Date:   Mon, 19 Aug 2019 13:03:51 +0200
From:   Alexander Dahl <ada@...rsis.com>
To:     linux-rt-users@...r.kernel.org
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [ANNOUNCE] v5.2.9-rt3

Hei hei,

just tried to compile this v5.2.9-rt3 for SAMA5D27-SOM1-EK1 based on 
arch/arm/configs/sama5_defconfig and with running oldconfig and selecting 
defaults, but that fails if CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK is not set. 

I think this is due to changes for Atmel TCLIB in v5.2 and the not yet adapted 
RT patch "clocksource: TCLIB: Allow higher clock rates for clock events", 
right?

What's the recommended setting of this option for RT?

See compiler output below.

Greets
Alex

----------------------
target: kernel.compile
----------------------

make[1]: Entering directory '/mnt/data/adahl/src/DistroKit/platform-v7a/build-
target/linux-5.2.9'
  CALL    scripts/atomic/check-atomics.sh
  CALL    scripts/checksyscalls.sh
  GEN     usr/initramfs_data.cpio
  CHK     include/generated/compile.h
  AS      usr/initramfs_data.o
  AR      usr/built-in.a
  CC      drivers/clocksource/timer-atmel-tcb.o
  AR      drivers/crypto/hisilicon/built-in.a
  CC      drivers/crypto/atmel-aes.o
drivers/clocksource/timer-atmel-tcb.c: In function 'tcb_clksrc_init':
drivers/clocksource/timer-atmel-tcb.c:485:24: error: incompatible type for 
argument 1 of 'setup_clkevents'
drivers/clocksource/timer-atmel-tcb.c:268:19: note: expected 'struct atmel_tc 
*' but argument is of type 'struct atmel_tc'
scripts/Makefile.build:278: recipe for target 'drivers/clocksource/timer-
atmel-tcb.o' failed
make[3]: *** [drivers/clocksource/timer-atmel-tcb.o] Error 1
make[2]: *** [drivers/clocksource] Error 2
make[2]: *** Waiting for unfinished jobs....
scripts/Makefile.build:489: recipe for target 'drivers/clocksource' failed
  CC      drivers/crypto/atmel-sha.o
  CC      drivers/crypto/atmel-tdes.o
  AR      drivers/crypto/built-in.a
Makefile:1073: recipe for target 'drivers' failed
make[1]: *** [drivers] Error 2
make[1]: Leaving directory '/mnt/data/adahl/src/DistroKit/platform-v7a/build-
target/linux-5.2.9'
/usr/local/lib/ptxdist-2019.01.0/rules/kernel.make:174: recipe for target '/
home/adahl/src/DistroKit/platform-v7a/state/kernel.compile' failed
make: *** [/home/adahl/src/DistroKit/platform-v7a/state/kernel.compile] Error 
2


Am Freitag, 16. August 2019, 17:36:16 CEST schrieb Sebastian Andrzej Siewior:
> Dear RT folks!
> 
> I'm pleased to announce the v5.2.9-rt3 patch set.
> 
> Changes since v5.2.9-rt2:
> 
>   - The exynos5 i2c controller disabled IRQ threading as reported by
>     Benjamin Rouxel. The hix5hd2 i2c controller did the same.
> 
>   - A timer related to the deadline scheduler now fires in hard-irq
>     context. Patch by Juri Lelli.
> 
>   - A lock used the x86's thermal exception uses a raw_spinlock_t. Patch
>     by Clark Williams.
> 
>   - The DMA-reservation code is using now a sequence lock instead a
>     sequence counter. Yann Collette reported warnings from that area
>     with an AMD GPU.
> 
>   - Two kvm related timer on arm64 expire now hard-irq context. Reported
>     by Julien Grall, patched by Thomas Gleixner.
> 
>   - Lazy preemption was broken in a case on arm64, reported by Paul
>     Thomas. While investigating another lazy-preempt bug was fixed on
>     arm64 and x86.
> 
> Known issues
>      - rcutorture is currently broken on -RT. Reported by Juri Lelli.
