9 files changed, 34 insertions, 18 deletions

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index ba54c44a64e2..7b587f8d5aa5 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -81,11 +81,12 @@ EXPORT_SYMBOL_GPL(hv_remove_vmbus_handler);
 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);
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index 722fd712e1cf..82cc3a7be6bd 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -141,7 +141,7 @@ recursion_check:
 	 */
 	if (visit_mask) {
 		if (*visit_mask & (1UL << info->type)) {
-			printk_deferred_once(KERN_WARNING "WARNING: stack recursion on stack type %d\n", info->type);
+			pr_warn_once("WARNING: stack recursion on stack type %d\n", info->type);
 			goto unknown;
 		}
 		*visit_mask |= 1UL << info->type;
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 6c5defd6569a..5f725b0ceb29 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -207,7 +207,8 @@ int get_stack_info(unsigned long *stack, struct task_struct *task,
 	if (visit_mask) {
 		if (*visit_mask & (1UL << info->type)) {
 			if (task == current)
-				printk_deferred_once(KERN_WARNING "WARNING: stack recursion on stack type %d\n", info->type);
+				pr_warn_once("WARNING: stack recursion on stack type %d\n",
+					     info->type);
 			goto unknown;
 		}
 		*visit_mask |= 1UL << info->type;
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 7ada7bd03a32..e17fe40ee51e 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -185,6 +185,18 @@ void kernel_fpu_end(void)
 }
 EXPORT_SYMBOL_GPL(kernel_fpu_end);
 
+void kernel_fpu_resched(void)
+{
+	WARN_ON_FPU(!this_cpu_read(in_kernel_fpu));
+
+	if (should_resched(PREEMPT_OFFSET)) {
+		kernel_fpu_end();
+		cond_resched();
+		kernel_fpu_begin();
+	}
+}
+EXPORT_SYMBOL_GPL(kernel_fpu_resched);
+
 /*
  * Sync the FPU register state to current's memory register state when the
  * current task owns the FPU. The hardware register state is preserved.
diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index 282b4ee1339f..161bcf35014d 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -207,8 +207,7 @@ spurious_8259A_irq:
 		 * lets ACK and report it. [once per IRQ]
 		 */
 		if (!(spurious_irq_mask & irqmask)) {
-			printk_deferred(KERN_DEBUG
-			       "spurious 8259A interrupt: IRQ%d.\n", irq);
+			printk(KERN_DEBUG "spurious 8259A interrupt: IRQ%d.\n", irq);
 			spurious_irq_mask |= irqmask;
 		}
 		atomic_inc(&irq_err_count);
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 044902d5a3c4..e5dd6da78713 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -132,6 +132,7 @@ int irq_init_percpu_irqstack(unsigned int cpu)
 	return 0;
 }
 
+#ifndef CONFIG_PREEMPT_RT
 void do_softirq_own_stack(void)
 {
 	struct irq_stack *irqstk;
@@ -148,6 +149,7 @@ void do_softirq_own_stack(void)
 
 	call_on_stack(__do_softirq, isp);
 }
+#endif
 
 void __handle_irq(struct irq_desc *desc, struct pt_regs *regs)
 {
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index 3a43a2dee658..37bd37cdf2b6 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -502,9 +502,12 @@ static int kgdb_nmi_handler(unsigned int cmd, struct pt_regs *regs)
 		if (atomic_read(&kgdb_active) != -1) {
 			/* KGDB CPU roundup */
 			cpu = raw_smp_processor_id();
-			kgdb_nmicallback(cpu, regs);
-			set_bit(cpu, was_in_debug_nmi);
-			touch_nmi_watchdog();
+
+			if (!kgdb_roundup_delay(cpu)) {
+				kgdb_nmicallback(cpu, regs);
+				set_bit(cpu, was_in_debug_nmi);
+				touch_nmi_watchdog();
+			}
 
 			return NMI_HANDLED;
 		}
diff --git a/arch/x86/kernel/unwind_frame.c b/arch/x86/kernel/unwind_frame.c
index d7c44b257f7f..2d0361cd304f 100644
--- a/arch/x86/kernel/unwind_frame.c
+++ b/arch/x86/kernel/unwind_frame.c
@@ -41,9 +41,9 @@ static void unwind_dump(struct unwind_state *state)
 
 	dumped_before = true;
 
-	printk_deferred("unwind stack type:%d next_sp:%p mask:0x%lx graph_idx:%d\n",
-			state->stack_info.type, state->stack_info.next_sp,
-			state->stack_mask, state->graph_idx);
+	printk("unwind stack type:%d next_sp:%p mask:0x%lx graph_idx:%d\n",
+	       state->stack_info.type, state->stack_info.next_sp,
+	       state->stack_mask, state->graph_idx);
 
 	for (sp = PTR_ALIGN(state->orig_sp, sizeof(long)); sp;
 	     sp = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
@@ -59,13 +59,11 @@ static void unwind_dump(struct unwind_state *state)
 
 			if (zero) {
 				if (!prev_zero)
-					printk_deferred("%p: %0*x ...\n",
-							sp, BITS_PER_LONG/4, 0);
+					printk("%p: %0*x ...\n", sp, BITS_PER_LONG/4, 0);
 				continue;
 			}
 
-			printk_deferred("%p: %0*lx (%pB)\n",
-					sp, BITS_PER_LONG/4, word, (void *)word);
+			printk("%p: %0*lx (%pB)\n", sp, BITS_PER_LONG/4, word, (void *)word);
 		}
 	}
 }
@@ -342,13 +340,13 @@ bad_address:
 		goto the_end;
 
 	if (state->regs) {
-		printk_deferred_once(KERN_WARNING
+		pr_warn_once(
 			"WARNING: kernel stack regs at %p in %s:%d has bad 'bp' value %p\n",
 			state->regs, state->task->comm,
 			state->task->pid, next_bp);
 		unwind_dump(state);
 	} else {
-		printk_deferred_once(KERN_WARNING
+		pr_warn_once(
 			"WARNING: kernel stack frame pointer at %p in %s:%d has bad value %p\n",
 			state->bp, state->task->comm,
 			state->task->pid, next_bp);
diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
index a1202536fc57..a26a7c3849f5 100644
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -9,7 +9,7 @@
 #include <asm/orc_lookup.h>
 
 #define orc_warn(fmt, ...) \
-	printk_deferred_once(KERN_WARNING "WARNING: " fmt, ##__VA_ARGS__)
+	pr_warn_once("WARNING: " fmt, ##__VA_ARGS__)
 
 #define orc_warn_current(args...)					\
 ({									\