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| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-08-15 15:29:38 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-10 09:08:50 +0200 |
| commit | 1b2439dbb703ae8d95a9ce7ece6b7800b80f41f0 (patch) | |
| tree | 63c6c105b86ce45ca010dca4bd501a924afd05d1 /lib | |
| parent | b09c3e3f1710b554348c98e78fbf4a661918779a (diff) | |
| download | lwn-1b2439dbb703ae8d95a9ce7ece6b7800b80f41f0.tar.gz lwn-1b2439dbb703ae8d95a9ce7ece6b7800b80f41f0.zip | |
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 8b5a7d304a5f..342858fbabbc 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -536,6 +536,16 @@ config DEBUG_SG If unsure, say N. +config DEBUG_NOTIFIERS + bool "Debug notifier call chains" + depends on DEBUG_KERNEL + help + Enable this to turn on sanity checking for notifier call chains. + This is most useful for kernel developers to make sure that + modules properly unregister themselves from notifier chains. + This is a relatively cheap check but if you care about maximum + performance, say N. + config FRAME_POINTER bool "Compile the kernel with frame pointers" depends on DEBUG_KERNEL && \ |