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Message-ID: <20240619152531.TtA4yAWo@linutronix.de>
Date: Wed, 19 Jun 2024 17:25:31 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>, linux-rt-users@...r.kernel.org,
Steven Rostedt <rostedt@...dmis.org>
Subject: [ANNOUNCE] v6.10-rc4-rt7
Dear RT folks!
I'm pleased to announce the v6.10-rc4-rt7 patch set.
Changes since v6.10-rc4-rt6:
- Update the net/BH series to the last version that has been posted.
- Update the i915 patches based on feedback.
Known issues
None.
The delta patch against v6.10-rc4-rt6 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.10/incr/patch-6.10-rc4-rt6-rt7.patch.xz
You can get this release via the git tree at:
https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v6.10-rc4-rt7
The RT patch against v6.10-rc4 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.10/older/patch-6.10-rc4-rt7.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.10/older/patches-6.10-rc4-rt7.tar.xz
Sebastian
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
index 2ca54bc235925..12cbf04990182 100644
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -273,7 +273,12 @@ wait_remaining_ms_from_jiffies(unsigned long timestamp_jiffies, int to_wait_ms)
(Wmax))
#define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000)
-/* If CONFIG_PREEMPT_COUNT is disabled, in_atomic() always reports false. */
+/*
+ * If CONFIG_PREEMPT_COUNT is disabled, in_atomic() always reports false.
+ * On PREEMPT_RT the context isn't becoming atomic because it is used in an
+ * interrupt handler or because a spinlock_t is acquired. This leads to
+ * warnings which don't occur otherwise and therefore the check is disabled.
+ */
#if defined(CONFIG_DRM_I915_DEBUG) && defined(CONFIG_PREEMPT_COUNT) && !defined(CONFIG_PREEMPT_RT)
# define _WAIT_FOR_ATOMIC_CHECK(ATOMIC) WARN_ON_ONCE((ATOMIC) && !in_atomic())
#else
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index f0ab89caf3cc2..883d55005362c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -43,6 +43,7 @@
#include <linux/netdev_features.h>
#include <linux/neighbour.h>
+#include <linux/netdevice_xmit.h>
#include <uapi/linux/netdevice.h>
#include <uapi/linux/if_bonding.h>
#include <uapi/linux/pkt_cls.h>
@@ -3223,15 +3224,7 @@ struct softnet_data {
struct sk_buff_head xfrm_backlog;
#endif
/* written and read only by owning cpu: */
- struct {
-#ifndef CONFIG_PREEMPT_RT
- u16 recursion;
-#endif
- u8 more;
-#ifdef CONFIG_NET_EGRESS
- u8 skip_txqueue;
-#endif
- } xmit;
+ struct netdev_xmit xmit;
#ifdef CONFIG_RPS
/* input_queue_head should be written by cpu owning this struct,
* and only read by other cpus. Worth using a cache line.
@@ -3259,18 +3252,17 @@ struct softnet_data {
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
-#ifdef CONFIG_PREEMPT_RT
-static inline int dev_recursion_level(void)
-{
- return current->net_xmit_recursion;
-}
-
-#else
-
+#ifndef CONFIG_PREEMPT_RT
static inline int dev_recursion_level(void)
{
return this_cpu_read(softnet_data.xmit.recursion);
}
+#else
+static inline int dev_recursion_level(void)
+{
+ return current->net_xmit.recursion;
+}
+
#endif
void __netif_schedule(struct Qdisc *q);
@@ -4886,18 +4878,35 @@ static inline ktime_t netdev_get_tstamp(struct net_device *dev,
return hwtstamps->hwtstamp;
}
-static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
- struct sk_buff *skb, struct net_device *dev,
- bool more)
+#ifndef CONFIG_PREEMPT_RT
+static inline void netdev_xmit_set_more(bool more)
{
__this_cpu_write(softnet_data.xmit.more, more);
- return ops->ndo_start_xmit(skb, dev);
}
static inline bool netdev_xmit_more(void)
{
return __this_cpu_read(softnet_data.xmit.more);
}
+#else
+static inline void netdev_xmit_set_more(bool more)
+{
