[patch 0/8] core, x86: Preparatory steps for RT

[patch 0/8] core, x86: Preparatory steps for RT

[Thomas Gleixner]

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

The following series adjusts the core and x86 code to use
CONFIG_PREEMPTION where appropriate and extends the x86 dumpstack
implementation to display PREEMPT_RT instead of PREEMPT on a RT
enabled kernel.

Thanks,

	tglx

[patch 1/8] preempt: Use CONFIG_PREEMPTION where appropriate

[Thomas Gleixner]

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the preemption code, scheduler and init task over to use
CONFIG_PREEMPTION.

That's the first step towards RT in that area. The more complex changes are
coming separately.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 include/asm-generic/preempt.h |    4 ++--
 include/linux/preempt.h       |    6 +++---
 include/linux/sched.h         |    6 +++---
 init/init_task.c              |    2 +-
 init/main.c                   |    2 +-
 kernel/sched/core.c           |   14 +++++++-------
 kernel/sched/fair.c           |    2 +-
 kernel/sched/sched.h          |    4 ++--
 8 files changed, 20 insertions(+), 20 deletions(-)

--- a/include/asm-generic/preempt.h
+++ b/include/asm-generic/preempt.h
@@ -78,11 +78,11 @@ static __always_inline bool should_resch
 			tif_need_resched());
 }
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 extern asmlinkage void preempt_schedule(void);
 #define __preempt_schedule() preempt_schedule()
 extern asmlinkage void preempt_schedule_notrace(void);
 #define __preempt_schedule_notrace() preempt_schedule_notrace()
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 
 #endif /* __ASM_PREEMPT_H */
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -182,7 +182,7 @@ do { \
 
 #define preemptible()	(preempt_count() == 0 && !irqs_disabled())
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 #define preempt_enable() \
 do { \
 	barrier(); \
@@ -203,7 +203,7 @@ do { \
 		__preempt_schedule(); \
 } while (0)
 
-#else /* !CONFIG_PREEMPT */
+#else /* !CONFIG_PREEMPTION */
 #define preempt_enable() \
 do { \
 	barrier(); \
@@ -217,7 +217,7 @@ do { \
 } while (0)
 
 #define preempt_check_resched() do { } while (0)
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 
 #define preempt_disable_notrace() \
 do { \
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1759,7 +1759,7 @@ static inline int test_tsk_need_resched(
  * value indicates whether a reschedule was done in fact.
  * cond_resched_lock() will drop the spinlock before scheduling,
  */
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 extern int _cond_resched(void);
 #else
 static inline int _cond_resched(void) { return 0; }
@@ -1788,12 +1788,12 @@ static inline void cond_resched_rcu(void
 
 /*
  * Does a critical section need to be broken due to another
- * task waiting?: (technically does not depend on CONFIG_PREEMPT,
+ * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
  * but a general need for low latency)
  */
 static inline int spin_needbreak(spinlock_t *lock)
 {
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	return spin_is_contended(lock);
 #else
 	return 0;
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -174,7 +174,7 @@ struct task_struct init_task
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	.ret_stack	= NULL,
 #endif
-#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
+#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
 	.trace_recursion = 0,
 #endif
 #ifdef CONFIG_LIVEPATCH
--- a/init/main.c
+++ b/init/main.c
@@ -433,7 +433,7 @@ noinline void __ref rest_init(void)
 
 	/*
 	 * Enable might_sleep() and smp_processor_id() checks.
-	 * They cannot be enabled earlier because with CONFIG_PREEMPT=y
+	 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y
 	 * kernel_thread() would trigger might_sleep() splats. With
 	 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
 	 * already, but it's stuck on the kthreadd_done completion.
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3581,7 +3581,7 @@ static inline void sched_tick_start(int
 static inline void sched_tick_stop(int cpu) { }
 #endif
 
