From 6ec9503f45740b6ae4cb7f3e7441b1539c6d51d6 Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Tue, 13 Jun 2023 11:26:29 -0700 Subject: [PATCH] perf parse-events: Avoid string for PE_BP_COLON, PE_BP_SLASH There's no need to read the string ':' or '/' for PE_BP_COLON or PE_BP_SLASH and doing so causes parse-events.y to leak memory. The original patch has a committer note about not using these tokens presumably as yacc spotted they were a memory leak because no %destructor could be run. Remove the unused token workaround as there is now no value associated with these tokens. Fixes: f0617f526cb0c482 ("perf parse: Allow config terms with breakpoints") Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Rob Herring Link: https://lore.kernel.org/r/20230613182629.1500317-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/parse-events.h | 4 ---- tools/perf/util/parse-events.l | 4 ++-- tools/perf/util/parse-events.y | 9 --------- 3 files changed, 2 insertions(+), 15 deletions(-) diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 5fdc1f33f57e..b0eb95f93e9c 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -228,10 +228,6 @@ void parse_events_error__handle(struct parse_events_error *err, int idx, void parse_events_error__print(struct parse_events_error *err, const char *event); -static inline void parse_events_unused_value(const void *x __maybe_unused) -{ -} - #ifdef HAVE_LIBELF_SUPPORT /* * If the probe point starts with '%', diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index 7629af3d5c7c..99335ec586ae 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -315,13 +315,13 @@ r0x{num_raw_hex} { return str(yyscanner, PE_RAW); } * are the same, so trailing context can be used disambiguate the two * cases. */ -":"/{modifier_bp} { return str(yyscanner, PE_BP_COLON); } +":"/{modifier_bp} { return PE_BP_COLON; } /* * The slash before memory length can get mixed up with the slash before * config terms. Fortunately config terms do not start with a numeric * digit, so trailing context can be used disambiguate the two cases. */ -"/"/{digit} { return str(yyscanner, PE_BP_SLASH); } +"/"/{digit} { return PE_BP_SLASH; } "/"/{non_digit} { BEGIN(config); return '/'; } {num_dec} { return value(yyscanner, 10); } {num_hex} { return value(yyscanner, 16); } diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 0c3d086cc22a..9f28d4b5502f 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -80,8 +80,6 @@ static void free_list_evsel(struct list_head* list_evsel) %type PE_LEGACY_CACHE %type PE_MODIFIER_EVENT %type PE_MODIFIER_BP -%type PE_BP_COLON -%type PE_BP_SLASH %type PE_EVENT_NAME %type PE_KERNEL_PMU_EVENT PE_PMU_EVENT_FAKE %type PE_DRV_CFG_TERM @@ -510,9 +508,6 @@ PE_PREFIX_MEM PE_VALUE PE_BP_SLASH PE_VALUE PE_BP_COLON PE_MODIFIER_BP opt_event struct list_head *list; int err; - parse_events_unused_value(&$3); - parse_events_unused_value(&$5); - list = alloc_list(); ABORT_ON(!list); err = parse_events_add_breakpoint(_parse_state, list, @@ -531,8 +526,6 @@ PE_PREFIX_MEM PE_VALUE PE_BP_SLASH PE_VALUE opt_event_config struct list_head *list; int err; - parse_events_unused_value(&$3); - list = alloc_list(); ABORT_ON(!list); err = parse_events_add_breakpoint(_parse_state, list, @@ -550,8 +543,6 @@ PE_PREFIX_MEM PE_VALUE PE_BP_COLON PE_MODIFIER_BP opt_event_config struct list_head *list; int err; - parse_events_unused_value(&$3); - list = alloc_list(); ABORT_ON(!list); err = parse_events_add_breakpoint(_parse_state, list,