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authorJason Wessel <jason.wessel@windriver.com>2010-08-05 09:22:24 -0500
committerJason Wessel <jason.wessel@windriver.com>2010-08-05 09:22:24 -0500
commiteac790059b22883763759aeb468ff862bae4627e (patch)
tree912fbcca1887a75b47c19020fb4acc79fb6ce3f9 /mm/highmem.c
parent9264b278be42c031dc76517a0d4bb154f5dcf470 (diff)
downloadlinux-eac790059b22883763759aeb468ff862bae4627e.tar.gz
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
Diffstat (limited to 'mm/highmem.c')
-rw-r--r--mm/highmem.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/highmem.c b/mm/highmem.c
index 66baa20f78f..7a0aa1be499 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