-#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
+#if defined(CONFIG_PREEMPTION) && (defined(CONFIG_DEBUG_PREEMPT) || \
 				defined(CONFIG_TRACE_PREEMPT_TOGGLE))
 /*
  * If the value passed in is equal to the current preempt count
@@ -3782,7 +3782,7 @@ pick_next_task(struct rq *rq, struct tas
  *      task, then the wakeup sets TIF_NEED_RESCHED and schedule() gets
  *      called on the nearest possible occasion:
  *
- *       - If the kernel is preemptible (CONFIG_PREEMPT=y):
+ *       - If the kernel is preemptible (CONFIG_PREEMPTION=y):
  *
  *         - in syscall or exception context, at the next outmost
  *           preempt_enable(). (this might be as soon as the wake_up()'s
@@ -3791,7 +3791,7 @@ pick_next_task(struct rq *rq, struct tas
  *         - in IRQ context, return from interrupt-handler to
  *           preemptible context
  *
- *       - If the kernel is not preemptible (CONFIG_PREEMPT is not set)
+ *       - If the kernel is not preemptible (CONFIG_PREEMPTION is not set)
  *         then at the next:
  *
  *          - cond_resched() call
@@ -4033,7 +4033,7 @@ static void __sched notrace preempt_sche
 	} while (need_resched());
 }
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 /*
  * this is the entry point to schedule() from in-kernel preemption
  * off of preempt_enable. Kernel preemptions off return from interrupt
@@ -4105,7 +4105,7 @@ asmlinkage __visible void __sched notrac
 }
 EXPORT_SYMBOL_GPL(preempt_schedule_notrace);
 
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 
 /*
  * this is the entry point to schedule() from kernel preemption
@@ -5416,7 +5416,7 @@ SYSCALL_DEFINE0(sched_yield)
 	return 0;
 }
 
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 int __sched _cond_resched(void)
 {
 	if (should_resched(0)) {
@@ -5433,7 +5433,7 @@ EXPORT_SYMBOL(_cond_resched);
  * __cond_resched_lock() - if a reschedule is pending, drop the given lock,
  * call schedule, and on return reacquire the lock.
  *
- * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
+ * This works OK both with and without CONFIG_PREEMPTION. We do strange low-level
  * operations here to prevent schedule() from being called twice (once via
  * spin_unlock(), once by hand).
  */
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7376,7 +7376,7 @@ static int detach_tasks(struct lb_env *e
 		detached++;
 		env->imbalance -= load;
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 		/*
 		 * NEWIDLE balancing is a source of latency, so preemptible
 		 * kernels will stop after the first task is detached to minimize
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1943,7 +1943,7 @@ unsigned long arch_scale_freq_capacity(i
 #endif
 
 #ifdef CONFIG_SMP
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 
 static inline void double_rq_lock(struct rq *rq1, struct rq *rq2);
 
@@ -1995,7 +1995,7 @@ static inline int _double_lock_balance(s
 	return ret;
 }
 
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 
 /*
  * double_lock_balance - lock the busiest runqueue, this_rq is locked already.

[patch 2/8] rcu: Use CONFIG_PREEMPTION

[Thomas Gleixner]

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the conditionals in RCU to use CONFIG_PREEMPTION.

That's the first step towards RCU on RT. The further tweaks are work in
progress. This neither touches the selftest bits which need a closer look
by Paul.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "Paul E. McKenney" <paulmck@linux.ibm.com>
---
 arch/Kconfig             |    2 +-
 include/linux/rcupdate.h |    2 +-
 include/linux/rcutree.h  |    2 +-
 include/linux/torture.h  |    2 +-
 kernel/rcu/Kconfig       |    8 ++++----
 kernel/rcu/tree.c        |    6 +++---
 kernel/rcu/tree_stall.h  |    6 +++---
 kernel/trace/Kconfig     |    2 +-
 8 files changed, 15 insertions(+), 15 deletions(-)

