = ftrace_set_filter_ip(&direct_ops, ip, 1, 0); |