perf tools: Add compression id into 'struct kmod_path'

Store a decompression ID in 'struct kmod_path', so it can be later
stored in 'struct dso'.

Switch 'struct kmod_path's 'comp' from 'bool' to 'int' to return the
compressions array index. Add 0 index item into compressions array, so
that the comp usage stays as it was: 0 - no compression, != 0
compression index.

Update the kmod_path tests.

Committer notes:

Use a designated initializer + terminating comma, e.g. { .fmt = NULL, }, to fix
the build in several distros:

  centos:6:       util/dso.c:201: error: missing initializer
  centos:6:       util/dso.c:201: error: (near initialization for 'compressions[0].decompress')
  debian:9:       util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]
  fedora:25:      util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]
  fedora:26:      util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]
  fedora:27:      util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]
  oraclelinux:6:  util/dso.c:201: error: missing initializer
  oraclelinux:6:  util/dso.c:201: error: (near initialization for 'compressions[0].decompress')
  ubuntu:12.04.5: util/dso.c:201:2: error: missing initializer [-Werror=missing-field-initializers]
  ubuntu:12.04.5: util/dso.c:201:2: error: (near initialization for 'compressions[0].decompress') [-Werror=missing-field-initializers]
  ubuntu:16.04:   util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]
  ubuntu:16.10:   util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]
  ubuntu:16.10:   util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]
  ubuntu:17.10:   util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180817094813.15086-7-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 33 insertions, 29 deletions

diff --git a/tools/perf/tests/kmod-path.c b/tools/perf/tests/kmod-path.c
index 148dd31cc201..f92f78f683ea 100644
--- a/tools/perf/tests/kmod-path.c
+++ b/tools/perf/tests/kmod-path.c
@@ -6,7 +6,7 @@
 #include "debug.h"
 
 static int test(const char *path, bool alloc_name, bool alloc_ext,
-                bool kmod, bool comp, const char *name, const char *ext)
+                bool kmod, int comp, const char *name, const char *ext)
 {
         struct kmod_path m;
 
@@ -54,47 +54,47 @@ static int test_is_kernel_module(const char *path, int cpumode, bool expect)
 int test__kmod_path__parse(struct test *t __maybe_unused, int subtest __maybe_unused)
 {
         /* path                alloc_name  alloc_ext   kmod  comp   name     ext */
-        T("/xxxx/xxxx/x-x.ko", true      , true      , true, false, "[x_x]", NULL);
-        T("/xxxx/xxxx/x-x.ko", false     , true      , true, false, NULL   , NULL);
-        T("/xxxx/xxxx/x-x.ko", true      , false     , true, false, "[x_x]", NULL);
-        T("/xxxx/xxxx/x-x.ko", false     , false     , true, false, NULL   , NULL);
+        T("/xxxx/xxxx/x-x.ko", true      , true      , true, 0    , "[x_x]", NULL);
+        T("/xxxx/xxxx/x-x.ko", false     , true      , true, 0    , NULL   , NULL);
+        T("/xxxx/xxxx/x-x.ko", true      , false     , true, 0    , "[x_x]", NULL);
+        T("/xxxx/xxxx/x-x.ko", false     , false     , true, 0    , NULL   , NULL);
         M("/xxxx/xxxx/x-x.ko", PERF_RECORD_MISC_CPUMODE_UNKNOWN, true);
         M("/xxxx/xxxx/x-x.ko", PERF_RECORD_MISC_KERNEL, true);
         M("/xxxx/xxxx/x-x.ko", PERF_RECORD_MISC_USER, false);
 
 #ifdef HAVE_ZLIB_SUPPORT
         /* path                alloc_name  alloc_ext   kmod  comp  name   ext */
-        T("/xxxx/xxxx/x.ko.gz", true     , true      , true, true, "[x]", "gz");
-        T("/xxxx/xxxx/x.ko.gz", false    , true      , true, true, NULL , "gz");
-        T("/xxxx/xxxx/x.ko.gz", true     , false     , true, true, "[x]", NULL);
-        T("/xxxx/xxxx/x.ko.gz", false    , false     , true, true, NULL , NULL);
+        T("/xxxx/xxxx/x.ko.gz", true     , true      , true, 1   , "[x]", "gz");
+        T("/xxxx/xxxx/x.ko.gz", false    , true      , true, 1   , NULL , "gz");
+        T("/xxxx/xxxx/x.ko.gz", true     , false     , true, 1   , "[x]", NULL);
+        T("/xxxx/xxxx/x.ko.gz", false    , false     , true, 1   , NULL , NULL);
         M("/xxxx/xxxx/x.ko.gz", PERF_RECORD_MISC_CPUMODE_UNKNOWN, true);
         M("/xxxx/xxxx/x.ko.gz", PERF_RECORD_MISC_KERNEL, true);
         M("/xxxx/xxxx/x.ko.gz", PERF_RECORD_MISC_USER, false);
 
