[PATCH] uprobes/powerpc: Add dependency on single step emulation

[Suzuki K. Poulose]

From: Suzuki K. Poulose <suzuki@xxxxxxxxxx>

Uprobes uses emulate_step in sstep.c, but we haven't explicitly specified
the dependency. On pseries HAVE_HW_BREAKPOINT protects us, but 44x has no
such luxury.

Consolidate other users that depend on sstep and create a new config option.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Signed-off-by: Suzuki K. Poulose <suzuki@xxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
---
 arch/powerpc/Kconfig      |    4 ++++
 arch/powerpc/lib/Makefile |    4 +---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 17903f1..dabe429 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -275,6 +275,10 @@ config PPC_ADV_DEBUG_DAC_RANGE
 	depends on PPC_ADV_DEBUG_REGS && 44x
 	default y
 
+config PPC_EMULATE_SSTEP
+	bool
+	default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
+
 source "init/Kconfig"
 
 source "kernel/Kconfig.freezer"
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 746e0c8..35baad9 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -19,9 +19,7 @@ obj-$(CONFIG_PPC64)	+= copypage_64.o copyuser_64.o \
 			   checksum_wrappers_64.o hweight_64.o \
 			   copyuser_power7.o string_64.o copypage_power7.o \
 			   memcpy_power7.o
-obj-$(CONFIG_XMON)	+= sstep.o ldstfp.o
-obj-$(CONFIG_KPROBES)	+= sstep.o ldstfp.o
-obj-$(CONFIG_HAVE_HW_BREAKPOINT)	+= sstep.o ldstfp.o
+obj-$(CONFIG_PPC_EMULATE_SSTEP)	+= sstep.o ldstfp.o
 
 ifeq ($(CONFIG_PPC64),y)
 obj-$(CONFIG_SMP)	+= locks.o

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