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mm,kdb,kgdb: Add a debug reference for the kdb kmap usage

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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
This commit is contained in:
Jason Wessel 2010-08-05 09:22:24 -05:00
parent 9264b278be
commit eac790059b
1 changed files with 7 additions and 0 deletions
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7
mm/highmem.c
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@ -26,6 +26,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/hash.h> #include <linux/hash.h>
#include <linux/highmem.h> #include <linux/highmem.h>
#include <linux/kgdb.h>
#include <asm/tlbflush.h> #include <asm/tlbflush.h>
/* /*
@ -470,6 +471,12 @@ void debug_kmap_atomic(enum km_type type)
warn_count--; 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 #endif