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| author | Joel Fernandes <joelaf@google.com> | 2016-11-15 12:31:20 -0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2016-11-15 16:34:30 -0800 |
| commit | d032ae8921ea792c1e6b2abb44022b2403f651f6 (patch) | |
| tree | 43e227118b9111e27a0df4f199e6632d552311dc /kernel/trace | |
| parent | a5d23b956cabd5931d4aff07573cd9d053bacd74 (diff) | |
| download | op-kernel-dev-d032ae8921ea792c1e6b2abb44022b2403f651f6.zip op-kernel-dev-d032ae8921ea792c1e6b2abb44022b2403f651f6.tar.gz | |
ftrace: Provide API to use global filtering for ftrace ops
Currently the global_ops filtering hash is not available to outside users
registering for function tracing. Provide an API for those users to be
able to choose global filtering.
This is in preparation for pstore's ftrace feature to be able to
use the global filters.
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Joel Fernandes <joelaf@google.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/ftrace.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 2050a765..89d46e1c 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -4239,6 +4239,23 @@ int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, } EXPORT_SYMBOL_GPL(ftrace_set_filter_ip); +/** + * ftrace_ops_set_global_filter - setup ops to use global filters + * @ops - the ops which will use the global filters + * + * ftrace users who need global function trace filtering should call this. + * It can set the global filter only if ops were not initialized before. + */ +void ftrace_ops_set_global_filter(struct ftrace_ops *ops) +{ + if (ops->flags & FTRACE_OPS_FL_INITIALIZED) + return; + + ftrace_ops_init(ops); + ops->func_hash = &global_ops.local_hash; +} +EXPORT_SYMBOL_GPL(ftrace_ops_set_global_filter); + static int ftrace_set_regex(struct ftrace_ops *ops, unsigned char *buf, int len, int reset, int enable) |
