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From linux-kernel-owner@vger.kernel.org Mon Jan 24 11:13:12 2011
Date: Mon, 24 Jan 2011 11:13:04 -0500
From: Kyle McMartin <kyle@mcmartin.ca>
To: mingo@redhat.com
Cc: linux-kernel@vger.kernel.org, acme@redhat.com
Subject: [PATCH] perf: fix gcc 4.6.0 issues with tools/perf
Message-ID: <20110124161304.GK27353@bombadil.infradead.org>
Hi Ingo,
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.
regards, Kyle
kyle@dreadnought:~/src% gcc --version
gcc (GCC) 4.6.0 20110122 (Red Hat 4.6.0-0.3)
---
bench/sched-pipe.c | 2 +-
builtin-sched.c | 12 +++---------
builtin-top.c | 5 +----
util/header.c | 2 +-
util/hist.c | 3 ---
util/scripting-engines/trace-event-python.c | 3 +--
util/symbol.c | 4 ++--
util/trace-event-parse.c | 2 +-
util/ui/browsers/map.c | 2 +-
9 files changed, 11 insertions(+), 24 deletions(-)
diff --git a/tools/perf/bench/sched-pipe.c b/tools/perf/bench/sched-pipe.c
index d9ab3ce..0c7454f 100644
--- a/tools/perf/bench/sched-pipe.c
+++ b/tools/perf/bench/sched-pipe.c
@@ -55,7 +55,7 @@ int bench_sched_pipe(int argc, const char **argv,
* discarding returned value of read(), write()
* causes error in building environment for perf
*/
- int ret, wait_stat;
+ int __used ret, wait_stat;
pid_t pid, retpid;
argc = parse_options(argc, argv, options,
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 29e7ffd..f9e304f 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -369,11 +369,6 @@ static void
process_sched_event(struct task_desc *this_task __used, struct sched_atom *atom)
{
int ret = 0;
- u64 now;
- long long delta;
-
- now = get_nsecs();
- delta = start_time + atom->timestamp - now;
switch (atom->type) {
case SCHED_EVENT_RUN:
@@ -562,7 +557,7 @@ static void wait_for_tasks(void)
static void run_one_test(void)
{
- u64 T0, T1, delta, avg_delta, fluct, std_dev;
+ u64 T0, T1, delta, avg_delta, fluct;
T0 = get_nsecs();
wait_for_tasks();
@@ -578,7 +573,6 @@ static void run_one_test(void)
else
fluct = delta - avg_delta;
sum_fluct += fluct;
- std_dev = sum_fluct / nr_runs / sqrt(nr_runs);
if (!run_avg)
run_avg = delta;
run_avg = (run_avg*9 + delta)/10;
@@ -799,7 +793,7 @@ replay_switch_event(struct trace_switch_event *switch_event,
u64 timestamp,
struct thread *thread __used)
{
- struct task_desc *prev, *next;
+ struct task_desc *prev, __used *next;
u64 timestamp0;
s64 delta;
@@ -1404,7 +1398,7 @@ map_switch_event(struct trace_switch_event *switch_event,
u64 timestamp,
struct thread *thread __used)
{
- struct thread *sched_out, *sched_in;
+ struct thread *sched_out __used, *sched_in;
int new_shortname;
u64 timestamp0;
s64 delta;
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 05344c6..373cfc0 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -182,7 +182,6 @@ static int parse_source(struct sym_entry *syme)
FILE *file;
char command[PATH_MAX*2];
const char *path;
- u64 len;
if (!syme)
return -1;
@@ -211,8 +210,6 @@ static int parse_source(struct sym_entry *syme)
}
path = map->dso->long_name;
- len = sym->end - sym->start;
-
sprintf(command,
"objdump --start-address=%#0*" PRIx64 " --stop-address=%#0*" PRIx64 " -dS %s",
BITS_PER_LONG / 4, map__rip_2objdump(map, sym->start),
@@ -1295,7 +1292,7 @@ static int __cmd_top(void)
{
pthread_t thread;
struct perf_evsel *counter;
- int i, ret;
+ int i, ret __used;
/*
* FIXME: perf_session__new should allow passing a O_MMAP, so that all this
* mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 989fa2d..c0e5019 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1139,7 +1139,7 @@ int event__synthesize_tracing_data(int fd, struct list_head *pattrs,
{
event_t ev;
ssize_t size = 0, aligned_size = 0, padding;
- int err = 0;
+ int err __used = 0;
memset(&ev, 0, sizeof(ev));
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index c749ba6..a01a33d 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1091,7 +1091,6 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head,
char command[PATH_MAX * 2];
FILE *file;
int err = 0;
- u64 len;
char symfs_filename[PATH_MAX];
if (filename) {
@@ -1136,8 +1135,6 @@ 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);
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index c6d9933..2040b85 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -248,8 +248,7 @@ static void python_process_event(int cpu, void *data,
context = PyCObject_FromVoidPtr(scripting_context, NULL);
PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
- PyTuple_SetItem(t, n++,
- PyCObject_FromVoidPtr(scripting_context, NULL));
+ PyTuple_SetItem(t, n++, context);
if (handler) {
PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 15ccfba..52e82cf 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1517,8 +1517,8 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
symbol_conf.symfs, self->long_name);
break;
case DSO__ORIG_GUEST_KMODULE:
- if (map->groups && map->groups->machine)
- root_dir = map->groups->machine->root_dir;
+ if (map->groups && machine)
+ root_dir = machine->root_dir;
else
root_dir = "";
snprintf(name, size, "%s%s%s", symbol_conf.symfs,
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 73a0222..d8e622d 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -153,7 +153,7 @@ void parse_proc_kallsyms(char *file, unsigned int size __unused)
char *next = NULL;
char *addr_str;
char ch;
- int ret;
+ int ret __used;
int i;
line = strtok_r(file, "\n", &next);
diff --git a/tools/perf/util/ui/browsers/map.c b/tools/perf/util/ui/browsers/map.c
index e35437d..3788cad 100644
--- a/tools/perf/util/ui/browsers/map.c
+++ b/tools/perf/util/ui/browsers/map.c
@@ -40,7 +40,7 @@ static int ui_entry__read(const char *title, char *bf, size_t size, int width)
out_free_form:
newtPopWindow();
newtFormDestroy(form);
- return 0;
+ return err;
}
struct map_browser {
--
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