perf tool: Fix gcc 4.6.0 issues

GCC 4.6.0 in Fedora rawhide turned up some compile errors in tools/perf
due to the -Werror=unused-but-set-variable flag.

I've gone through and annotated some of the assignments that had side
effects (ie: return value from a function) with the __used annotation,
and in some cases, just removed unused code.

In a few cases, we were assigning something useful, but not using it in
later parts of the function.

kyle@dreadnought:~/src% gcc --version
gcc (GCC) 4.6.0 20110122 (Red Hat 4.6.0-0.3)

Cc: Ingo Molnar <mingo@redhat.com>
LKML-Reference: <20110124161304.GK27353@bombadil.infradead.org>
Signed-off-by: Kyle McMartin <kyle@redhat.com>
[ committer note: Fixed up the annotation fixes, as that code moved recently ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 297337649c21..1012841835a3 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -236,7 +236,6 @@ int symbol__annotate(struct symbol *sym, struct map *map,
         char command[PATH_MAX * 2];
         FILE *file;
         int err = 0;
-        u64 len;
         char symfs_filename[PATH_MAX];
 
         if (filename) {
@@ -281,8 +280,6 @@ fallback:
                  filename, sym->name, map->unmap_ip(map, sym->start),
                  map->unmap_ip(map, sym->end));
 
-        len = sym->end - sym->start;
-
         pr_debug("annotating [%p] %30s : [%p] %30s\n",
                  dso, dso->long_name, sym, sym->name);