sh: ftrace: Make code modification NMI safe.

This cribs the x86 implementation of ftrace_nmi_enter() and friends to
make ftrace_modify_code() NMI safe, particularly on SMP configurations.

For additional notes on the problems involved, see the comment below
ftrace_call_replace().

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index b940424f8ccc..5260fb55ab7f 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -38,6 +38,7 @@ config SUPERH32
         select HAVE_DYNAMIC_FTRACE
         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
         select HAVE_FTRACE_SYSCALLS
+        select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
         select HAVE_FUNCTION_GRAPH_TRACER
         select HAVE_ARCH_KGDB
         select ARCH_HIBERNATION_POSSIBLE if MMU