perf symbols: Remove unused 'end' arg in kallsyms parse cb

kallsyms__parse() takes a callback that is called on every discovered
symbol. As /proc/kallsyms does not supply symbol sizes, the callback was
simply called with end=start, faking the symbol size to 1.

All of the callbacks (there are 2) used in calls to kallsyms__parse()
are _only_ used as callbacks for kallsyms__parse().

Given that kallsyms__parse() lacks real information about what
end/length should be, don't make up a length in kallsyms__parse().
Instead have the callbacks handle guessing the length.

Also relocate a comment regarding symbol creation to the callback which
does symbol creation (kallsyms__parse() is not in general used to create
symbols).

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: David Hansen <dave@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Matt Hellsley <matthltc@us.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1344637382-22789-3-git-send-email-cody@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 12 insertions, 13 deletions

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 2a6f33cd888c..3a0f1a5da91c 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -412,7 +412,7 @@ struct process_symbol_args {
 };
 
 static int find_symbol_cb(void *arg, const char *name, char type,
-                          u64 start, u64 end __used)
+                          u64 start)
 {
         struct process_symbol_args *args = arg;
 
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 9f181a86f3b2..21270029f07b 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -563,7 +563,7 @@ size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
 
 int kallsyms__parse(const char *filename, void *arg,
                     int (*process_symbol)(void *arg, const char *name,
-                                          char type, u64 start, u64 end))
+                                          char type, u64 start))
 {
         char *line = NULL;
         size_t n;
@@ -603,13 +603,8 @@ int kallsyms__parse(const char *filename, void *arg,
                         break;
                 }
 
-                /*
-                 * module symbols are not sorted so we add all
-                 * symbols, setting length to 1, and rely on
-                 * symbols__fixup_end() to fix it up.
-                 */
                 err = process_symbol(arg, symbol_name,
-                                     symbol_type, start, start);
+                                     symbol_type, start);
                 if (err)
                         break;
         }
@@ -636,7 +631,7 @@ static u8 kallsyms2elf_type(char type)
 }
 
 static int map__process_kallsym_symbol(void *arg, const char *name,
-                                       char type, u64 start, u64 end)
+                                       char type, u64 start)
 {
         struct symbol *sym;
         struct process_kallsyms_args *a = arg;
@@ -645,8 +640,12 @@ static int map__process_kallsym_symbol(void *arg, const char *name,
         if (!symbol_type__is_a(type, a->map->type))
                 return 0;
 
-        sym = symbol__new(start, end - start + 1,
-                          kallsyms2elf_type(type), name);
+        /*
+         * module symbols are not sorted so we add all
+         * symbols, setting length to 0, and rely on
+         * symbols__fixup_end() to fix it up.
+         */
+        sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
         if (sym == NULL)
                 return -ENOMEM;
         /*
@@ -1729,7 +1728,7 @@ struct process_args {
 };
 
 static int symbol__in_kernel(void *arg, const char *name,
-                             char type __used, u64 start, u64 end __used)
+                             char type __used, u64 start)
 {
         struct process_args *args = arg;
 
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 38ccbbb39faa..c9534fe0720d 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -299,7 +299,7 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits);
 int build_id__sprintf(const u8 *build_id, int len, char *bf);
 int kallsyms__parse(const char *filename, void *arg,
                     int (*process_symbol)(void *arg, const char *name,
-                                          char type, u64 start, u64 end));
+                                          char type, u64 start));
 int filename__read_debuglink(const char *filename, char *debuglink,
                              size_t size);