[sysprof/sysprof-3-26] kernel: only try to load kernel symbol map once

[Christian Hergert <chergert src gnome org>]

commit 37982a255173d25ffa857e387cc93454d13a72b8
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jan 27 01:09:56 2018 -0800

    kernel: only try to load kernel symbol map once
    
    If we fail, log a message to the console and bail. This seems to happen
    with recent kernel changes.

 lib/sp-kernel-symbol.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/lib/sp-kernel-symbol.c b/lib/sp-kernel-symbol.c
index 3a3d9c9..d9e7975 100644
--- a/lib/sp-kernel-symbol.c
+++ b/lib/sp-kernel-symbol.c
@@ -186,8 +186,17 @@ sp_kernel_symbol_from_address (SpCaptureAddress address)
 
   if (G_UNLIKELY (kernel_symbols == NULL))
     {
-      if (!sp_kernel_symbol_load ())
+      static gboolean failed;
+
+      if (failed)
         return NULL;
+
+      if (!sp_kernel_symbol_load ())
+        {
+          g_warning ("Failed to load kernel symbol map, kernel symbols will not be available!");
+          failed = TRUE;
+          return NULL;
+        }
     }
 
   g_assert (kernel_symbols != NULL);