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authorAbhishek Sagar <sagar.abhishek@gmail.com>2008-06-01 21:47:30 +0530
committerIngo Molnar <mingo@elte.hu>2008-06-10 11:56:57 +0200
commit0eb967012ea15e6e8cfab483d9fa37bc602d400c (patch)
tree0e9c026a2d83f313cdc3f9f235d58ff522cee090 /include
parente0773410247f1e5fc6f7c52a4c5f3c6c9873d527 (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ftrace.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 623819433ed..20e14d0093c 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -49,6 +49,7 @@ enum {
FTRACE_FL_FILTER = (1 << 2),
FTRACE_FL_ENABLED = (1 << 3),
FTRACE_FL_NOTRACE = (1 << 4),
+ FTRACE_FL_CONVERTED = (1 << 5),
};
struct dyn_ftrace {