perf annotate: Add the cmp_null function and make use of it

This function exists in builtin-report.c but not in
builtin-annotate.c Functions that use cmp_null are shorter and
clearer.

Synchronizing functions between these two files will also make it
easier to potential share code in the future.

Signed-off-by: John Kacur <jkacur@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <alpine.LFD.2.00.0909241754031.11383@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 1ec741615814dddfefb7ad11391e2dfa26ce8b3a..a33087328bd4609ad19d9fda4cdd82308e90e77b 100644 (file)
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -82,6 +82,16 @@ struct sort_entry {
        size_t  (*print)(FILE *fp, struct hist_entry *);
 };
 
+static int64_t cmp_null(void *l, void *r)
+{
+       if (!l && !r)
+               return 0;
+       else if (!l)
+               return -1;
+       else
+               return 1;
+}
+
 /* --sort pid */
 
 static int64_t
@@ -116,14 +126,8 @@ sort__comm_collapse(struct hist_entry *left, struct hist_entry *right)
        char *comm_l = left->thread->comm;
        char *comm_r = right->thread->comm;
 
-       if (!comm_l || !comm_r) {
-               if (!comm_l && !comm_r)
-                       return 0;
-               else if (!comm_l)
-                       return -1;
-               else
-                       return 1;
-       }
+       if (!comm_l || !comm_r)
+               return cmp_null(comm_l, comm_r);
 
        return strcmp(comm_l, comm_r);
 }
@@ -149,14 +153,8 @@ sort__dso_cmp(struct hist_entry *left, struct hist_entry *right)
        struct dso *dso_l = left->dso;
        struct dso *dso_r = right->dso;
 
-       if (!dso_l || !dso_r) {
-               if (!dso_l && !dso_r)
-                       return 0;
-               else if (!dso_l)
-                       return -1;
-               else
-                       return 1;
-       }
+       if (!dso_l || !dso_r)
+               return cmp_null(dso_l, dso_r);
 
        return strcmp(dso_l->name, dso_r->name);
 }