From eac790059b22883763759aeb468ff862bae4627e Mon Sep 17 00:00:00 2001
From: Jason Wessel <jason.wessel@windriver.com>
Date: Thu, 5 Aug 2010 09:22:24 -0500
Subject: [PATCH] mm,kdb,kgdb: Add a debug reference for the kdb kmap usage

The kdb kmap should never get used outside of the kernel debugger
exception context.

Signed-off-by: Jason Wessel<jason.wessel@windriver.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Ingo Molnar <mingo@elte.hu>
CC: linux-mm@kvack.org
---
 mm/highmem.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/highmem.c b/mm/highmem.c
index 66baa20f78f5..7a0aa1be4993 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -26,6 +26,7 @@
 #include <linux/init.h>
 #include <linux/hash.h>
 #include <linux/highmem.h>
+#include <linux/kgdb.h>
 #include <asm/tlbflush.h>
 
 /*
@@ -470,6 +471,12 @@ void debug_kmap_atomic(enum km_type type)
 			warn_count--;
 		}
 	}
+#ifdef CONFIG_KGDB_KDB
+	if (unlikely(type == KM_KDB && atomic_read(&kgdb_active) == -1)) {
+		WARN_ON(1);
+		warn_count--;
+	}
+#endif /* CONFIG_KGDB_KDB */
 }
 
 #endif