> 
> The delta patch against v5.2.9-rt2 is appended below and can be found here:
> 
>     
> https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.2/incr/patch-5.2.9-rt
> 2-rt3.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
> v5.2.9-rt3
> 
> The RT patch against v5.2.9 can be found here:
> 
>    
> https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patch-5.2.9-r
> t3.patch.xz
> 
> The split quilt queue is available at:
> 
>    
> https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.9
> -rt3.tar.xz
> 
> Sebastian
> 
> diff --git a/arch/arm64/include/asm/preempt.h
> b/arch/arm64/include/asm/preempt.h index 3bfad251203b5..ca1c6fe8dd347
> 100644
> --- a/arch/arm64/include/asm/preempt.h
> +++ b/arch/arm64/include/asm/preempt.h
> @@ -73,6 +73,8 @@ static inline bool __preempt_count_dec_and_test(void)
>  	if (!pc || !READ_ONCE(ti->preempt_count))
>  		return true;
>  #ifdef CONFIG_PREEMPT_LAZY
> +	if ((pc & ~PREEMPT_NEED_RESCHED))
> +		return false;
>  	if (current_thread_info()->preempt_lazy_count)
>  		return false;
>  	return test_thread_flag(TIF_NEED_RESCHED_LAZY);
> diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
> index aa16cb43a779e..5d651c560bba6 100644
> --- a/arch/arm64/kernel/entry.S
> +++ b/arch/arm64/kernel/entry.S
> @@ -680,7 +680,8 @@ alternative_if ARM64_HAS_IRQ_PRIO_MASKING
>  	orr	x24, x24, x0
>  alternative_else_nop_endif
> 
> -	cbnz	x24, 2f					// preempt count != 0
> +	cbz	x24, 1f					// (need_resched + count) == 0
> +	cbnz	w24, 2f					// count != 0
> 
>  	ldr	w24, [tsk, #TSK_TI_PREEMPT_LAZY]	// get preempt lazy count
>  	cbnz	w24, 2f					// preempt lazy count != 0
> diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h
> index f8e42abd874a4..9496299d23fc3 100644
> --- a/arch/x86/include/asm/preempt.h
> +++ b/arch/x86/include/asm/preempt.h
> @@ -99,6 +99,8 @@ static __always_inline bool
> __preempt_count_dec_and_test(void) if (____preempt_count_dec_and_test())
>  		return true;
>  #ifdef CONFIG_PREEMPT_LAZY
> +	if (preempt_count())
> +		return false;
>  	if (current_thread_info()->preempt_lazy_count)
>  		return false;
>  	return test_thread_flag(TIF_NEED_RESCHED_LAZY);
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index a6fee5a6e9fb2..27fffd65abe6b 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -168,7 +168,7 @@ static __poll_t dma_buf_poll(struct file *file,
> poll_table *poll) return 0;
> 
>  retry:
> -	seq = read_seqcount_begin(&resv->seq);
> +	seq = read_seqbegin(&resv->seq);
>  	rcu_read_lock();
> 
>  	fobj = rcu_dereference(resv->fence);
> @@ -177,7 +177,7 @@ static __poll_t dma_buf_poll(struct file *file,
> poll_table *poll) else
>  		shared_count = 0;
>  	fence_excl = rcu_dereference(resv->fence_excl);
> -	if (read_seqcount_retry(&resv->seq, seq)) {
> +	if (read_seqretry(&resv->seq, seq)) {
>  		rcu_read_unlock();
>  		goto retry;
>  	}
> @@ -1034,12 +1034,12 @@ static int dma_buf_debug_show(struct seq_file *s,
> void *unused)
> 
>  		robj = buf_obj->resv;
>  		while (true) {
> -			seq = read_seqcount_begin(&robj->seq);
> +			seq = read_seqbegin(&robj->seq);
>  			rcu_read_lock();
>  			fobj = rcu_dereference(robj->fence);
>  			shared_count = fobj ? fobj->shared_count : 0;
>  			fence = rcu_dereference(robj->fence_excl);
> -			if (!read_seqcount_retry(&robj->seq, seq))
> +			if (!read_seqretry(&robj->seq, seq))
>  				break;
>  			rcu_read_unlock();
>  		}
> diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c
> index 4447e13d1e891..030c45ad3e56a 100644
> --- a/drivers/dma-buf/reservation.c
