diff options
author | Arjan van de Ven <arjan@linux.intel.com> | 2008-08-15 18:29:38 -0400 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-09-10 03:08:50 -0400 |
commit | 1b2439dbb703ae8d95a9ce7ece6b7800b80f41f0 (patch) | |
tree | 63c6c105b86ce45ca010dca4bd501a924afd05d1 /lib | |
parent | b09c3e3f1710b554348c98e78fbf4a661918779a (diff) |
debug: add notifier chain debugging
during some development we suspected a case where we left something
in a notifier chain that was from a module that was unloaded already...
and that sort of thing is rather hard to track down.
This patch adds a very simple sanity check (which isn't all that
expensive) to make sure the notifier we're about to call is
actually from either the kernel itself of from a still-loaded
module, avoiding a hard-to-chase-down crash.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib')
-rw-r--r-- | lib/Kconfig.debug | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 8b5a7d304a5..342858fbabb 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug | |||
@@ -536,6 +536,16 @@ config DEBUG_SG | |||
536 | 536 | ||
537 | If unsure, say N. | 537 | If unsure, say N. |
538 | 538 | ||
539 | config DEBUG_NOTIFIERS | ||
540 | bool "Debug notifier call chains" | ||
541 | depends on DEBUG_KERNEL | ||
542 | help | ||
543 | Enable this to turn on sanity checking for notifier call chains. | ||
544 | This is most useful for kernel developers to make sure that | ||
545 | modules properly unregister themselves from notifier chains. | ||
546 | This is a relatively cheap check but if you care about maximum | ||
547 | performance, say N. | ||
548 | |||
539 | config FRAME_POINTER | 549 | config FRAME_POINTER |
540 | bool "Compile the kernel with frame pointers" | 550 | bool "Compile the kernel with frame pointers" |
541 | depends on DEBUG_KERNEL && \ | 551 | depends on DEBUG_KERNEL && \ |