linux-kernel - Re: [PATCH] Fixes issue when debugging debug builds of Perf.

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Date:   Wed, 30 Oct 2019 11:03:43 +0000
From:   James Clark <James.Clark@....com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
CC:     "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nd <nd@....com>, Adrian Hunter <adrian.hunter@...el.com>,
        Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH] Fixes issue when debugging debug builds of Perf.

Hi Arnaldo,

Thanks for that, yes separating them looks better.
I will try to break down commits in the future.

> The patch came mangled, so I'm applying by hand, and separating it into
> two patches, the first for the first paragraph and the other for the
> second, ok?

By mangled do you mean the quoted printables "=3D" and "=20"?

It seems like git send-email falls back to this behavior by default:

         
     --transfer-encoding=(7bit|8bit|quoted-printable|base64|auto)

       Specify the transfer encoding to be used to send the message over SMTP.
       7bit will fail upon encountering a non-ASCII message. quoted-printable can be
       useful when the repository contains files that contain carriage returns, but
       makes the raw patch email file (as saved from a MUA) much harder to inspect
       manually. base64 is even more fool proof, but also even more opaque. auto will
       use 8bit when possible, and quoted-printable otherwise.


I copied my raw patch and was able to successfully apply it with git am, even with this escaping. Although I
did upgrade to a newer version of git (2.23.0).

If I view the patch that you created, then it doesn't have quoted printable escaping. So there does
seem to be a difference somewhere.
Do you think I should use "git send-email --transfer-encoding=7bit"?


Thanks
James

On 29/10/2019 14:26, Arnaldo Carvalho de Melo wrote:
> Em Tue, Oct 29, 2019 at 11:18:52AM -0300, Arnaldo Carvalho de Melo escreveu:
>> And here is the first patch out of your larger one, I changed the
>> subject line to reflect that this is not tools/perf specific, as
>> tools/objtool/ also uses libsubcmd, added Josh, objtool's maintainer so
>> that he is made aware.
> 
> And the second patch:
> 
> 
> commit d0381449fd9ab733ec2daf527263da9f73f1e94e
> Author: James Clark <James.Clark@....com>
> Date:   Mon Oct 28 11:34:01 2019 +0000
> 
>     libsubcmd: Use -O0 with DEBUG=1
>     
>     When a 'make DEBUG=1' build is done, the command parser is still built
>     with -O6 and is hard to step through, fix it making it use -O0 in that
>     case.
>     
>     Signed-off-by: James Clark <james.clark@....com>
>     Cc: Adrian Hunter <adrian.hunter@...el.com>
>     Cc: Ian Rogers <irogers@...gle.com>
>     Cc: Jiri Olsa <jolsa@...nel.org>
>     Cc: Josh Poimboeuf <jpoimboe@...hat.com>
>     Cc: Namhyung Kim <namhyung@...nel.org>
>     Cc: nd <nd@....com>
>     Link: http://lore.kernel.org/lkml/20191028113340.4282-1-james.clark@arm.com
>     [ split from a larger patch ]
>     Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile
> index 352c6062deba..1c777a72bb39 100644
> --- a/tools/lib/subcmd/Makefile
> +++ b/tools/lib/subcmd/Makefile
> @@ -27,7 +27,9 @@ ifeq ($(DEBUG),0)
>    endif
>  endif
>  
> -ifeq ($(CC_NO_CLANG), 0)
> +ifeq ($(DEBUG),1)
> +  CFLAGS += -O0
> +else ifeq ($(CC_NO_CLANG), 0)
>    CFLAGS += -O3
>  else
>    CFLAGS += -O6
>