Dear RT folks!
I'm pleased to announce the v4.19.8-rt6 patch set.
Changes since v4.19.8-rt5:
- Move a state change in do_nanosleep() do avoid a warning in
hrtimer_cancel().
- Disable tracing events on i915. The tracing events are using
spin_locks() which is not working on -RT. Reported by Luca Abeni.
- A recently added preemption check on x86 in __flush_tlb_all()
triggers on RT. Disabling preemption to get similar environment like
in !RT.
- A bugfix in __fpu__restore_sig() on x86 requires extra care on RT.
Known issues
- A warning triggered in "rcu_note_context_switch" originated from
SyS_timer_gettime(). The issue was always there, it is now
visible. Reported by Grygorii Strashko and Daniel Wagner.
The delta patch against v4.19.8-rt5 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.19/incr/patch-4.19.8-rt5-rt6.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
v4.19.8-rt6
The RT patch against v4.19.8 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patch-4.19.8-rt6.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.8-rt6.tar.xz
Sebastian
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index d99a8ee9e185e..5e0274a941333 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -344,10 +344,12 @@ static int __fpu__restore_sig(void __user *buf, void
__user *buf_fx, int size)
sanitize_restored_xstate(tsk, &env, xfeatures, fx_only);
}
+ preempt_disable();
local_bh_disable();
fpu->initialized = 1;
fpu__restore(fpu);
local_bh_enable();
+ preempt_enable();
return err;
} else {
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index e2d4b25c7aa44..9626ebb9e3c84 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -687,12 +687,18 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte,
unsigned long address,
pgprot_t ref_prot;
spin_lock(&pgd_lock);
+ /*
+ * Keep preemption disabled after __flush_tlb_all() which expects not be
+ * preempted during the flush of the local TLB.
+ */
+ preempt_disable();
/*
* Check for races, another CPU might have split this page
* up for us already:
*/
tmp = _lookup_address_cpa(cpa, address, &level);
if (tmp != kpte) {
+ preempt_enable();
spin_unlock(&pgd_lock);
return 1;
}
@@ -726,6 +732,7 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte,
unsigned long address,
break;
default:
+ preempt_enable();
spin_unlock(&pgd_lock);
return 1;
}
@@ -764,6 +771,7 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte,
unsigned long address,
* going on.
*/
__flush_tlb_all();
+ preempt_enable();
spin_unlock(&pgd_lock);
return 0;
diff --git a/drivers/gpu/drm/i915/i915_trace.h
b/drivers/gpu/drm/i915/i915_trace.h
index b50c6b829715e..cc54ec0ef75c1 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -2,6 +2,10 @@
#if !defined(_I915_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
#define _I915_TRACE_H_
+#ifdef CONFIG_PREEMPT_RT_BASE
+#define NOTRACE
+#endif
+
#include <linux/stringify.h>
#include <linux/types.h>
#include <linux/tracepoint.h>
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index bf0ec3fbbe797..851b2134e77f4 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1785,12 +1785,12 @@ static int __sched do_nanosleep(struct hrtimer_sleeper
*t, enum hrtimer_mode mod
if (likely(t->task))
freezable_schedule();
+ __set_current_state(TASK_RUNNING);
hrtimer_cancel(&t->timer);
mode = HRTIMER_MODE_ABS;
} while (t->task && !signal_pending(current));
- __set_current_state(TASK_RUNNING);
if (!t->task)
return 0;
diff --git a/localversion-rt b/localversion-rt
index 0efe7ba1930e1..8fc605d806670 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt5
+-rt6
