linux-kernel - [tip:tracing/core] tracing/trace_stack: fix the number of entries in the header

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Message-ID: <tip-083a63b48e4dd0a6a2d44216720076dc81ebb255@git.kernel.org>
Date:	Sun, 7 Jun 2009 10:21:48 GMT
From:	tip-bot for walimis <walimisdev@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, walimisdev@...il.com, hpa@...or.com,
	mingo@...hat.com, rostedt@...dmis.org, tglx@...utronix.de
Subject: [tip:tracing/core] tracing/trace_stack: fix the number of entries in the header

Commit-ID:  083a63b48e4dd0a6a2d44216720076dc81ebb255
Gitweb:     http://git.kernel.org/tip/083a63b48e4dd0a6a2d44216720076dc81ebb255
Author:     walimis <walimisdev@...il.com>
AuthorDate: Wed, 3 Jun 2009 16:01:28 +0800
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Wed, 3 Jun 2009 10:24:44 -0400

tracing/trace_stack: fix the number of entries in the header

The last entry in the stack_dump_trace is ULONG_MAX, which is not
a valid entry, but max_stack_trace.nr_entries has accounted for it.
So when printing the header, we should decrease it by one.
Before fix, print as following, for example:

	Depth    Size   Location    (53 entries)	<--- should be 52
	-----    ----   --------
  0)     3264     108   update_wall_time+0x4d5/0x9a0
  ...
 51)       80      80   syscall_call+0x7/0xb
 ^^^
   it's correct.

Signed-off-by: walimis <walimisdev@...il.com>
LKML-Reference: <1244016090-7814-1-git-send-email-walimisdev@...il.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>


---
 kernel/trace/trace_stack.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 1796f00..2d7aebd 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -265,7 +265,7 @@ static int t_show(struct seq_file *m, void *v)
 		seq_printf(m, "        Depth    Size   Location"
 			   "    (%d entries)\n"
 			   "        -----    ----   --------\n",
-			   max_stack_trace.nr_entries);
+			   max_stack_trace.nr_entries - 1);
 
 		if (!stack_tracer_enabled && !max_stack_size)
 			print_disabled(m);
--
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