[PATCH 3/6] ring_buffer: add paranoid check for buffer page

[Steven Rostedt <rostedt@goodmis.org>]

[-- Attachment #1: ring-buffer-paranoid-buffer-page-check.patch --]
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If for some strange reason the buffer_page gets bigger, or the page struct
gets smaller, I want to know this ASAP.  The best way is to not let the
kernel compile.

This patch adds code to test the size of the struct buffer_page against the
page struct and will cause compile issues if the buffer_page ever gets bigger
than the page struct.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---
 kernel/trace/ring_buffer.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

Index: linux-tip.git/kernel/trace/ring_buffer.c
===================================================================
--- linux-tip.git.orig/kernel/trace/ring_buffer.c	2008-09-29 17:31:05.000000000 -0400
+++ linux-tip.git/kernel/trace/ring_buffer.c	2008-09-29 19:59:24.000000000 -0400
@@ -289,6 +289,12 @@ static void rb_free_cpu_buffer(struct ri
 	kfree(cpu_buffer);
 }
 
+/*
+ * Causes compile errors if the struct buffer_page gets bigger
+ * than the struct page.
+ */
+extern int ring_buffer_page_too_big(void);
+
 /**
  * ring_buffer_alloc - allocate a new ring_buffer
  * @size: the size in bytes that is needed.
@@ -305,6 +311,11 @@ struct ring_buffer *ring_buffer_alloc(un
 	int bsize;
 	int cpu;
 
+	/* Paranoid! Optimizes out when all is well */
+	if (sizeof(struct buffer_page) > sizeof(struct page))
+		ring_buffer_page_too_big();
+
+
 	/* keep it in its own cache line */
 	buffer = kzalloc(ALIGN(sizeof(*buffer), cache_line_size()),
 			 GFP_KERNEL);

--