ftrace: prevent freeing of all failed updates

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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>

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Abhishek Sagar 2008-06-01 21:47:30 +05:30 • committed by Ingo Molnar

parent e077341024

commit 0eb967012e

2 changed files with 47 additions and 30 deletions

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include/linux/ftrace.h

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