diff options
| author | Ingo Molnar <mingo@elte.hu> | 2006-07-03 00:24:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-03 15:27:01 -0700 |
| commit | 9a11b49a805665e13a56aa067afaf81d43ec1514 (patch) | |
| tree | bf499956e3f67d1211d68ab1e2eb76645f453dfb /init | |
| parent | fb7e42413a098cc45b3adf858da290033af62bae (diff) | |
| download | lwn-9a11b49a805665e13a56aa067afaf81d43ec1514.tar.gz lwn-9a11b49a805665e13a56aa067afaf81d43ec1514.zip | |
[PATCH] lockdep: better lock debugging
Generic lock debugging:
- generalized lock debugging framework. For example, a bug in one lock
subsystem turns off debugging in all lock subsystems.
- got rid of the caller address passing (__IP__/__IP_DECL__/etc.) from
the mutex/rtmutex debugging code: it caused way too much prototype
hackery, and lockdep will give the same information anyway.
- ability to do silent tests
- check lock freeing in vfree too.
- more finegrained debugging options, to allow distributions to
turn off more expensive debugging features.
There's no separate 'held mutexes' list anymore - but there's a 'held locks'
stack within lockdep, which unifies deadlock detection across all lock
classes. (this is independent of the lockdep validation stuff - lockdep first
checks whether we are holding a lock already)
Here are the current debugging options:
CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_LOCK_ALLOC=y
which do:
config DEBUG_MUTEXES
bool "Mutex debugging, basic checks"
config DEBUG_LOCK_ALLOC
bool "Detect incorrect freeing of live mutexes"
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/main.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c index d604dfef82b8..fc73e1cd8614 100644 --- a/init/main.c +++ b/init/main.c @@ -47,6 +47,7 @@ #include <linux/key.h> #include <linux/unwind.h> #include <linux/buffer_head.h> +#include <linux/debug_locks.h> #include <asm/io.h> #include <asm/bugs.h> @@ -511,6 +512,13 @@ asmlinkage void __init start_kernel(void) console_init(); if (panic_later) panic(panic_later, panic_param); + /* + * Need to run this when irqs are enabled, because it wants + * to self-test [hard/soft]-irqs on/off lock inversion bugs + * too: + */ + locking_selftest(); + #ifdef CONFIG_BLK_DEV_INITRD if (initrd_start && !initrd_below_start_ok && initrd_start < min_low_pfn << PAGE_SHIFT) { |