         /* path              alloc_name  alloc_ext  kmod   comp  name    ext */
-        T("/xxxx/xxxx/x.gz", true      , true     , false, true, "x.gz" ,"gz");
-        T("/xxxx/xxxx/x.gz", false     , true     , false, true, NULL   ,"gz");
-        T("/xxxx/xxxx/x.gz", true      , false    , false, true, "x.gz" , NULL);
-        T("/xxxx/xxxx/x.gz", false     , false    , false, true, NULL   , NULL);
+        T("/xxxx/xxxx/x.gz", true      , true     , false, 1   , "x.gz" ,"gz");
+        T("/xxxx/xxxx/x.gz", false     , true     , false, 1   , NULL   ,"gz");
+        T("/xxxx/xxxx/x.gz", true      , false    , false, 1   , "x.gz" , NULL);
+        T("/xxxx/xxxx/x.gz", false     , false    , false, 1   , NULL   , NULL);
         M("/xxxx/xxxx/x.gz", PERF_RECORD_MISC_CPUMODE_UNKNOWN, false);
         M("/xxxx/xxxx/x.gz", PERF_RECORD_MISC_KERNEL, false);
         M("/xxxx/xxxx/x.gz", PERF_RECORD_MISC_USER, false);
 
         /* path   alloc_name  alloc_ext  kmod   comp  name     ext */
-        T("x.gz", true      , true     , false, true, "x.gz", "gz");
-        T("x.gz", false     , true     , false, true, NULL  , "gz");
-        T("x.gz", true      , false    , false, true, "x.gz", NULL);
-        T("x.gz", false     , false    , false, true, NULL  , NULL);
+        T("x.gz", true      , true     , false, 1   , "x.gz", "gz");
+        T("x.gz", false     , true     , false, 1   , NULL  , "gz");
+        T("x.gz", true      , false    , false, 1   , "x.gz", NULL);
+        T("x.gz", false     , false    , false, 1   , NULL  , NULL);
         M("x.gz", PERF_RECORD_MISC_CPUMODE_UNKNOWN, false);
         M("x.gz", PERF_RECORD_MISC_KERNEL, false);
         M("x.gz", PERF_RECORD_MISC_USER, false);
 
         /* path      alloc_name  alloc_ext  kmod  comp  name  ext */
-        T("x.ko.gz", true      , true     , true, true, "[x]", "gz");
-        T("x.ko.gz", false     , true     , true, true, NULL , "gz");
-        T("x.ko.gz", true      , false    , true, true, "[x]", NULL);
-        T("x.ko.gz", false     , false    , true, true, NULL , NULL);
+        T("x.ko.gz", true      , true     , true, 1   , "[x]", "gz");
+        T("x.ko.gz", false     , true     , true, 1   , NULL , "gz");
+        T("x.ko.gz", true      , false    , true, 1   , "[x]", NULL);
+        T("x.ko.gz", false     , false    , true, 1   , NULL , NULL);
         M("x.ko.gz", PERF_RECORD_MISC_CPUMODE_UNKNOWN, true);
         M("x.ko.gz", PERF_RECORD_MISC_KERNEL, true);
         M("x.ko.gz", PERF_RECORD_MISC_USER, false);
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index b8b5fdb1a15b..d34e47bb09d9 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -189,10 +189,15 @@ int dso__read_binary_type_filename(const struct dso *dso,
         return ret;
 }
 
+enum {
+        COMP_ID__NONE = 0,
+};
+
 static const struct {
         const char *fmt;
         int (*decompress)(const char *input, int output);
 } compressions[] = {
+        [COMP_ID__NONE] = { .fmt = NULL, },
 #ifdef HAVE_ZLIB_SUPPORT
         { "gz", gzip_decompress_to_file },
 #endif
@@ -202,15 +207,15 @@ static const struct {
         { NULL, NULL },
 };
 
-static bool is_supported_compression(const char *ext)
+static int is_supported_compression(const char *ext)
 {
         unsigned i;
 
-        for (i = 0; compressions[i].fmt; i++) {
+        for (i = 1; compressions[i].fmt; i++) {
                 if (!strcmp(ext, compressions[i].fmt))
-                        return true;
+                        return i;
         }
-        return false;
+        return COMP_ID__NONE;
 }
 
 bool is_kernel_module(const char *pathname, int cpumode)
@@ -372,10 +377,9 @@ int __kmod_path__parse(struct kmod_path *m, const char *path,
                 return 0;
         }
 
-        if (is_supported_compression(ext + 1)) {
-                m->comp = true;
+        m->comp = is_supported_compression(ext + 1);
+        if (m->comp > COMP_ID__NONE)
                 ext -= 3;
-        }
 
         /* Check .ko extension only if there's enough name left. */
         if (ext > name)
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 870346b333ee..7bde23f6e5a9 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -262,7 +262,7 @@ int dso__decompress_kmodule_path(struct dso *dso, const char *name,
 struct kmod_path {
         char *name;
         char *ext;
-        bool  comp;
+        int   comp;
         bool  kmod;
 };