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Subject[ANNOUNCE] v5.15.2-rt20
Dear RT folks!

I'm pleased to announce the v5.15.2-rt20 patch set.

Changes since v5.15.2-rt19:

- A patch from upstream to avoid a "larg stack frame" warning.

Known issues
- netconsole triggers WARN.

- The "Memory controller" (CONFIG_MEMCG) has been disabled.

- Valentin Schneider reported a few splats on ARM64, see
https://lkml.kernel.org/r/20210810134127.1394269-1-valentin.schneider@arm.com

The delta patch against v5.15.2-rt19 is appended below and can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.15/incr/patch-5.15.2-rt19-rt20.patch.xz

You can get this release via the git tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v5.15.2-rt20

The RT patch against v5.15.2 can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.15/older/patch-5.15.2-rt20.patch.xz

The split quilt queue is available at:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.15/older/patches-5.15.2-rt20.tar.xz

Sebastian

diff --git a/localversion-rt b/localversion-rt
index 483ad771f201a..e095ab8197147 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt19
+-rt20
diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index 72de08ef8335e..1073c76d05c45 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -56,6 +56,7 @@ struct gred_sched {
u32 DPs;
u32 def;
struct red_vars wred_set;
+ struct tc_gred_qopt_offload *opt;
};

static inline int gred_wred_mode(struct gred_sched *table)
@@ -311,42 +312,43 @@ static void gred_offload(struct Qdisc *sch, enum tc_gred_command command)
{
struct gred_sched *table = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
- struct tc_gred_qopt_offload opt = {
- .command = command,
- .handle = sch->handle,
- .parent = sch->parent,
- };
+ struct tc_gred_qopt_offload *opt = table->opt;

if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
return;

+ memset(opt, 0, sizeof(*opt));
+ opt->command = command;
+ opt->handle = sch->handle;
+ opt->parent = sch->parent;
+
if (command == TC_GRED_REPLACE) {
unsigned int i;

- opt.set.grio_on = gred_rio_mode(table);
- opt.set.wred_on = gred_wred_mode(table);
- opt.set.dp_cnt = table->DPs;
- opt.set.dp_def = table->def;
+ opt->set.grio_on = gred_rio_mode(table);
+ opt->set.wred_on = gred_wred_mode(table);
+ opt->set.dp_cnt = table->DPs;
+ opt->set.dp_def = table->def;

for (i = 0; i < table->DPs; i++) {
struct gred_sched_data *q = table->tab[i];

if (!q)
continue;
- opt.set.tab[i].present = true;
- opt.set.tab[i].limit = q->limit;
- opt.set.tab[i].prio = q->prio;
- opt.set.tab[i].min = q->parms.qth_min >> q->parms.Wlog;
- opt.set.tab[i].max = q->parms.qth_max >> q->parms.Wlog;
- opt.set.tab[i].is_ecn = gred_use_ecn(q);
- opt.set.tab[i].is_harddrop = gred_use_harddrop(q);
- opt.set.tab[i].probability = q->parms.max_P;
- opt.set.tab[i].backlog = &q->backlog;
+ opt->set.tab[i].present = true;
+ opt->set.tab[i].limit = q->limit;
+ opt->set.tab[i].prio = q->prio;
+ opt->set.tab[i].min = q->parms.qth_min >> q->parms.Wlog;
+ opt->set.tab[i].max = q->parms.qth_max >> q->parms.Wlog;
+ opt->set.tab[i].is_ecn = gred_use_ecn(q);
+ opt->set.tab[i].is_harddrop = gred_use_harddrop(q);
+ opt->set.tab[i].probability = q->parms.max_P;
+ opt->set.tab[i].backlog = &q->backlog;
}
- opt.set.qstats = &sch->qstats;
+ opt->set.qstats = &sch->qstats;
}

- dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_GRED, &opt);
+ dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_GRED, opt);
}

static int gred_offload_dump_stats(struct Qdisc *sch)
@@ -731,6 +733,7 @@ static int gred_change(struct Qdisc *sch, struct nlattr *opt,
static int gred_init(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
+ struct gred_sched *table = qdisc_priv(sch);
struct nlattr *tb[TCA_GRED_MAX + 1];
int err;

@@ -754,6 +757,12 @@ static int gred_init(struct Qdisc *sch, struct nlattr *opt,
sch->limit = qdisc_dev(sch)->tx_queue_len
* psched_mtu(qdisc_dev(sch));

+ if (qdisc_dev(sch)->netdev_ops->ndo_setup_tc) {
+ table->opt = kzalloc(sizeof(*table->opt), GFP_KERNEL);
+ if (!table->opt)
+ return -ENOMEM;
+ }
+
return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
}

@@ -910,6 +919,7 @@ static void gred_destroy(struct Qdisc *sch)
gred_destroy_vq(table->tab[i]);
}
gred_offload(sch, TC_GRED_DESTROY);
+ kfree(table->opt);
}

static struct Qdisc_ops gred_qdisc_ops __read_mostly = {
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