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| author | Zheng Yejian <zhengyejian1@huawei.com> | 2022-09-26 15:20:08 +0000 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-09-27 14:48:26 -0400 |
| commit | 0ce0638edf5ec83343302b884fa208179580700a (patch) | |
| tree | 7afedb8a9f7801a2f87710d2bc7deaa4635bc1d8 /kernel | |
| parent | dc399adecd4e2826868e5d116a58e33071b18346 (diff) | |
| download | linux-stable-0ce0638edf5ec83343302b884fa208179580700a.tar.gz linux-stable-0ce0638edf5ec83343302b884fa208179580700a.tar.bz2 linux-stable-0ce0638edf5ec83343302b884fa208179580700a.zip | |
ftrace: Properly unset FTRACE_HASH_FL_MOD
When executing following commands like what document said, but the log
"#### all functions enabled ####" was not shown as expect:
1. Set a 'mod' filter:
$ echo 'write*:mod:ext3' > /sys/kernel/tracing/set_ftrace_filter
2. Invert above filter:
$ echo '!write*:mod:ext3' >> /sys/kernel/tracing/set_ftrace_filter
3. Read the file:
$ cat /sys/kernel/tracing/set_ftrace_filter
By some debugging, I found that flag FTRACE_HASH_FL_MOD was not unset
after inversion like above step 2 and then result of ftrace_hash_empty()
is incorrect.
Link: https://lkml.kernel.org/r/20220926152008.2239274-1-zhengyejian1@huawei.com
Cc: <mingo@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 8c08f0d5c6fb ("ftrace: Have cached module filters be an active filter")
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/ftrace.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 439e2ab6905e..5a1ec7e1af33 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -6081,8 +6081,12 @@ int ftrace_regex_release(struct inode *inode, struct file *file) if (filter_hash) { orig_hash = &iter->ops->func_hash->filter_hash; - if (iter->tr && !list_empty(&iter->tr->mod_trace)) - iter->hash->flags |= FTRACE_HASH_FL_MOD; + if (iter->tr) { + if (list_empty(&iter->tr->mod_trace)) + iter->hash->flags &= ~FTRACE_HASH_FL_MOD; + else + iter->hash->flags |= FTRACE_HASH_FL_MOD; + } } else orig_hash = &iter->ops->func_hash->notrace_hash; |