patchbot at xen
Apr 20, 2012, 7:00 PM
Post #1 of 1
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[xen-unstable] x86/mm: BUG() rather than panic() on mm lock order violations
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# HG changeset patch
# User Tim Deegan <tim [at] xen>
# Date 1334763793 -3600
# Node ID 4b1d80d52ced6a86032d37f74cec1af62d63a4c1
# Parent 7c777cb8f705411b77c551f34ba88bdc09e38ab8
x86/mm: BUG() rather than panic() on mm lock order violations
That gives us a backtrace showing where the bad lock happens.
Reported-by: Andres Lagar-Cavilla <andres [at] lagarcavilla
Signed-off-by: Tim Deegan <tim [at] xen>
Acked-by: Andres Lagar-Cavilla <andres [at] lagarcavilla>
Committed-by: Tim Deegan <tim [at] xen>
---
diff -r 7c777cb8f705 -r 4b1d80d52ced xen/arch/x86/mm/mm-locks.h
--- a/xen/arch/x86/mm/mm-locks.h Wed Apr 18 16:49:55 2012 +0100
+++ b/xen/arch/x86/mm/mm-locks.h Wed Apr 18 16:43:13 2012 +0100
@@ -50,8 +50,11 @@ static inline int mm_locked_by_me(mm_loc
#define __check_lock_level(l) \
do { \
if ( unlikely(__get_lock_level()) > (l) ) \
- panic("mm locking order violation: %i > %i\n", \
- __get_lock_level(), (l)); \
+ { \
+ printk("mm locking order violation: %i > %i\n", \
+ __get_lock_level(), (l)); \
+ BUG(); \
+ } \
} while(0)
#define __set_lock_level(l) \
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