linux-kernel - [tip:perf/urgent] perf annotate: Fix broken arrow at row 0 connecting jmp instruction to its target

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Date:   Tue, 11 Jul 2017 01:50:06 -0700
From:   tip-bot for Jin Yao <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, acme@...hat.com, mingo@...nel.org,
        peterz@...radead.org, alexander.shishkin@...ux.intel.com,
        linux-kernel@...r.kernel.org, yao.jin@...ux.intel.com,
        ak@...ux.intel.com, hpa@...or.com, kan.liang@...el.com,
        jolsa@...nel.org
Subject: [tip:perf/urgent] perf annotate: Fix broken arrow at row 0
 connecting jmp instruction to its target

Commit-ID:  80f62589fa52f530cffc50e78c0b5a2ae572d61e
Gitweb:     http://git.kernel.org/tip/80f62589fa52f530cffc50e78c0b5a2ae572d61e
Author:     Jin Yao <yao.jin@...ux.intel.com>
AuthorDate: Thu, 8 Jun 2017 14:01:44 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 10 Jul 2017 16:36:40 -0300

perf annotate: Fix broken arrow at row 0 connecting jmp instruction to its target

When the jump instruction is displayed at the row 0 in annotate view,
the arrow is broken. An example:

 16.86 │   ┌──je     82
  0.01 │      movsd  (%rsp),%xmm0
       │      movsd  0x8(%rsp),%xmm4
       │      movsd  0x8(%rsp),%xmm1
       │      movsd  (%rsp),%xmm3
       │      divsd  %xmm4,%xmm0
       │      divsd  %xmm3,%xmm1
       │      movsd  (%rsp),%xmm2
       │      addsd  %xmm1,%xmm0
       │      addsd  %xmm2,%xmm0
       │      movsd  %xmm0,(%rsp)
       │82:   sub    $0x1,%ebx
 83.03 │    ↑ jne    38
       │      add    $0x10,%rsp
       │      xor    %eax,%eax
       │      pop    %rbx
       │    ← retq

The patch increments the row number before checking with 0.

Signed-off-by: Yao Jin <yao.jin@...ux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: stable@...r.kernel.org
Fixes: 944e1abed9e1 ("perf ui browser: Add method to draw up/down arrow line")
Link: http://lkml.kernel.org/r/1496901704-30275-1-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/ui/browser.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/ui/browser.c b/tools/perf/ui/browser.c
index a4d3762..83874b0 100644
--- a/tools/perf/ui/browser.c
+++ b/tools/perf/ui/browser.c
@@ -704,7 +704,7 @@ static void __ui_browser__line_arrow_down(struct ui_browser *browser,
 		ui_browser__gotorc(browser, row, column + 1);
 		SLsmg_draw_hline(2);
 
-		if (row++ == 0)
+		if (++row == 0)
 			goto out;
 	} else
 		row = 0;