tree 0e9c026a2d83f313cdc3f9f235d58ff522cee090
parent e0773410247f1e5fc6f7c52a4c5f3c6c9873d527
author Abhishek Sagar <sagar.abhishek@gmail.com> 1212337050 +0530
committer Ingo Molnar <mingo@elte.hu> 1213091817 +0200

ftrace: prevent freeing of all failed updates

Prevent freeing of records which cause problems and correspond to function from
core kernel text. A new flag, FTRACE_FL_CONVERTED is used to mark a record
as "converted". All other records are patched lazily to NOPs. Failed records
now also remain on frace_hash table. Each invocation of ftrace_record_ip now
checks whether the traced function has ever been recorded (including past
failures) and doesn't re-record it again.

Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>