powerpc/pseries: Hypervisor call tracepoints hcall_stats touchup

The tb_total and purr_total values reported via the hcall_stats code
should be cumulative, rather than being replaced by the latest delta tb
or purr value.

Tested-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Signed-off-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Acked-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/pseries/hvCall_inst.c b/arch/powerpc/platforms/pseries/hvCall_inst.c
index 2f58c71b725..1fefae76e29 100644
--- a/arch/powerpc/platforms/pseries/hvCall_inst.c
+++ b/arch/powerpc/platforms/pseries/hvCall_inst.c
@@ -124,8 +124,8 @@ static void probe_hcall_exit(unsigned long opcode, unsigned long retval,
 
         h = &__get_cpu_var(hcall_stats)[opcode / 4];
         h->num_calls++;
-        h->tb_total = mftb() - h->tb_start;
-        h->purr_total = mfspr(SPRN_PURR) - h->purr_start;
+        h->tb_total += mftb() - h->tb_start;
+        h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
 
         put_cpu_var(hcall_stats);
 }