xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ftrace: Provide API to use global filtering for ftrace ops

Browse Source 
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>
This commit is contained in:
Joel Fernandes
2016-11-15 12:31:20 -08:00
committed by Kees Cook
parent a5d23b956c
commit d032ae8921
2 changed files with 19 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
kernel/trace/ftrace.c
View File

@@ -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)