--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -103,7 +103,7 @@ config STATIC_KEYS_SELFTEST
 config OPTPROBES
 	def_bool y
 	depends on KPROBES && HAVE_OPTPROBES
-	select TASKS_RCU if PREEMPT
+	select TASKS_RCU if PREEMPTION
 
 config KPROBES_ON_FTRACE
 	def_bool y
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -578,7 +578,7 @@ do {									      \
  *
  * In non-preemptible RCU implementations (TREE_RCU and TINY_RCU),
  * it is illegal to block while in an RCU read-side critical section.
- * In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPT
+ * In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPTION
  * kernel builds, RCU read-side critical sections may be preempted,
  * but explicit blocking is illegal.  Finally, in preemptible RCU
  * implementations in real-time (with -rt patchset) kernel builds, RCU
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -53,7 +53,7 @@ void rcu_scheduler_starting(void);
 extern int rcu_scheduler_active __read_mostly;
 void rcu_end_inkernel_boot(void);
 bool rcu_is_watching(void);
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 void rcu_all_qs(void);
 #endif
 
--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -86,7 +86,7 @@ void _torture_stop_kthread(char *m, stru
 #define torture_stop_kthread(n, tp) \
 	_torture_stop_kthread("Stopping " #n " task", &(tp))
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 #define torture_preempt_schedule() preempt_schedule()
 #else
 #define torture_preempt_schedule()
--- a/kernel/rcu/Kconfig
+++ b/kernel/rcu/Kconfig
@@ -7,7 +7,7 @@ menu "RCU Subsystem"
 
 config TREE_RCU
 	bool
-	default y if !PREEMPT && SMP
+	default y if !PREEMPTION && SMP
 	help
 	  This option selects the RCU implementation that is
 	  designed for very large SMP system with hundreds or
@@ -16,7 +16,7 @@ config TREE_RCU
 
 config PREEMPT_RCU
 	bool
-	default y if PREEMPT
+	default y if PREEMPTION
 	help
 	  This option selects the RCU implementation that is
 	  designed for very large SMP systems with hundreds or
@@ -28,7 +28,7 @@ config PREEMPT_RCU
 
 config TINY_RCU
 	bool
-	default y if !PREEMPT && !SMP
+	default y if !PREEMPTION && !SMP
 	help
 	  This option selects the RCU implementation that is
 	  designed for UP systems from which real-time response
@@ -70,7 +70,7 @@ config TREE_SRCU
 	  This option selects the full-fledged version of SRCU.
 
 config TASKS_RCU
-	def_bool PREEMPT
+	def_bool PREEMPTION
 	select SRCU
 	help
 	  This option enables a task-based RCU implementation that uses
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1881,7 +1881,7 @@ rcu_report_unblock_qs_rnp(struct rcu_nod
 	struct rcu_node *rnp_p;
 
 	raw_lockdep_assert_held_rcu_node(rnp);
-	if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPT)) ||
+	if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPTION)) ||
 	    WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp)) ||
 	    rnp->qsmask != 0) {
 		raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
@@ -2205,7 +2205,7 @@ static void force_qs_rnp(int (*f)(struct
 		mask = 0;
 		raw_spin_lock_irqsave_rcu_node(rnp, flags);
 		if (rnp->qsmask == 0) {
-			if (!IS_ENABLED(CONFIG_PREEMPT) ||
+			if (!IS_ENABLED(CONFIG_PREEMPTION) ||
 			    rcu_preempt_blocked_readers_cgp(rnp)) {
 				/*
 				 * No point in scanning bits because they
@@ -2622,7 +2622,7 @@ static int rcu_blocking_is_gp(void)
 {
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PREEMPT))
+	if (IS_ENABLED(CONFIG_PREEMPTION))
 		return rcu_scheduler_active == RCU_SCHEDULER_INACTIVE;
 	might_sleep();  /* Check for RCU read-side critical section. */
 	preempt_disable();
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -163,7 +163,7 @@ static void rcu_iw_handler(struct irq_wo
 //
 // Printing RCU CPU stall warnings
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 
 /*
  * Dump detailed information for all tasks blocking the current RCU
@@ -215,7 +215,7 @@ static int rcu_print_task_stall(struct r
 	return ndetected;
 }
 
