tree a6fb97f2cfce93e5c8ff10351cd3f4763ae1fc4e
parent 2f59be5b970b503ca8db1cb723b155e455ebac8e
author Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> 1492606346 +0530
committer Michael Ellerman <mpe@ellerman.id.au> 1493024878 +1000

powerpc/kprobes: Add support for KPROBES_ON_FTRACE

Allow kprobes to be placed on ftrace _mcount() call sites. This optimization
avoids the use of a trap, by riding on ftrace infrastructure.

This depends on HAVE_DYNAMIC_FTRACE_WITH_REGS which depends on MPROFILE_KERNEL,
which is only currently enabled on powerpc64le with newer toolchains.

Based on the x86 code by Masami.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>