> +++ b/drivers/dma-buf/reservation.c
> @@ -110,15 +110,13 @@ int reservation_object_reserve_shared(struct
> reservation_object *obj, new->shared_count = j;
>  	new->shared_max = max;
> 
> -	preempt_disable();
> -	write_seqcount_begin(&obj->seq);
> +	write_seqlock(&obj->seq);
>  	/*
>  	 * RCU_INIT_POINTER can be used here,
>  	 * seqcount provides the necessary barriers
>  	 */
>  	RCU_INIT_POINTER(obj->fence, new);
> -	write_seqcount_end(&obj->seq);
> -	preempt_enable();
> +	write_sequnlock(&obj->seq);
> 
>  	if (!old)
>  		return 0;
> @@ -158,8 +156,7 @@ void reservation_object_add_shared_fence(struct
> reservation_object *obj, fobj = reservation_object_get_list(obj);
>  	count = fobj->shared_count;
> 
> -	preempt_disable();
> -	write_seqcount_begin(&obj->seq);
> +	write_seqlock(&obj->seq);
> 
>  	for (i = 0; i < count; ++i) {
>  		struct dma_fence *old_fence;
> @@ -181,8 +178,7 @@ void reservation_object_add_shared_fence(struct
> reservation_object *obj, /* pointer update must be visible before we extend
> the shared_count */ smp_store_mb(fobj->shared_count, count);
> 
> -	write_seqcount_end(&obj->seq);
> -	preempt_enable();
> +	write_sequnlock(&obj->seq);
>  }
>  EXPORT_SYMBOL(reservation_object_add_shared_fence);
> 
> @@ -209,14 +205,11 @@ void reservation_object_add_excl_fence(struct
> reservation_object *obj, if (fence)
>  		dma_fence_get(fence);
> 
> -	preempt_disable();
> -	write_seqcount_begin(&obj->seq);
> -	/* write_seqcount_begin provides the necessary memory barrier */
> +	write_seqlock(&obj->seq);
>  	RCU_INIT_POINTER(obj->fence_excl, fence);
>  	if (old)
>  		old->shared_count = 0;
> -	write_seqcount_end(&obj->seq);
> -	preempt_enable();
> +	write_sequnlock(&obj->seq);
> 
>  	/* inplace update, no shared fences */
>  	while (i--)
> @@ -298,13 +291,10 @@ int reservation_object_copy_fences(struct
> reservation_object *dst, src_list = reservation_object_get_list(dst);
>  	old = reservation_object_get_excl(dst);
> 
> -	preempt_disable();
> -	write_seqcount_begin(&dst->seq);
> -	/* write_seqcount_begin provides the necessary memory barrier */
> +	write_seqlock(&dst->seq);
>  	RCU_INIT_POINTER(dst->fence_excl, new);
>  	RCU_INIT_POINTER(dst->fence, dst_list);
> -	write_seqcount_end(&dst->seq);
> -	preempt_enable();
> +	write_sequnlock(&dst->seq);
> 
>  	if (src_list)
>  		kfree_rcu(src_list, rcu);
> @@ -345,7 +335,7 @@ int reservation_object_get_fences_rcu(struct
> reservation_object *obj, shared_count = i = 0;
> 
>  		rcu_read_lock();
> -		seq = read_seqcount_begin(&obj->seq);
> +		seq = read_seqbegin(&obj->seq);
> 
>  		fence_excl = rcu_dereference(obj->fence_excl);
>  		if (fence_excl && !dma_fence_get_rcu(fence_excl))
> @@ -394,7 +384,7 @@ int reservation_object_get_fences_rcu(struct
> reservation_object *obj, }
>  		}
> 
> -		if (i != shared_count || read_seqcount_retry(&obj->seq, seq)) {
> +		if (i != shared_count || read_seqretry(&obj->seq, seq)) {
>  			while (i--)
>  				dma_fence_put(shared[i]);
>  			dma_fence_put(fence_excl);
> @@ -443,7 +433,7 @@ long reservation_object_wait_timeout_rcu(struct
> reservation_object *obj,
> 
>  retry:
>  	shared_count = 0;
> -	seq = read_seqcount_begin(&obj->seq);
> +	seq = read_seqbegin(&obj->seq);
>  	rcu_read_lock();
>  	i = -1;
> 
> @@ -490,7 +480,7 @@ long reservation_object_wait_timeout_rcu(struct
> reservation_object *obj,
> 
>  	rcu_read_unlock();
>  	if (fence) {
> -		if (read_seqcount_retry(&obj->seq, seq)) {
> +		if (read_seqretry(&obj->seq, seq)) {
>  			dma_fence_put(fence);
>  			goto retry;
>  		}
