linux-kernel - [PATCH 08/13] perf tools: Use compression id in decompress

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Date:   Fri, 17 Aug 2018 11:48:08 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>
Subject: [PATCH 08/13] perf tools: Use compression id in decompress_kmodule function

Once we parsed out the compression ID, we dont need to
iterate all available compressions and we can call it
directly.

Link: http://lkml.kernel.org/n/tip-55zrhxhr699pswx34d0hd4u9@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/dso.c | 25 +++----------------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index f0e4cc43c97e..1cee958c9a2a 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -244,19 +244,6 @@ bool is_kernel_module(const char *pathname, int cpumode)
 	return m.kmod;
 }
 
-static bool
-decompress_to_file(const char *ext, const char *filename, int output_fd)
-{
-	unsigned i;
-
-	for (i = 0; compressions[i].fmt; i++) {
-		if (!strcmp(ext, compressions[i].fmt))
-			return !compressions[i].decompress(filename,
-							   output_fd);
-	}
-	return false;
-}
-
 bool dso__needs_decompress(struct dso *dso)
 {
 	return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
@@ -266,31 +253,25 @@ bool dso__needs_decompress(struct dso *dso)
 static int decompress_kmodule(struct dso *dso, const char *name, char *tmpbuf)
 {
 	int fd = -1;
-	struct kmod_path m;
 
 	if (!dso__needs_decompress(dso))
 		return -1;
 
-	if (kmod_path__parse_ext(&m, dso->long_name))
+	if (dso->comp == COMP_ID__NONE)
 		return -1;
 
-	if (!m.comp)
-		goto out;
-
 	fd = mkstemp(tmpbuf);
 	if (fd < 0) {
 		dso->load_errno = errno;
-		goto out;
+		return -1;
 	}
 
-	if (!decompress_to_file(m.ext, name, fd)) {
+	if (compressions[dso->comp].decompress(name, fd)) {
 		dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
 		close(fd);
 		fd = -1;
 	}
 
-out:
-	free(m.ext);
 	return fd;
 }
 
-- 
2.17.1