[ANNOUNCE] v5.13-rt1

Dear RT folks!

I'm pleased to announce the v5.13-rt1 patch set.

Changes since v5.12-rc3-rt3:

  - Fast forward to v5.13

  - Rework of the locking core bits

  - Rework of large parts of the mm bits. Thanks to Mel Gorman and
    Vlastimil Babka for picking this up and polishing it with -mm
    wizardry.

  - The latest respin of the printk overhaul from John Ogness

  - Patch queue reordered

Known issues
  - config dependent build fails on ARM (also in plain v5.13)
  - netconsole triggers WARN.

You can get this release via the git tree at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v5.13-rt1

The RT patch against v5.13 can be found here:

  https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.13/patch-5.13-rt1.patch.xz

The split quilt queue is available at:

  https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.13/patches-5.13-rt1.tar.xz

Thanks,

	tglx

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 0 insertions, 166 deletions

diff --git a/patches/random-make-it-work-on-rt.patch b/patches/random-make-it-work-on-rt.patch
deleted file mode 100644
index f36de215d032..000000000000
--- a/patches/random-make-it-work-on-rt.patch
+++ /dev/null
@@ -1,166 +0,0 @@
-Subject: random: Make it work on rt
-From: Thomas Gleixner <tglx@linutronix.de>
-Date: Tue, 21 Aug 2012 20:38:50 +0200
-
-Delegate the random insertion to the forced threaded interrupt
-handler. Store the return IP of the hard interrupt handler in the irq
-descriptor and feed it into the random generator as a source of
-entropy.
-
-Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-
----
- arch/x86/kernel/cpu/mshyperv.c |    3 ++-
- drivers/char/random.c          |   11 +++++------
- drivers/hv/hyperv_vmbus.h      |    1 +
- drivers/hv/vmbus_drv.c         |    5 ++++-
- include/linux/irqdesc.h        |    1 +
- include/linux/random.h         |    2 +-
- kernel/irq/handle.c            |    8 +++++++-
- kernel/irq/manage.c            |    6 ++++++
- 8 files changed, 27 insertions(+), 10 deletions(-)
-
---- a/arch/x86/kernel/cpu/mshyperv.c
-+++ b/arch/x86/kernel/cpu/mshyperv.c
-@@ -85,11 +85,12 @@ EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq);
- DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_stimer0)
- {
- 	struct pt_regs *old_regs = set_irq_regs(regs);
-+	u64 ip = regs ? instruction_pointer(regs) : 0;
- 
- 	inc_irq_stat(hyperv_stimer0_count);
- 	if (hv_stimer0_handler)
- 		hv_stimer0_handler();
--	add_interrupt_randomness(HYPERV_STIMER0_VECTOR, 0);
-+	add_interrupt_randomness(HYPERV_STIMER0_VECTOR, 0, ip);
- 	ack_APIC_irq();
- 
- 	set_irq_regs(old_regs);
---- a/drivers/char/random.c
-+++ b/drivers/char/random.c
-@@ -1252,26 +1252,25 @@ static __u32 get_reg(struct fast_pool *f
- 	return *ptr;
- }
- 
--void add_interrupt_randomness(int irq, int irq_flags)
-+void add_interrupt_randomness(int irq, int irq_flags, __u64 ip)
- {
- 	struct entropy_store	*r;
- 	struct fast_pool	*fast_pool = this_cpu_ptr(&irq_randomness);
--	struct pt_regs		*regs = get_irq_regs();
- 	unsigned long		now = jiffies;
- 	cycles_t		cycles = random_get_entropy();
- 	__u32			c_high, j_high;
--	__u64			ip;
- 
- 	if (cycles == 0)
--		cycles = get_reg(fast_pool, regs);
-+		cycles = get_reg(fast_pool, NULL);
- 	c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0;
