sh: Add kprobes support.

Initial support for kprobes/kretprobes for 32-bit SH platforms.

[ General cleanup and some rework for the kretprobe hash lock. -- PFM ]

Signed-off-by: Chris Smith <chris.smith@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/Makefile_32 b/arch/sh/kernel/Makefile_32
index 0e6905f..12e617b 100644
--- a/arch/sh/kernel/Makefile_32
+++ b/arch/sh/kernel/Makefile_32
@@ -23,5 +23,6 @@
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
 obj-$(CONFIG_ELF_CORE)		+= dump_task.o
 obj-$(CONFIG_IO_TRAPPED)	+= io_trapped.o
+obj-$(CONFIG_KPROBES)		+= kprobes.o
 
 EXTRA_CFLAGS += -Werror