From 508c4d0874acf8584787bbab7e4a3798e2834c1a Mon Sep 17 00:00:00 2001 From: Mike Galbraith Date: Wed, 23 Sep 2009 11:20:58 +0200 Subject: [PATCH] perf tools: Fix module symbol loading bug Avi Kivity reported 'perf annotate' failures with modules, the requested function was not annotated. If there are no modules currently loaded, or the last module scanned is not loaded, dso__load_modules() steps on the value from dso__load_vmlinux(), so we happily load the kallsyms symbols on top of what we've already loaded. Fix that such that the total count of symbols loaded is returned. Should module symbol load fail after parsing of vmlinux, is's a hard failure, so do not silently fall-back to kallsyms. Reported-by: Avi Kivity Signed-off-by: Mike Galbraith Cc: Arnaldo Carvalho de Melo Cc: rostedt@goodmis.org Cc: Mathieu Desnoyers Cc: Peter Zijlstra Cc: Frederic Weisbecker Cc: Masami Hiramatsu LKML-Reference: <1253697658.11461.36.camel@marge.simson.net> Signed-off-by: Ingo Molnar --- tools/perf/util/symbol.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index fd3d9c8e90f..559fb06210f 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -833,7 +833,7 @@ int dso__load_modules(struct dso *self, symbol_filter_t filter, int v) struct mod_dso *mods = mod_dso__new_dso("modules"); struct module *pos; struct rb_node *next; - int err; + int err, count = 0; err = mod_dso__load_modules(mods); @@ -852,14 +852,16 @@ int dso__load_modules(struct dso *self, symbol_filter_t filter, int v) break; next = rb_next(&pos->rb_node); + count += err; } if (err < 0) { mod_dso__delete_modules(mods); mod_dso__delete_self(mods); + return err; } - return err; + return count; } static inline void dso__fill_symbol_holes(struct dso *self) @@ -913,8 +915,15 @@ int dso__load_kernel(struct dso *self, const char *vmlinux, if (vmlinux) { err = dso__load_vmlinux(self, vmlinux, filter, v); - if (err > 0 && use_modules) - err = dso__load_modules(self, filter, v); + if (err > 0 && use_modules) { + int syms = dso__load_modules(self, filter, v); + + if (syms < 0) { + fprintf(stderr, "dso__load_modules failed!\n"); + return syms; + } + err += syms; + } } if (err <= 0)