From be991d5e8cc8c103062932cfe1b2aadcccd33d9f Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Sun, 16 Nov 2008 07:28:46 +0100
Subject: [PATCH] --- yaml --- r: 121117 b: refs/heads/master c:
 c91add5fa68ea9b1f2923b3788c5dae0e60e1f6b h: refs/heads/master i:   121115:
 8b84ee26709c70e1ab2484a253e69f2ce280e7fe v: v3

---
 [refs]                           |  2 +-
 trunk/kernel/trace/ring_buffer.c |  6 ++++++
 trunk/scripts/bootgraph.pl       | 12 +++++++-----
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/[refs] b/[refs]
index 3ead27ad4d2d..977d5ad10ab0 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b3535c6390f27d04273e4eee0bc687f171fbf5f4
+refs/heads/master: c91add5fa68ea9b1f2923b3788c5dae0e60e1f6b
diff --git a/trunk/kernel/trace/ring_buffer.c b/trunk/kernel/trace/ring_buffer.c
index 2d6c2cf0c3bc..caa4fda50f8a 100644
--- a/trunk/kernel/trace/ring_buffer.c
+++ b/trunk/kernel/trace/ring_buffer.c
@@ -533,6 +533,12 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
 	LIST_HEAD(pages);
 	int i, cpu;
 
+	/*
+	 * Always succeed at resizing a non-existent buffer:
+	 */
+	if (!buffer)
+		return size;
+
 	size = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
 	size *= BUF_PAGE_SIZE;
 	buffer_size = buffer->pages * BUF_PAGE_SIZE;
diff --git a/trunk/scripts/bootgraph.pl b/trunk/scripts/bootgraph.pl
index a8635a10fef2..f0af9aa9b243 100644
--- a/trunk/scripts/bootgraph.pl
+++ b/trunk/scripts/bootgraph.pl
@@ -78,11 +78,13 @@
 }
 
 if ($count == 0) {
-	print "No data found in the dmesg. Make sure that 'printk.time=1' and\n";
-	print "'initcall_debug' are passed on the kernel command line.\n\n";
-	print "Usage: \n";
-	print "      dmesg | perl scripts/bootgraph.pl > output.svg\n\n";
-	exit;
+    print STDERR <<END;
+No data found in the dmesg. Make sure that 'printk.time=1' and
+'initcall_debug' are passed on the kernel command line.
+Usage:
+      dmesg | perl scripts/bootgraph.pl > output.svg
+END
+    exit 1;
 }
 
 print "<?xml version=\"1.0\" standalone=\"no\"?> \n";