On 25/02/16 01:28, Michael Ellerman wrote:

is_early_mcount_callsite() needs to detect either the two instruction or
the three instruction versions of the _mcount() sequence.

But if we're running a kernel with the two instruction sequence, we need
to be careful not to read instruction - 2, otherwise we might fall off
the front of a page and cause an oops.

While we're here convert to bool to make the return semantics clear.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/kernel/module_64.c | 30 ++++++++++++++----------------
 1 file changed, 14 insertions(+), 16 deletions(-)

Squash.

Do we even need to do this anymore?

Balbir Singh.