[PATCH v2 04/14] perf kvm: Use subtraction for comparison metrics

[Leo Yan <leo.yan@linaro.org>]

Currently the metrics comparison uses greater operator (>), it returns
the boolean value (0 or 1).

This patch changes to use subtraction as comparison result, which can
be used by histograms sorting.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
 tools/perf/builtin-kvm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 62c097a37da9..6eec0db2dda6 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -66,7 +66,7 @@ GET_EVENT_KEY(func, field)						\
 static int cmp_event_ ## func(struct kvm_event *one,			\
 			      struct kvm_event *two, int vcpu)		\
 {									\
-	return get_event_ ##func(one, vcpu) >				\
+	return get_event_ ##func(one, vcpu) -				\
 	       get_event_ ##func(two, vcpu);				\
 }
 
@@ -523,7 +523,7 @@ static void insert_to_result(struct rb_root *result, struct kvm_event *event,
 		p = container_of(*rb, struct kvm_event, rb);
 		parent = *rb;
 
-		if (bigger(event, p, vcpu))
+		if (bigger(event, p, vcpu) > 0)
 			rb = &(*rb)->rb_left;
 		else
 			rb = &(*rb)->rb_right;
-- 
2.34.1