1 files changed, 23 insertions, 0 deletions

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 37f8dc557ec0..e00daf0d2bde 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -32,6 +32,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
         machine->symbol_filter = NULL;
         machine->id_hdr_size = 0;
         machine->comm_exec = false;
+        machine->kernel_start = 0;
 
         machine->root_dir = strdup(root_dir);
         if (machine->root_dir == NULL)
@@ -1559,3 +1560,25 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
 
         return 0;
 }
+
+int machine__get_kernel_start(struct machine *machine)
+{
+        struct map *map = machine__kernel_map(machine, MAP__FUNCTION);
+        int err = 0;
+
+        /*
+         * The only addresses above 2^63 are kernel addresses of a 64-bit
+         * kernel.  Note that addresses are unsigned so that on a 32-bit system
+         * all addresses including kernel addresses are less than 2^32.  In
+         * that case (32-bit system), if the kernel mapping is unknown, all
+         * addresses will be assumed to be in user space - see
+         * machine__kernel_ip().
+         */
+        machine->kernel_start = 1ULL << 63;
+        if (map) {
+                err = map__load(map, machine->symbol_filter);
+                if (map->start)
+                        machine->kernel_start = map->start;
+        }
+        return err;
+}