+ current->net_xmit.more = more;
+}
+
+static inline bool netdev_xmit_more(void)
+{
+ return current->net_xmit.more;
+}
+#endif
+
+static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
+ struct sk_buff *skb, struct net_device *dev,
+ bool more)
+{
+ netdev_xmit_set_more(more);
+ return ops->ndo_start_xmit(skb, dev);
+}
static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
struct netdev_queue *txq, bool more)
diff --git a/include/linux/netdevice_xmit.h b/include/linux/netdevice_xmit.h
new file mode 100644
index 0000000000000..38325e0702968
--- /dev/null
+++ b/include/linux/netdevice_xmit.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _LINUX_NETDEVICE_XMIT_H
+#define _LINUX_NETDEVICE_XMIT_H
+
+struct netdev_xmit {
+ u16 recursion;
+ u8 more;
+#ifdef CONFIG_NET_EGRESS
+ u8 skip_txqueue;
+#endif
+};
+
+#endif
diff --git a/include/linux/sched.h b/include/linux/sched.h
index bd2a568b22d05..34c6169f631eb 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -36,6 +36,7 @@
#include <linux/signal_types.h>
#include <linux/syscall_user_dispatch_types.h>
#include <linux/mm_types_task.h>
+#include <linux/netdevice_xmit.h>
#include <linux/task_io_accounting.h>
#include <linux/posix-timers_types.h>
#include <linux/restart_block.h>
@@ -977,7 +978,7 @@ struct task_struct {
unsigned in_thrashing:1;
#endif
#ifdef CONFIG_PREEMPT_RT
- u8 net_xmit_recursion;
+ struct netdev_xmit net_xmit;
#endif
unsigned long atomic_flags; /* Flags requiring atomic access. */
diff --git a/localversion-rt b/localversion-rt
index 8fc605d806670..045478966e9f1 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt6
+-rt7
diff --git a/net/core/dev.c b/net/core/dev.c
index 85702022c5cd4..7d59afa862630 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3942,6 +3942,7 @@ netdev_tx_queue_mapping(struct net_device *dev, struct sk_buff *skb)
return netdev_get_tx_queue(dev, netdev_cap_txqueue(dev, qm));
}
+#ifndef CONFIG_PREEMPT_RT
static bool netdev_xmit_txqueue_skipped(void)
{
return __this_cpu_read(softnet_data.xmit.skip_txqueue);
@@ -3952,6 +3953,19 @@ void netdev_xmit_skip_txqueue(bool skip)
__this_cpu_write(softnet_data.xmit.skip_txqueue, skip);
}
EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue);
+
+#else
+static bool netdev_xmit_txqueue_skipped(void)
+{
+ return current->net_xmit.skip_txqueue;
+}
+
+void netdev_xmit_skip_txqueue(bool skip)
+{
+ current->net_xmit.skip_txqueue = skip;
+}
+EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue);
+#endif
#endif /* CONFIG_NET_EGRESS */
#ifdef CONFIG_NET_XGRESS
diff --git a/net/core/dev.h b/net/core/dev.h
index 2f96d63053ad0..4984dd9b334bc 100644
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -151,24 +151,7 @@ void kick_defer_list_purge(struct softnet_data *sd, unsigned int cpu);
#define XMIT_RECURSION_LIMIT 8
-#ifdef CONFIG_PREEMPT_RT
-static inline bool dev_xmit_recursion(void)
-{
- return unlikely(current->net_xmit_recursion > XMIT_RECURSION_LIMIT);
-}
-
-static inline void dev_xmit_recursion_inc(void)
-{
- current->net_xmit_recursion++;
-}
-
-static inline void dev_xmit_recursion_dec(void)
-{
- current->net_xmit_recursion--;
-}
-
-#else
-
+#ifndef CONFIG_PREEMPT_RT
static inline bool dev_xmit_recursion(void)
{
return unlikely(__this_cpu_read(softnet_data.xmit.recursion) >
@@ -184,6 +167,21 @@ static inline void dev_xmit_recursion_dec(void)
{
__this_cpu_dec(softnet_data.xmit.recursion);
}
+#else
+static inline bool dev_xmit_recursion(void)
+{
+ return unlikely(current->net_xmit.recursion > XMIT_RECURSION_LIMIT);
+}
+
+static inline void dev_xmit_recursion_inc(void)
+{
+ current->net_xmit.recursion++;
+}
+
+static inline void dev_xmit_recursion_dec(void)
+{
+ current->net_xmit.recursion--;
+}
#endif
#endif
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