[tip:perf/core] perf report: Fix branch stack mode cannot be set

[tip-bot for He Kuang <tipbot@zytor.com>]

Commit-ID:  fefd2d9619de3bf0bf02a8622e9f445c3d19cc3f
Gitweb:     http://git.kernel.org/tip/fefd2d9619de3bf0bf02a8622e9f445c3d19cc3f
Author:     He Kuang <hekuang@huawei.com>
AuthorDate: Sun, 15 Feb 2015 10:33:37 +0800
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 27 Feb 2015 15:52:42 -0300

perf report: Fix branch stack mode cannot be set

When perf.data file is obtained using 'perf record -b', perf report
should use branch stack mode to generate output. But this function is
broken by improper comparison between boolean and constant -1.

before this patch:

  $ perf report -b -i perf.data
  Samples: 16  of event 'cycles', Event count (approx.): 3171896
  Overhead  Command  Shared Object      Symbol
    13.59%  ls       [kernel.kallsyms]  [k] prio_tree_remove
    13.16%  ls       [kernel.kallsyms]  [k] change_pte_range
    12.09%  ls       [kernel.kallsyms]  [k] page_fault
    12.02%  ls       [kernel.kallsyms]  [k] zap_pte_range
  ...

after this patch:

  $ perf report -b -i perf.data
  Samples: 256  of event 'cycles', Event count (approx.): 256
  Overhead  Command  Source Shared Object  Source Symbol                               Target Shared Object  Target Symbol
     9.38%  ls       [unknown]             [k] 0000000000000000                        [unknown]             [k] 0000000000000000
     6.25%  ls       libc-2.19.so          [.] _dl_addr                                libc-2.19.so          [.] _dl_addr
     6.25%  ls       [kernel.kallsyms]     [k] zap_pte_range                           [kernel.kallsyms]     [k] zap_pte_range
     6.25%  ls       [kernel.kallsyms]     [k] change_pte_range                        [kernel.kallsyms]     [k] change_pte_range
     0.39%  ls       [kernel.kallsyms]     [k] prio_tree_remove                        [kernel.kallsyms]     [k] prio_tree_remove
  ...

Signed-off-by: He Kuang <hekuang@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1423967617-28879-1-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-report.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 0ba5f07..fb35034 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -768,7 +768,7 @@ repeat:
 	 * 0/1 means the user chose a mode.
 	 */
 	if (((branch_mode == -1 && has_br_stack) || branch_mode == 1) &&
-	    branch_call_mode == -1) {
+	    !branch_call_mode) {
 		sort__mode = SORT_MODE__BRANCH;
 		symbol_conf.cumulate_callchain = false;
 	}