perf report: Move logic to warn about kptr_restrict'ed kernels to separate function

Its too big, better have a separate function for it so that the main
logic gets shorter/clearer.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-ahh6vfzyh8fsygjwrsbroeu0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index bf8dd2e..f2ff860 100644 (file)
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -412,14 +412,41 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
        return 0;
 }
 
+static void report__warn_kptr_restrict(const struct report *rep)
+{
+       struct map *kernel_map = rep->session->machines.host.vmlinux_maps[MAP__FUNCTION];
+       struct kmap *kernel_kmap = map__kmap(kernel_map);
+
+       if (kernel_map == NULL ||
+           (kernel_map->dso->hit &&
+            (kernel_kmap->ref_reloc_sym == NULL ||
+             kernel_kmap->ref_reloc_sym->addr == 0))) {
+               const char *desc =
+                   "As no suitable kallsyms nor vmlinux was found, kernel samples\n"
+                   "can't be resolved.";
+
+               if (kernel_map) {
+                       const struct dso *kdso = kernel_map->dso;
+                       if (!RB_EMPTY_ROOT(&kdso->symbols[MAP__FUNCTION])) {
+                               desc = "If some relocation was applied (e.g. "
+                                      "kexec) symbols may be misresolved.";
+                       }
+               }
+
+               ui__warning(
+"Kernel address maps (/proc/{kallsyms,modules}) were restricted.\n\n"
+"Check /proc/sys/kernel/kptr_restrict before running 'perf record'.\n\n%s\n\n"
+"Samples in kernel modules can't be resolved as well.\n\n",
+               desc);
+       }
+}
+
 static int __cmd_report(struct report *rep)
 {
        int ret = -EINVAL;
        u64 nr_samples;
        struct perf_session *session = rep->session;
        struct perf_evsel *pos;
-       struct map *kernel_map;
-       struct kmap *kernel_kmap;
        const char *help = "For a higher level overview, try: perf report --sort comm,dso";
        struct ui_progress prog;
        struct perf_data_file *file = session->file;
@@ -444,30 +471,7 @@ static int __cmd_report(struct report *rep)
        if (ret)
                return ret;
 
-       kernel_map = session->machines.host.vmlinux_maps[MAP__FUNCTION];
-       kernel_kmap = map__kmap(kernel_map);
-       if (kernel_map == NULL ||
-           (kernel_map->dso->hit &&
-            (kernel_kmap->ref_reloc_sym == NULL ||
-             kernel_kmap->ref_reloc_sym->addr == 0))) {
-               const char *desc =
-                   "As no suitable kallsyms nor vmlinux was found, kernel samples\n"
-                   "can't be resolved.";
-
-               if (kernel_map) {
-                       const struct dso *kdso = kernel_map->dso;
-                       if (!RB_EMPTY_ROOT(&kdso->symbols[MAP__FUNCTION])) {
-                               desc = "If some relocation was applied (e.g. "
-                                      "kexec) symbols may be misresolved.";
-                       }
-               }
-
-               ui__warning(
-"Kernel address maps (/proc/{kallsyms,modules}) were restricted.\n\n"
-"Check /proc/sys/kernel/kptr_restrict before running 'perf record'.\n\n%s\n\n"
-"Samples in kernel modules can't be resolved as well.\n\n",
-               desc);
-       }
+       report__warn_kptr_restrict(rep);
 
        if (use_browser == 0) {
                if (verbose > 3)