linux-kernel - Re: [PATCH 4/4] perf trace beauty: Always show mprotect prot even though PROT

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Message-ID: <ZiEupQ_PDlA_3Lo4@x1>
Date: Thu, 18 Apr 2024 11:31:01 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Changbin Du <changbin.du@...wei.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] perf trace beauty: Always show mprotect prot even
 though PROT_NONE

On Thu, Apr 18, 2024 at 09:13:04PM +0800, Changbin Du wrote:
> Do not omit the flags even though it is PROT_NONE.
> 
> Signed-off-by: Changbin Du <changbin.du@...wei.com>
> ---
>  tools/perf/builtin-trace.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index 349550b02f79..7f936f1b5519 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -1042,7 +1042,7 @@ static const struct syscall_fmt syscall_fmts[] = {
>  		   [4] = { .scnprintf = SCA_MOVE_MOUNT_FLAGS, /* flags */ }, }, },
>  	{ .name	    = "mprotect",
>  	  .arg = { [0] = { .scnprintf = SCA_HEX,	/* start */ },
> -		   [2] = { .scnprintf = SCA_MMAP_PROT,	/* prot */ }, }, },
> +		   [2] = { .scnprintf = SCA_MMAP_PROT, .show_zero = true, /* prot */ }, }, },


So since syscall_arg__scnprintf_mmap_prot() special cases 0 to print
NONE for prot... Ok, I'll expand a bit the commit log message _and_ the
syscall_fmts entry for mprotect.

- Arnaldo

>  	{ .name	    = "mq_unlink",
>  	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* u_name */ }, }, },
>  	{ .name	    = "mremap",	    .hexret = true,
> -- 
> 2.34.1