linux-kernel - Re: [PATCH 1/2] perf tools: Ensure --symfs ends with '/'

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Message-ID: <20140729123305.GO7831@kernel.org>
Date:	Tue, 29 Jul 2014 09:33:05 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Namhyung Kim <namhyung@...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>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 1/2] perf tools: Ensure --symfs ends with '/'

Em Tue, Jul 29, 2014 at 02:02:46PM +0900, Minchan Kim escreveu:
> On Fri, Jul 25, 2014 at 10:31:47AM +0900, Namhyung Kim wrote:
> > Minchan reported that perf failed to load vmlinux if --symfs argument
> > doesn't end with '/' character.  So make sure that the symfs always
> > ends with the '/'.
> > 
> > Reported-by: Minchan Kim <minchan@...nel.org>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> 
> Both patches work and are handy to me.
> Thanks Namhyung.

I haven't said it is not :-) Just that it should be fixed in a different
way.

Can you please try the patch below instead?

David, was there any reason not to do it like done in this patch?

- Arnaldo

---
 annotate.c |    4 ++--
 dso.c      |    8 ++++----
 symbol.c   |    2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 809b4c50beae..e67ef4a2b356 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -900,7 +900,7 @@ int symbol__annotate(struct symbol *sym, struct map *map, size_t privsize)
 	bool delete_extract = false;
 
 	if (filename) {
-		snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
+		snprintf(symfs_filename, sizeof(symfs_filename), "%s/%s",
 			 symbol_conf.symfs, filename);
 	}
 
@@ -922,7 +922,7 @@ fallback:
 		 * DSO is the same as when 'perf record' ran.
 		 */
 		filename = (char *)dso->long_name;
-		snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
+		snprintf(symfs_filename, sizeof(symfs_filename), "%s/%s",
 			 symbol_conf.symfs, filename);
 		free_filename = false;
 	}
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 90d02c661dd4..f81550583429 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -79,7 +79,7 @@ int dso__read_binary_type_filename(const struct dso *dso,
 		while (last_slash != dso->long_name && *last_slash != '/')
 			last_slash--;
 
-		len = scnprintf(filename, size, "%s", symbol_conf.symfs);
+		len = scnprintf(filename, size, "%s/", symbol_conf.symfs);
 		dir_size = last_slash - dso->long_name + 2;
 		if (dir_size > (size - len)) {
 			ret = -1;
@@ -108,17 +108,17 @@ int dso__read_binary_type_filename(const struct dso *dso,
 	case DSO_BINARY_TYPE__VMLINUX:
 	case DSO_BINARY_TYPE__GUEST_VMLINUX:
 	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
-		snprintf(filename, size, "%s%s",
+		snprintf(filename, size, "%s/%s",
 			 symbol_conf.symfs, dso->long_name);
 		break;
 
 	case DSO_BINARY_TYPE__GUEST_KMODULE:
-		snprintf(filename, size, "%s%s%s", symbol_conf.symfs,
+		snprintf(filename, size, "%s/%s/%s", symbol_conf.symfs,
 			 root_dir, dso->long_name);
 		break;
 
 	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
-		snprintf(filename, size, "%s%s", symbol_conf.symfs,
+		snprintf(filename, size, "%s/%s", symbol_conf.symfs,
 			 dso->long_name);
 		break;
 
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index eb06746b06b2..c3549d5955ea 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1468,7 +1468,7 @@ int dso__load_vmlinux(struct dso *dso, struct map *map,
 	if (vmlinux[0] == '/')
 		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
 	else
-		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
+		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s/%s",
 			 symbol_conf.symfs, vmlinux);
 
 	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
--
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