[src/trunk]: src/external/cddl/osnet/dist/uts/common/fs/zfs Prevent blocking ...

[hannken <hannken%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b335397eef7a
branches:  trunk
changeset: 378659:b335397eef7a
user:      hannken <hannken%NetBSD.org@localhost>
date:      Wed Apr 21 10:02:34 2021 +0000

description:
Prevent blocking l2arc_feed_thread() forever, skip the
cv_timedwait() for negative or zero ticks.

diffstat:

 external/cddl/osnet/dist/uts/common/fs/zfs/arc.c |  7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diffs (19 lines):

diff -r 846e9ff79f30 -r b335397eef7a external/cddl/osnet/dist/uts/common/fs/zfs/arc.c
--- a/external/cddl/osnet/dist/uts/common/fs/zfs/arc.c  Wed Apr 21 09:52:20 2021 +0000
+++ b/external/cddl/osnet/dist/uts/common/fs/zfs/arc.c  Wed Apr 21 10:02:34 2021 +0000
@@ -7246,8 +7246,15 @@ l2arc_feed_thread(void *dummy __unused)
 
        while (l2arc_thread_exit == 0) {
                CALLB_CPR_SAFE_BEGIN(&cpr);
+#ifdef __NetBSD__
+               clock_t now = ddi_get_lbolt();
+               if (next > now)
+                       (void) cv_timedwait(&l2arc_feed_thr_cv,
+                           &l2arc_feed_thr_lock, next - now);
+#else
                (void) cv_timedwait(&l2arc_feed_thr_cv, &l2arc_feed_thr_lock,
                    next - ddi_get_lbolt());
+#endif
                CALLB_CPR_SAFE_END(&cpr, &l2arc_feed_thr_lock);
                next = ddi_get_lbolt() + hz;