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Subject[PATCH 02/14] perf probe: Fix 'function unused' warning
Date
From: Wang Nan <wangnan0@huawei.com>

By 'make build-test' a warning is found in probe-event.c that, after
commit 419e873828 (perf probe: Show the error reason comes from
invalid DSO) the only user of kernel_get_module_dso() is
open_debuginfo(). Which is not compiled if HAVE_DWARF_SUPPORT not set.

'make build-test' found this problem when make_minimal.

This patch moves kernel_get_module_dso() to HAVE_DWARF_SUPPORT ifdef
section.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1432779905-206143-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/probe-event.c | 65 ++++++++++++++++++++++---------------------
1 file changed, 33 insertions(+), 32 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b0b8a8080009..e6a02b1ffd6d 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -200,38 +200,6 @@ static void put_target_map(struct map *map, bool user)
}


-static int kernel_get_module_dso(const char *module, struct dso **pdso)
-{
- struct dso *dso;
- struct map *map;
- const char *vmlinux_name;
- int ret = 0;
-
- if (module) {
- list_for_each_entry(dso, &host_machine->kernel_dsos.head,
- node) {
- if (strncmp(dso->short_name + 1, module,
- dso->short_name_len - 2) == 0)
- goto found;
- }
- pr_debug("Failed to find module %s.\n", module);
- return -ENOENT;
- }
-
- map = host_machine->vmlinux_maps[MAP__FUNCTION];
- dso = map->dso;
-
- vmlinux_name = symbol_conf.vmlinux_name;
- dso->load_errno = 0;
- if (vmlinux_name)
- ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL);
- else
- ret = dso__load_vmlinux_path(dso, map, NULL);
-found:
- *pdso = dso;
- return ret;
-}
-
static int convert_exec_to_group(const char *exec, char **result)
{
char *ptr1, *ptr2, *exec_copy;
@@ -279,6 +247,39 @@ static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
}

#ifdef HAVE_DWARF_SUPPORT
+
+static int kernel_get_module_dso(const char *module, struct dso **pdso)
+{
+ struct dso *dso;
+ struct map *map;
+ const char *vmlinux_name;
+ int ret = 0;
+
+ if (module) {
+ list_for_each_entry(dso, &host_machine->kernel_dsos.head,
+ node) {
+ if (strncmp(dso->short_name + 1, module,
+ dso->short_name_len - 2) == 0)
+ goto found;
+ }
+ pr_debug("Failed to find module %s.\n", module);
+ return -ENOENT;
+ }
+
+ map = host_machine->vmlinux_maps[MAP__FUNCTION];
+ dso = map->dso;
+
+ vmlinux_name = symbol_conf.vmlinux_name;
+ dso->load_errno = 0;
+ if (vmlinux_name)
+ ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL);
+ else
+ ret = dso__load_vmlinux_path(dso, map, NULL);
+found:
+ *pdso = dso;
+ return ret;
+}
+
/*
* Some binaries like glibc have special symbols which are on the symbol
* table, but not in the debuginfo. If we can find the address of the
--
2.1.0


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