Messages in this thread Patch in this message | | | From | Jason Wessel <> | Subject | [PATCH 14/17] mm,kdb,kgdb: Add a debug reference for the kdb kmap usage | Date | Thu, 5 Aug 2010 09:37:55 -0500 |
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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 --- mm/highmem.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/mm/highmem.c b/mm/highmem.c index 66baa20..7a0aa1b 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 -- 1.6.3.3
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