- 	j_high = (sizeof(now) > 4) ? now >> 32 : 0;
- 	fast_pool->pool[0] ^= cycles ^ j_high ^ irq;
- 	fast_pool->pool[1] ^= now ^ c_high;
--	ip = regs ? instruction_pointer(regs) : _RET_IP_;
-+	if (!ip)
-+		ip = _RET_IP_;
- 	fast_pool->pool[2] ^= ip;
- 	fast_pool->pool[3] ^= (sizeof(ip) > 4) ? ip >> 32 :
--		get_reg(fast_pool, regs);
-+		get_reg(fast_pool, NULL);
- 
- 	fast_mix(fast_pool);
- 	add_interrupt_bench(cycles);
---- a/drivers/hv/hyperv_vmbus.h
-+++ b/drivers/hv/hyperv_vmbus.h
-@@ -18,6 +18,7 @@
- #include <linux/atomic.h>
- #include <linux/hyperv.h>
- #include <linux/interrupt.h>
-+#include <linux/irq.h>
- 
- #include "hv_trace.h"
- 
---- a/drivers/hv/vmbus_drv.c
-+++ b/drivers/hv/vmbus_drv.c
-@@ -22,6 +22,7 @@
- #include <linux/clockchips.h>
- #include <linux/cpu.h>
- #include <linux/sched/task_stack.h>
-+#include <linux/irq.h>
- 
- #include <linux/delay.h>
- #include <linux/notifier.h>
-@@ -1337,6 +1338,8 @@ static void vmbus_isr(void)
- 	void *page_addr = hv_cpu->synic_event_page;
- 	struct hv_message *msg;
- 	union hv_synic_event_flags *event;
-+	struct pt_regs *regs = get_irq_regs();
-+	u64 ip = regs ? instruction_pointer(regs) : 0;
- 	bool handled = false;
- 
- 	if (unlikely(page_addr == NULL))
-@@ -1381,7 +1384,7 @@ static void vmbus_isr(void)
- 			tasklet_schedule(&hv_cpu->msg_dpc);
- 	}
- 
--	add_interrupt_randomness(hv_get_vector(), 0);
-+	add_interrupt_randomness(hv_get_vector(), 0, ip);
- }
- 
- /*
---- a/include/linux/irqdesc.h
-+++ b/include/linux/irqdesc.h
-@@ -68,6 +68,7 @@ struct irq_desc {
- 	unsigned int		irqs_unhandled;
- 	atomic_t		threads_handled;
- 	int			threads_handled_last;
-+	u64			random_ip;
- 	raw_spinlock_t		lock;
- 	struct cpumask		*percpu_enabled;
- 	const struct cpumask	*percpu_affinity;
---- a/include/linux/random.h
-+++ b/include/linux/random.h
-@@ -35,7 +35,7 @@ static inline void add_latent_entropy(vo
- 
- extern void add_input_randomness(unsigned int type, unsigned int code,
- 				 unsigned int value) __latent_entropy;
--extern void add_interrupt_randomness(int irq, int irq_flags) __latent_entropy;
-+extern void add_interrupt_randomness(int irq, int irq_flags, __u64 ip) __latent_entropy;
- 
- extern void get_random_bytes(void *buf, int nbytes);
- extern int wait_for_random_bytes(void);
---- a/kernel/irq/handle.c
-+++ b/kernel/irq/handle.c
-@@ -192,10 +192,16 @@ irqreturn_t handle_irq_event_percpu(stru
- {
- 	irqreturn_t retval;
- 	unsigned int flags = 0;
-+	struct pt_regs *regs = get_irq_regs();
-+	u64 ip = regs ? instruction_pointer(regs) : 0;
- 
- 	retval = __handle_irq_event_percpu(desc, &flags);
- 
--	add_interrupt_randomness(desc->irq_data.irq, flags);
-+#ifdef CONFIG_PREEMPT_RT
-+	desc->random_ip = ip;
-+#else
-+	add_interrupt_randomness(desc->irq_data.irq, flags, ip);
-+#endif
- 
- 	if (!noirqdebug)
- 		note_interrupt(desc, retval);
---- a/kernel/irq/manage.c
-+++ b/kernel/irq/manage.c
-@@ -1247,6 +1247,12 @@ static int irq_thread(void *data)
- 		if (action_ret == IRQ_WAKE_THREAD)
- 			irq_wake_secondary(desc, action);
- 
-+		if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
-+			migrate_disable();
-+			add_interrupt_randomness(action->irq, 0,
-+				 desc->random_ip ^ (unsigned long) action);
-+			migrate_enable();
-+		}
- 		wake_threads_waitq(desc);
- 	}
-