[PATCH] perf tools: Fix kernel maps for kcore and eBPF

[Adrian Hunter]

Adjust pgoff also when moving a map's start address.

Example with v5.4.34 based kernel:

  Before:

    $ sudo tools/perf/perf record -a --kcore -e intel_pt//k sleep 1
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 1.958 MB perf.data ]
    $ sudo tools/perf/perf script --itrace=e >/dev/null
    Warning:
    961 instruction trace errors

  After:

    $ sudo tools/perf/perf script --itrace=e >/dev/null
    $

Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
Fixes: fb5a88d4131a ("perf tools: Preserve eBPF maps when loading kcore")
Cc: sta...@vger.kernel.org
---
 tools/perf/util/symbol.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 57cbe7a29868..5ddf84dcbae7 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1224,6 +1224,7 @@ int maps__merge_in(struct maps *kmaps, struct map 
*new_map)
 
                                m->end = old_map->start;
                                list_add_tail(&m->node, &merged);
+                               new_map->pgoff += old_map->end - new_map->start;
                                new_map->start = old_map->end;
                        }
                } else {
@@ -1244,6 +1245,7 @@ int maps__merge_in(struct maps *kmaps, struct map 
*new_map)
                                 *      |new......| ->         |new...|
                                 * |old....|        -> |old....|
                                 */
+                               new_map->pgoff += old_map->end - new_map->start;
                                new_map->start = old_map->end;
                        }
                }
-- 
2.17.1