> @@ -546,7 +536,7 @@ bool reservation_object_test_signaled_rcu(struct
> reservation_object *obj, retry:
>  	ret = true;
>  	shared_count = 0;
> -	seq = read_seqcount_begin(&obj->seq);
> +	seq = read_seqbegin(&obj->seq);
> 
>  	if (test_all) {
>  		unsigned i;
> @@ -567,7 +557,7 @@ bool reservation_object_test_signaled_rcu(struct
> reservation_object *obj, break;
>  		}
> 
> -		if (read_seqcount_retry(&obj->seq, seq))
> +		if (read_seqretry(&obj->seq, seq))
>  			goto retry;
>  	}
> 
> @@ -580,7 +570,7 @@ bool reservation_object_test_signaled_rcu(struct
> reservation_object *obj, if (ret < 0)
>  				goto retry;
> 
> -			if (read_seqcount_retry(&obj->seq, seq))
> +			if (read_seqretry(&obj->seq, seq))
>  				goto retry;
>  		}
>  	}
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c index
> 4b192e0ce92f4..be625817e5d95 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -250,11 +250,9 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct
> amdgpu_bo *bo, new->shared_count = k;
> 
>  	/* Install the new fence list, seqcount provides the barriers */
> -	preempt_disable();
> -	write_seqcount_begin(&resv->seq);
> +	write_seqlock(&resv->seq);
>  	RCU_INIT_POINTER(resv->fence, new);
> -	write_seqcount_end(&resv->seq);
> -	preempt_enable();
> +	write_sequnlock(&resv->seq);
> 
>  	/* Drop the references to the removed fences or move them to ef_list */
>  	for (i = j, k = 0; i < old->shared_count; ++i) {
> diff --git a/drivers/gpu/drm/i915/i915_gem.c
> b/drivers/gpu/drm/i915/i915_gem.c index ad01c92aaf748..2910a133077a3 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -449,7 +449,7 @@ i915_gem_object_wait_reservation(struct
> reservation_object *resv, unsigned int flags,
>  				 long timeout)
>  {
> -	unsigned int seq = __read_seqcount_begin(&resv->seq);
> +	unsigned int seq = read_seqbegin(&resv->seq);
>  	struct dma_fence *excl;
>  	bool prune_fences = false;
> 
> @@ -500,9 +500,9 @@ i915_gem_object_wait_reservation(struct
> reservation_object *resv, * signaled and that the reservation object has
> not been changed (i.e. * no new fences have been added).
>  	 */
> -	if (prune_fences && !__read_seqcount_retry(&resv->seq, seq)) {
> +	if (prune_fences && !read_seqretry(&resv->seq, seq)) {
>  		if (reservation_object_trylock(resv)) {
> -			if (!__read_seqcount_retry(&resv->seq, seq))
> +			if (!read_seqretry(&resv->seq, seq))
>  				reservation_object_add_excl_fence(resv, NULL);
>  			reservation_object_unlock(resv);
>  		}
> @@ -3943,7 +3943,7 @@ i915_gem_busy_ioctl(struct drm_device *dev, void
> *data, *
>  	 */
>  retry:
> -	seq = raw_read_seqcount(&obj->resv->seq);
> +	seq = read_seqbegin(&obj->resv->seq);
> 
>  	/* Translate the exclusive fence to the READ *and* WRITE engine */
>  	args->busy = busy_check_writer(rcu_dereference(obj->resv->fence_excl));
> @@ -3961,7 +3961,7 @@ i915_gem_busy_ioctl(struct drm_device *dev, void
> *data, }
>  	}
> 
> -	if (args->busy && read_seqcount_retry(&obj->resv->seq, seq))
> +	if (args->busy && read_seqretry(&obj->resv->seq, seq))
>  		goto retry;
> 
>  	err = 0;
> diff --git a/drivers/i2c/busses/i2c-exynos5.c
> b/drivers/i2c/busses/i2c-exynos5.c index e4e7932f78000..e7514c16b756c
> 100644
> --- a/drivers/i2c/busses/i2c-exynos5.c
> +++ b/drivers/i2c/busses/i2c-exynos5.c
> @@ -791,9 +791,7 @@ static int exynos5_i2c_probe(struct platform_device
> *pdev) }
> 
>  	ret = devm_request_irq(&pdev->dev, i2c->irq, exynos5_i2c_irq,
> -				IRQF_NO_SUSPEND | IRQF_ONESHOT,
> -				dev_name(&pdev->dev), i2c);
> -
> +			       IRQF_NO_SUSPEND, dev_name(&pdev->dev), i2c);
