linux-kernel - [PATCH 2.6.19] Do not always end the stack trace with ULONG

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Date:	Tue, 12 Dec 2006 10:57:44 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Andi Kleen <ak@...e.de>
Subject: [PATCH 2.6.19] Do not always end the stack trace with ULONG_MAX

It makes more sense to end the stack trace with ULONG_MAX only if
nr_entries < max_entries. Otherwise, we lose one entry in the long
stack traces and cannot know whether the trace was complete or not.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
---

 arch/x86_64/kernel/stacktrace.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86_64/kernel/stacktrace.c b/arch/x86_64/kernel/stacktrace.c
index 6026b31..65ac2c6 100644
--- a/arch/x86_64/kernel/stacktrace.c
+++ b/arch/x86_64/kernel/stacktrace.c
@@ -32,7 +32,7 @@ static void save_stack_address(void *data, unsigned long addr)
 		trace->skip--;
 		return;
 	}
-	if (trace->nr_entries < trace->max_entries - 1)
+	if (trace->nr_entries < trace->max_entries)
 		trace->entries[trace->nr_entries++] = addr;
 }
 
@@ -49,7 +49,8 @@ static struct stacktrace_ops save_stack_ops = {
 void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
 {
 	dump_trace(task, NULL, NULL, &save_stack_ops, trace);
-	trace->entries[trace->nr_entries++] = ULONG_MAX;
+	if (trace->nr_entries < trace->max_entries)
+		trace->entries[trace->nr_entries++] = ULONG_MAX;
 }
 EXPORT_SYMBOL(save_stack_trace);
 
-
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