git: kernel - RB_SCAN() requires a short-term spinlock
commit 5f97768d56d8f4feadf9407630849bdd67cad2f1
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Mon Nov 28 22:03:23 2011 -0800
kernel - RB_SCAN() requires a short-term spinlock
* RB_SCAN() links and unlinks an info structure. If called with a shared
lock the linking and unlinking operations requires a very short-term spin
lock to avoid clobbering each other.
* Note that RB_REMOVE() scans the inprog list but this function can only
be safely called with the RB tree held exclusively anyway, so there's
no need to spinlock the info list.
* Add kern/subr_rbtree.c glue functions for acquiring and releasing the
spinlock, so sys/tree.h only needs to include sys/spinlock.h and not
also sys/spinlock2.h
Reported-by: sephe
Summary of changes:
sys/conf/files | 1 +
sys/kern/{subr_shims.c => subr_rbtree.c} | 47 ++++++++++++++++--------------
sys/sys/tree.h | 26 +++++++++++++++-
3 files changed, 50 insertions(+), 24 deletions(-)
copy sys/kern/{subr_shims.c => subr_rbtree.c} (74%)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/5f97768d56d8f4feadf9407630849bdd67cad2f1
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