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- 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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| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| kerberosIV | ||
| lib | ||
| libexec | ||
| release | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.upgrade | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. kerberosIV KerberosIV (eBones) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html