Messages in this thread Patches in this message | | | Date | Tue, 26 May 2015 11:13:32 +0200 | From | Martin Liška <> | Subject | Re: [PATCH] perf: fix wrong DEBUG configuration |
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On 05/25/2015 08:32 PM, Ingo Molnar wrote: > > * Arnaldo Carvalho de Melo <acme@kernel.org> wrote: > >> Em Mon, May 25, 2015 at 01:12:44PM +0200, Martin Liška escreveu: >>> On 05/25/2015 01:09 PM, Ingo Molnar wrote: >>>> >>>> * Martin Liška <mliska@suse.cz> wrote: >>>> >>>>>>> Right optimize debugging experience is given by passing -Og to >>>>>>> compiler. Assign default value for pointers that are identified by >>>>>>> compiler as non-initialized. >>>>>> >>>>>> s/Right optimize debugging experience is given/ >>>>>> Correct debugging experience is given/ >>>> >>>>> Right debugging experience is given by passing -Og to compiler. >>>> >>>> So I fixed the spelling here once already :-/ If you want to use >>>> 'right' in this context then use it like this: >>>> >>>> The right debugging experience is given by ... >>>> >>>> Or you can use what I suggested first: >>>> >>>> Correct debugging experience is given by ... >>>> >>>> Thanks, >>>> >>>> Ingo >>>> >>> >>> Sorry Ingo for that, I overlooked that correction :) >> >> Are you ok with this Ingo? > > Yeah, certainly! > >> I can apply, but there seems to be two patches folded here, one that >> sets the possibly unitiliazed variables to NULL, and could be the >> first in the series, and the other, that deals with multiple >> versions of gcc and how should we ask something from them. > > Yeah. > > Thanks, > > Ingo >
Hello.
As Arnaldo pointed, I split the patch to following 2 smaller patches.
Thanks, Martin Assign default value for pointers that are identified by the compiler as non-initialized.
Signed-off-by: Martin Liska <mliska@suse.cz> Acked-by: Ingo Molnar <mingo@kernel.org> --- tools/perf/arch/common.c | 2 +- tools/perf/util/symbol.c | 2 +- tools/perf/util/trace-event-parse.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/perf/arch/common.c b/tools/perf/arch/common.c index 49776f1..b7bb42c 100644 --- a/tools/perf/arch/common.c +++ b/tools/perf/arch/common.c @@ -61,7 +61,7 @@ const char *const mips_triplets[] = { static bool lookup_path(char *name) { bool found = false; - char *path, *tmp; + char *path, *tmp = NULL; char buf[PATH_MAX]; char *env = getenv("PATH"); diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 82a31fd..a19fbd4 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -400,7 +400,7 @@ static struct symbol *symbols__find_by_name(struct rb_root *symbols, const char *name) { struct rb_node *n; - struct symbol_name_rb_node *s; + struct symbol_name_rb_node *s = NULL; if (symbols == NULL) return NULL; diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c index 25d6c73..d495741 100644 --- a/tools/perf/util/trace-event-parse.c +++ b/tools/perf/util/trace-event-parse.c @@ -173,7 +173,7 @@ void parse_ftrace_printk(struct pevent *pevent, char *line; char *next = NULL; char *addr_str; - char *fmt; + char *fmt = NULL; line = strtok_r(file, "\n", &next); while (line) { -- 2.1.4 Currently, GCC optimizes -O6 same as -O3 level, thus change the value to -O3. Correct debugging experience is given by passing -Og to compiler.
Signed-off-by: Martin Liska <mliska@suse.cz> Acked-by: Ingo Molnar <mingo@kernel.org> --- tools/perf/config/Makefile | 4 +++- tools/perf/config/utilities.mak | 19 +++++++++++++++++++ 2 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile index e3b3724..47e4ae1 100644 --- a/tools/perf/config/Makefile +++ b/tools/perf/config/Makefile @@ -129,7 +129,9 @@ ifndef DEBUG endif ifeq ($(DEBUG),0) - CFLAGS += -O6 + CFLAGS += -O3 +else + CFLAGS += $(call cc-option,-Og,-O0) endif ifdef PARSER_DEBUG diff --git a/tools/perf/config/utilities.mak b/tools/perf/config/utilities.mak index c16ce83..0ebef09 100644 --- a/tools/perf/config/utilities.mak +++ b/tools/perf/config/utilities.mak @@ -177,3 +177,22 @@ $(if $($(1)),$(call _ge_attempt,$($(1)),$(1)),$(call _ge_attempt,$(2))) endef _ge_attempt = $(if $(get-executable),$(get-executable),$(call _gea_err,$(2))) _gea_err = $(if $(1),$(error Please set '$(1)' appropriately)) + +# try-run +# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) +# Exit code chooses option. "$$TMP" is can be used as temporary file and +# is automatically cleaned up. +try-run = $(shell set -e; \ + TMP="$(TMPOUT).$$$$.tmp"; \ + TMPO="$(TMPOUT).$$$$.o"; \ + if ($(1)) >/dev/null 2>&1; \ + then echo "$(2)"; \ + else echo "$(3)"; \ + fi; \ + rm -f "$$TMP" "$$TMPO") + +# cc-option +# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) + +cc-option = $(call try-run,\ + $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) -- 2.1.4
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