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>

1 files changed, 30 insertions, 26 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index bf8dd2e893e4..f2ff8609e98e 100644
--- 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)