Revert "kprobes: Warn if optprobe handler tries to change execution path"
authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Tue, 17 Oct 2017 08:18:34 +0000 (13:48 +0530)
committerIngo Molnar <mingo@kernel.org>
Wed, 18 Oct 2017 13:21:35 +0000 (15:21 +0200)
commit4f3a871443669c6b4d458a60ac8d8ca5eedc3f97
tree44ee4a6308eca2341ed70dc9accc001bb75300f8
parent4b50239a769e78bbe362fc92c3f8bd5415a4a5f5
Revert "kprobes: Warn if optprobe handler tries to change execution path"

This reverts commit:

  e863d539614641 ("kprobes: Warn if optprobe handler tries to change execution path")

On PowerPC, we place a probe at kretprobe_trampoline to catch function
returns and with CONFIG_OPTPROBES=y, this probe gets optimized. This
works for us due to the way we handle the optprobe as described in
commit:

  762df10bad6954 ("powerpc/kprobes: Optimize kprobe in kretprobe_trampoline()")

With the above commit, we end up with a warning. As such, revert this change.

Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171017081834.3629-1-naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/kprobes.c