linux-kernel - [PATCH] perf tools: Fix line number in the config file error message

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Date:	Tue, 23 Sep 2014 13:56:56 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, Milian Wolff <mail@...ianw.de>
Subject: [PATCH] perf tools: Fix line number in the config file error message

On Tue, Sep 23, 2014 at 10:01:39AM +0900, Namhyung Kim wrote:
> Hello,
> 
> This is patchset to add new callchain related config options so that
> users don't need to pass their preference to the cmdline everytime.
> 
> Following config options will be added, and users can set appropriate
> values to ~/.perfconfig file.  Note that the dump-size option is
> meaningful only if record-mode = dwarf.
> 
>   $ cat ~/.perfconfig
>   [call-graph]
>     record-mode = dwarf
>     dump-size = 4096
>     print-type = graph
>     order = callee
>     threshold = 0.5
>     print-limit = 128
>     sort-key = function
> 
>   $ perf record -vg sleep 1
>   callchain: type DWARF
>   callchain: stack dump size 4096
>   mmap size 528384B
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.054 MB perf.data (~2378 samples) ]
>   Looking at the vmlinux_path (7 entries long)
>   Using /lib/modules/3.16.3-1-ARCH/build/vmlinux for symbols
> 
> 
> Jiri and David, I kept your Acked-by and Reviewed-by in this version.
> Please take a look at the patch 4/5 which splits parser functions that
> it still looks okay to you.

looks ok to me, ACK for the patchset

During the testing I found wrong line is displayed in the parsing
error message. It's bug in the config code, attached patch should
fix it.

thanks,
jirka


---
If we fail to parse the config file within the callback function,
the line number counter 'could be' already on the next line.

This results in wrong line number report like:

  $ cat ~/.perfconfig
  [call-graph]
          sort-key = krava
  $ perf record ls
  Fatal: bad config file line 3 in /home/jolsa/.perfconfig

Fixing this by saving the current line number for this case.

Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/config.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 953512ed72ba..57ff826f150b 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -222,7 +222,8 @@ static int perf_parse_file(config_fn_t fn, void *data)
 	const unsigned char *bomptr = utf8_bom;
 
 	for (;;) {
-		int c = get_next_char();
+		int line, c = get_next_char();
+
 		if (bomptr && *bomptr) {
 			/* We are at the file beginning; skip UTF8-encoded BOM
 			 * if present. Sane editors won't put this in on their
@@ -261,8 +262,16 @@ static int perf_parse_file(config_fn_t fn, void *data)
 		if (!isalpha(c))
 			break;
 		var[baselen] = tolower(c);
-		if (get_value(fn, data, var, baselen+1) < 0)
+
+		/*
+		 * The get_value function might or might not reach the '\n',
+		 * so saving the current line number for error reporting.
+		 */
+		line = config_linenr;
+		if (get_value(fn, data, var, baselen+1) < 0) {
+			config_linenr = line;
 			break;
+		}
 	}
 	die("bad config file line %d in %s", config_linenr, config_file_name);
 }
-- 
1.8.3.1

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