>  	if (ret != 0) {
>  		dev_err(&pdev->dev, "cannot request HS-I2C IRQ %d\n", i2c->irq);
>  		goto err_clk;
> diff --git a/drivers/i2c/busses/i2c-hix5hd2.c
> b/drivers/i2c/busses/i2c-hix5hd2.c index 4df1434b3597d..8497c7a95dd44
> 100644
> --- a/drivers/i2c/busses/i2c-hix5hd2.c
> +++ b/drivers/i2c/busses/i2c-hix5hd2.c
> @@ -445,8 +445,7 @@ static int hix5hd2_i2c_probe(struct platform_device
> *pdev) hix5hd2_i2c_init(priv);
> 
>  	ret = devm_request_irq(&pdev->dev, irq, hix5hd2_i2c_irq,
> -			       IRQF_NO_SUSPEND | IRQF_ONESHOT,
> -			       dev_name(&pdev->dev), priv);
> +			       IRQF_NO_SUSPEND, dev_name(&pdev->dev), priv);
>  	if (ret != 0) {
>  		dev_err(&pdev->dev, "cannot request HS-I2C IRQ %d\n", irq);
>  		goto err_clk;
> diff --git a/drivers/thermal/intel/x86_pkg_temp_thermal.c
> b/drivers/thermal/intel/x86_pkg_temp_thermal.c index
> 319b771261686..92ceed3de6f39 100644
> --- a/drivers/thermal/intel/x86_pkg_temp_thermal.c
> +++ b/drivers/thermal/intel/x86_pkg_temp_thermal.c
> @@ -63,7 +63,7 @@ static int max_packages __read_mostly;
>  /* Array of package pointers */
>  static struct pkg_device **packages;
>  /* Serializes interrupt notification, work and hotplug */
> -static DEFINE_SPINLOCK(pkg_temp_lock);
> +static DEFINE_RAW_SPINLOCK(pkg_temp_lock);
>  /* Protects zone operation in the work function against hotplug removal */
>  static DEFINE_MUTEX(thermal_zone_mutex);
> 
> @@ -279,12 +279,12 @@ static void pkg_temp_thermal_threshold_work_fn(struct
> work_struct *work) u64 msr_val, wr_val;
> 
>  	mutex_lock(&thermal_zone_mutex);
> -	spin_lock_irq(&pkg_temp_lock);
> +	raw_spin_lock_irq(&pkg_temp_lock);
>  	++pkg_work_cnt;
> 
>  	pkgdev = pkg_temp_thermal_get_dev(cpu);
>  	if (!pkgdev) {
> -		spin_unlock_irq(&pkg_temp_lock);
> +		raw_spin_unlock_irq(&pkg_temp_lock);
>  		mutex_unlock(&thermal_zone_mutex);
>  		return;
>  	}
> @@ -298,7 +298,7 @@ static void pkg_temp_thermal_threshold_work_fn(struct
> work_struct *work) }
> 
>  	enable_pkg_thres_interrupt();
> -	spin_unlock_irq(&pkg_temp_lock);
> +	raw_spin_unlock_irq(&pkg_temp_lock);
> 
>  	/*
>  	 * If tzone is not NULL, then thermal_zone_mutex will prevent the
> @@ -323,7 +323,7 @@ static int pkg_thermal_notify(u64 msr_val)
>  	struct pkg_device *pkgdev;
>  	unsigned long flags;
> 
> -	spin_lock_irqsave(&pkg_temp_lock, flags);
> +	raw_spin_lock_irqsave(&pkg_temp_lock, flags);
>  	++pkg_interrupt_cnt;
> 
>  	disable_pkg_thres_interrupt();
> @@ -335,7 +335,7 @@ static int pkg_thermal_notify(u64 msr_val)
>  		pkg_thermal_schedule_work(pkgdev->cpu, &pkgdev->work);
>  	}
> 
> -	spin_unlock_irqrestore(&pkg_temp_lock, flags);
> +	raw_spin_unlock_irqrestore(&pkg_temp_lock, flags);
>  	return 0;
>  }
> 
> @@ -381,9 +381,9 @@ static int pkg_temp_thermal_device_add(unsigned int cpu)
> pkgdev->msr_pkg_therm_high);
> 
>  	cpumask_set_cpu(cpu, &pkgdev->cpumask);
> -	spin_lock_irq(&pkg_temp_lock);
> +	raw_spin_lock_irq(&pkg_temp_lock);
>  	packages[pkgid] = pkgdev;
> -	spin_unlock_irq(&pkg_temp_lock);
> +	raw_spin_unlock_irq(&pkg_temp_lock);
>  	return 0;
>  }
> 
> @@ -420,7 +420,7 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
>  	}
> 
>  	/* Protect against work and interrupts */
> -	spin_lock_irq(&pkg_temp_lock);
> +	raw_spin_lock_irq(&pkg_temp_lock);
> 
>  	/*
>  	 * Check whether this cpu was the current target and store the new
> @@ -452,9 +452,9 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
>  		 * To cancel the work we need to drop the lock, otherwise
>  		 * we might deadlock if the work needs to be flushed.
