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| /freebsd-11-stable/sys/kern/ | ||
| H A D | subr_witness.c | diff 111881 Tue Mar 04 18:56:39 MST 2003 jhb A small overhaul of witness: - Add a comment about special lock order rules and Giant near the top of subr_witness.c. Specifically, this documents and explains the real lock order relationship between Giant and sleepable locks (i.e. lockmgr locks and sx locks). Basically, Giant can be safely acquired either before or after sleepable locks and the case of Giant before a sleepable lock is exempted as a special case. - Add a new static function 'witness_list_lock()' that displays a single line of information about a struct lock_instance. This is used to make the output of witness messages more consistent and reduce some code duplication. - Fixup a few comments in witness_lock(). - Properly handle the Giant-before-sleepable-lock lock order exception in a more general fashion and remove the no longer needed LI_SLEPT flag. - Break up the last condition before assuming a reversal a bit to try and make the logic less confusing in witness_lock(). - Axe WITNESS_SLEEP() now that LI_SLEPT is no longer needed and replace it with a more general WITNESS_WARN() macro/function combination. WITNESS_WARN() allows you to output a customized message out to the console along with a list of held locks. It will optionally drop into the debugger as well. You can exempt a single lock from the check by passing it in as the second argument. You can also use flags to specify if Giant should be exempt from the check, if all sleepable locks should be exempt from the check, and if witness should panic if any non-exempt locks are found. - Make the witness_list() function static. Other areas of the kernel should use the new WITNESS_WARN() instead. |
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