tree 53db6e201e605c1926adc74fa965b1a615066da8
parent 088b1e427dbba2af93cb6a7d39258c10ff58dd27
author Steven Rostedt <srostedt@redhat.com> 1210620048 +0200
committer Thomas Gleixner <tglx@linutronix.de> 1211568844 +0200

ftrace - fix dynamic ftrace memory leak

The ftrace dynamic function update allocates a record to store the
instruction pointers that are being modified. If the modified
instruction pointer fails to update, then the record is marked as
failed and nothing more is done.

Worse, if the modification fails, but the record ip function is still
called, it will allocate a new record and try again. In just a matter
of time, will this cause a serious memory leak and crash the system.

This patch plugs this memory leak. When a record fails, it is
included back into the pool of records to be used. Now a record may
fail over and over again, but the number of allocated records will
not increase.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>