This is a note to let you know that I've just added the patch titled perf kcore_copy: Fix module map when there are no modules loaded to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: perf-kcore_copy-fix-module-map-when-there-are-no-mod.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a10271528b68db9e4c8c9f5425ee5dd56c5049df Author: Adrian Hunter <adrian.hunter@xxxxxxxxx> Date: Tue May 12 15:19:16 2020 +0300 perf kcore_copy: Fix module map when there are no modules loaded [ Upstream commit 61f82e3fb697a8e85f22fdec786528af73dc36d1 ] In the absence of any modules, no "modules" map is created, but there are other executable pages to map, due to eBPF JIT, kprobe or ftrace. Map them by recognizing that the first "module" symbol is not necessarily from a module, and adjust the map accordingly. Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Leo Yan <leo.yan@xxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> Cc: x86@xxxxxxxxxx Link: http://lore.kernel.org/lkml/20200512121922.8997-10-adrian.hunter@xxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index a701a8a48f005..166c621e02235 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -1421,6 +1421,7 @@ struct kcore_copy_info { u64 first_symbol; u64 last_symbol; u64 first_module; + u64 first_module_symbol; u64 last_module_symbol; size_t phnum; struct list_head phdrs; @@ -1497,6 +1498,8 @@ static int kcore_copy__process_kallsyms(void *arg, const char *name, char type, return 0; if (strchr(name, '[')) { + if (!kci->first_module_symbol || start < kci->first_module_symbol) + kci->first_module_symbol = start; if (start > kci->last_module_symbol) kci->last_module_symbol = start; return 0; @@ -1694,6 +1697,10 @@ static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir, kci->etext += page_size; } + if (kci->first_module_symbol && + (!kci->first_module || kci->first_module_symbol < kci->first_module)) + kci->first_module = kci->first_module_symbol; + kci->first_module = round_down(kci->first_module, page_size); if (kci->last_module_symbol) {