tree 24eff58c6d06a87f4413ab43c481d14c864d2b25
parent caf69ba62768d3bae4fa8e6ad734cd5565207bd4
author Michael Ellerman <mpe@ellerman.id.au> 1402382781 +1000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1402470221 +1000

powerpc/perf: Ensure all EBB register state is cleared on fork()

In commit 330a1eb "Core EBB support for 64-bit book3s" I messed up
clear_task_ebb(). It clears some but not all of the task's Event Based
Branch (EBB) registers when we duplicate a task struct.

That allows a child task to observe the EBBHR & EBBRR of its parent,
which it should not be able to do.

Fix it by clearing EBBHR & EBBRR.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: stable@vger.kernel.org [v3.11+]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>