>  		 */
> -		spin_unlock_irq(&pkg_temp_lock);
> +		raw_spin_unlock_irq(&pkg_temp_lock);
>  		cancel_delayed_work_sync(&pkgdev->work);
> -		spin_lock_irq(&pkg_temp_lock);
> +		raw_spin_lock_irq(&pkg_temp_lock);
>  		/*
>  		 * If this is not the last cpu in the package and the work
>  		 * did not run after we dropped the lock above, then we
> @@ -465,7 +465,7 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
>  			pkg_thermal_schedule_work(target, &pkgdev->work);
>  	}
> 
> -	spin_unlock_irq(&pkg_temp_lock);
> +	raw_spin_unlock_irq(&pkg_temp_lock);
> 
>  	/* Final cleanup if this is the last cpu */
>  	if (lastcpu)
> diff --git a/include/linux/reservation.h b/include/linux/reservation.h
> index ee750765cc941..11cc05f489365 100644
> --- a/include/linux/reservation.h
> +++ b/include/linux/reservation.h
> @@ -71,7 +71,7 @@ struct reservation_object_list {
>   */
>  struct reservation_object {
>  	struct ww_mutex lock;
> -	seqcount_t seq;
> +	seqlock_t seq;
> 
>  	struct dma_fence __rcu *fence_excl;
>  	struct reservation_object_list __rcu *fence;
> @@ -90,7 +90,7 @@ reservation_object_init(struct reservation_object *obj)
>  {
>  	ww_mutex_init(&obj->lock, &reservation_ww_class);
> 
> -	__seqcount_init(&obj->seq, reservation_seqcount_string,
> &reservation_seqcount_class); +	seqlock_init(&obj->seq);
>  	RCU_INIT_POINTER(obj->fence, NULL);
>  	RCU_INIT_POINTER(obj->fence_excl, NULL);
>  }
> diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
> index c18be51f76088..1758f2a2d775a 100644
> --- a/kernel/sched/deadline.c
> +++ b/kernel/sched/deadline.c
> @@ -287,7 +287,7 @@ static void task_non_contending(struct task_struct *p)
> 
>  	dl_se->dl_non_contending = 1;
>  	get_task_struct(p);
> -	hrtimer_start(timer, ns_to_ktime(zerolag_time), HRTIMER_MODE_REL);
> +	hrtimer_start(timer, ns_to_ktime(zerolag_time), HRTIMER_MODE_REL_HARD);
>  }
> 
>  static void task_contending(struct sched_dl_entity *dl_se, int flags)
> @@ -1292,7 +1292,7 @@ void init_dl_inactive_task_timer(struct
> sched_dl_entity *dl_se) {
>  	struct hrtimer *timer = &dl_se->inactive_timer;
> 
> -	hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
> +	hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
>  	timer->function = inactive_task_timer;
>  }
> 
> diff --git a/localversion-rt b/localversion-rt
> index c3054d08a1129..1445cd65885cd 100644
> --- a/localversion-rt
> +++ b/localversion-rt
> @@ -1 +1 @@
> --rt2
> +-rt3
> diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
> index 1be486d5d7cb4..0bfa7c5b5c890 100644
> --- a/virt/kvm/arm/arch_timer.c
> +++ b/virt/kvm/arm/arch_timer.c
> @@ -80,7 +80,7 @@ static inline bool userspace_irqchip(struct kvm *kvm)
>  static void soft_timer_start(struct hrtimer *hrt, u64 ns)
>  {
>  	hrtimer_start(hrt, ktime_add_ns(ktime_get(), ns),
> -		      HRTIMER_MODE_ABS);
> +		      HRTIMER_MODE_ABS_HARD);
>  }
> 
>  static void soft_timer_cancel(struct hrtimer *hrt)
> @@ -697,11 +697,11 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
>  	update_vtimer_cntvoff(vcpu, kvm_phys_timer_read());
>  	ptimer->cntvoff = 0;
> 
> -	hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
> +	hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
>  	timer->bg_timer.function = kvm_bg_timer_expire;
> 
> -	hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
> -	hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
> +	hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
> +	hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
>  	vtimer->hrtimer.function = kvm_hrtimer_expire;
>  	ptimer->hrtimer.function = kvm_hrtimer_expire;

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