Author: mjg
Date: Thu Oct 19 00:31:00 2017
New Revision: 324733
URL: https://svnweb.freebsd.org/changeset/base/324733
Log:
sysvsem: check if semu_list has anything on it before grabbing the lock
This should get a process-specific support instead.
MFC after: 1 week
Modified:
head/sys/kern/sysv_sem.c
Modified: head/sys/kern/sysv_sem.c
==============================================================================
--- head/sys/kern/sysv_sem.c Wed Oct 18 22:56:46 2017 (r324732)
+++ head/sys/kern/sysv_sem.c Thu Oct 19 00:31:00 2017 (r324733)
@@ -1412,6 +1412,8 @@ semexit_myhook(void *arg, struct proc *p)
* Go through the chain of undo vectors looking for one
* associated with this process.
*/
+ if (LIST_EMPTY(&semu_list))
+ return;
SEMUNDO_LOCK();
LIST_FOREACH(suptr, &semu_list, un_next) {
if (suptr->un_proc == p)
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