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Date: Tue, 26 May 2015 17:48:27 +0200
From: Martin Liška <mliska@...e.cz>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
CC: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
Ingo Molnar <mingo@...hat.com>,
Paul Mackerras <paulus@...ba.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] perf: fix wrong DEBUG configuration
On 05/26/2015 04:36 PM, Arnaldo Carvalho de Melo wrote:
> Em Tue, May 26, 2015 at 11:13:32AM +0200, Martin Liška escreveu:
>> On 05/25/2015 08:32 PM, Ingo Molnar wrote:
>>>
>>> * Arnaldo Carvalho de Melo <acme@...nel.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@...e.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, but how did you generated the two attached patches?
>
> [acme@...andy linux]$ git am /wb/0001-perf-Fix-compiler-warnings.patch
> Patch format detection failed.
>
> So I'll fix it up manually, next time please try:
>
> git format-patch -n HEAD^^..
>
> Or equivalent,
>
> - Arnaldo
Hi.
That's quite strange, I've just rebuilt my branch to perf/perf/core and
I was given equal patches for:
'git format-patch -2'
Maybe that's related to erased patch header(From, Date, Subject).
Thanks for re-application,
Martin
>
>
>
>> Thanks,
>> Martin
>
>> Assign default value for pointers that are identified by the compiler as
>> non-initialized.
>>
>> Signed-off-by: Martin Liska <mliska@...e.cz>
>> Acked-by: Ingo Molnar <mingo@...nel.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@...e.cz>
>> Acked-by: Ingo Molnar <mingo@...nel.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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