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authorPaolo Valente <paolo.valente@unimore.it>2013-03-05 08:04:58 +0000
committerDavid S. Miller <davem@davemloft.net>2013-03-06 02:47:05 -0500
commit624b85fb96206879c8146abdba071222bbd25259 (patch)
treee6fbd60c1cea8682333422ae797fd9ff83f83ce6 /net
parent9b99b7e90bf5cd9a88823c49574ba80d92a98262 (diff)
downloadvexpress-lsk-624b85fb96206879c8146abdba071222bbd25259.tar.gz
pkt_sched: sch_qfq: fix the update of eligible-group sets
Between two invocations of make_eligible, the system virtual time may happen to grow enough that, in its binary representation, a bit with higher order than 31 flips. This happens especially with TSO/GSO. Before this fix, the mask used in make_eligible was computed as (1UL<<index_of_last_flipped_bit)-1, whose value is well defined on a 64-bit architecture, because index_of_flipped_bit <= 63, but is in general undefined on a 32-bit architecture if index_of_flipped_bit > 31. The fix just replaces 1UL with 1ULL. Signed-off-by: Paolo Valente <paolo.valente@unimore.it> Reviewed-by: Fabio Checconi <fchecconi@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sched/sch_qfq.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index 489edd92993..39d85cc0db2 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -821,7 +821,7 @@ static void qfq_make_eligible(struct qfq_sched *q)
unsigned long old_vslot = q->oldV >> q->min_slot_shift;
if (vslot != old_vslot) {
- unsigned long mask = (1UL << fls(vslot ^ old_vslot)) - 1;
+ unsigned long mask = (1ULL << fls(vslot ^ old_vslot)) - 1;
qfq_move_groups(q, mask, IR, ER);
qfq_move_groups(q, mask, IB, EB);
}