[PATCH v2] powerpc: Disable kcov for slb routines.

[Mahesh J Salgaonkar]

From: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>

The kcov instrumentation inside SLB routines causes duplicate SLB entries
to be added resulting into SLB multihit machine checks.
Disable kcov instrumentation on slb.o

Signed-off-by: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
---
Change in v2:
- Add comment as requested by Andrew
---
 arch/powerpc/mm/Makefile |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index d4d32e229ace..eb16449e694c 100644
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -60,3 +60,6 @@ obj-$(CONFIG_PPC_MEM_KEYS)	+= pkeys.o
 # This is necessary for booting with kcov enabled on book3e machines
 KCOV_INSTRUMENT_tlb_nohash.o := n
 KCOV_INSTRUMENT_fsl_booke_mmu.o := n
+
+# Disable kcov instrumentation on sensitive code for book3s_64 machines
+KCOV_INSTRUMENT_slb.o := n