commit e6c4dcb308160115287afd87afb63b5684d75a5b
author Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Mon Oct 30 20:42:09 2017 +0530
committer Michael Ellerman <mpe@ellerman.id.au> Wed Nov 01 15:51:03 2017 +1100
tree 39f5d7025289979f52bf1c787db5102f2889995d
parent 63be1a81e40733ecd175713b6a7558dc43f00851

powerpc/kprobes: Dereference function pointers only if the address does not belong to kernel text

This makes the changes introduced in commit 83e840c770f2c5
("powerpc64/elfv1: Only dereference function descriptor for non-text
symbols") to be specific to the kprobe subsystem.

We previously changed ppc_function_entry() to always check the provided
address to confirm if it needed to be dereferenced. This is actually
only an issue for kprobe blacklisted asm labels (through use of
_ASM_NOKPROBE_SYMBOL) and can cause other issues with ftrace. Also, the
additional checks are not really necessary for our other uses.

As such, move this check to the kprobes subsystem.

Fixes: 83e840c770f2 ("powerpc64/elfv1: Only dereference function descriptor for non-text symbols")
Cc: stable@vger.kernel.org # v4.13+
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>