-#else /* #ifdef CONFIG_PREEMPT */
+#else /* #ifdef CONFIG_PREEMPTION */
 
 /*
  * Because preemptible RCU does not exist, we never have to check for
@@ -233,7 +233,7 @@ static int rcu_print_task_stall(struct r
 {
 	return 0;
 }
-#endif /* #else #ifdef CONFIG_PREEMPT */
+#endif /* #else #ifdef CONFIG_PREEMPTION */
 
 /*
  * Dump stacks of all tasks running on stalled CPUs.  First try using
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -146,7 +146,7 @@ config FUNCTION_TRACER
 	select GENERIC_TRACER
 	select CONTEXT_SWITCH_TRACER
 	select GLOB
-	select TASKS_RCU if PREEMPT
+	select TASKS_RCU if PREEMPTION
 	help
 	  Enable the kernel to trace every kernel function. This is done
 	  by using a compiler feature to insert a small, 5-byte No-Operation

[patch 3/8] locking: Use CONFIG_PREEMPTION

[Thomas Gleixner]

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Adjust the comments in the locking code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 include/linux/spinlock.h         |    2 +-
 include/linux/spinlock_api_smp.h |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -214,7 +214,7 @@ static inline void do_raw_spin_unlock(ra
 
 /*
  * Define the various spin_lock methods.  Note we define these
- * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The
+ * regardless of whether CONFIG_SMP or CONFIG_PREEMPTION are set. The
  * various methods are defined as nops in the case they are not
  * required.
  */
--- a/include/linux/spinlock_api_smp.h
+++ b/include/linux/spinlock_api_smp.h
@@ -96,7 +96,7 @@ static inline int __raw_spin_trylock(raw
 
 /*
  * If lockdep is enabled then we use the non-preemption spin-ops
- * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
+ * even on CONFIG_PREEMPTION, because lockdep assumes that interrupts are
  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
  */
 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)

[patch 4/8] tracing: Use CONFIG_PREEMPTION

[Thomas Gleixner]

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the conditionals in the tracer over to CONFIG_PREEMPTION.

This is the first step to make the tracer work on RT. The other small
tweaks are submitted separately.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/trace/Kconfig                 |    4 ++--
 kernel/trace/ftrace.c                |    2 +-
 kernel/trace/ring_buffer_benchmark.c |    2 +-
 kernel/trace/trace_events.c          |    4 ++--
 4 files changed, 6 insertions(+), 6 deletions(-)

--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -179,7 +179,7 @@ config TRACE_PREEMPT_TOGGLE
 config PREEMPTIRQ_EVENTS
 	bool "Enable trace events for preempt and irq disable/enable"
 	select TRACE_IRQFLAGS
-	select TRACE_PREEMPT_TOGGLE if PREEMPT
+	select TRACE_PREEMPT_TOGGLE if PREEMPTION
 	select GENERIC_TRACER
 	default n
 	help
@@ -214,7 +214,7 @@ config PREEMPT_TRACER
 	bool "Preemption-off Latency Tracer"
 	default n
 	depends on !ARCH_USES_GETTIMEOFFSET
-	depends on PREEMPT
+	depends on PREEMPTION
 	select GENERIC_TRACER
 	select TRACER_MAX_TRACE
 	select RING_BUFFER_ALLOW_SWAP
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2814,7 +2814,7 @@ int ftrace_shutdown(struct ftrace_ops *o
 		 * synchornize_rcu_tasks() will wait for those tasks to
 		 * execute and either schedule voluntarily or enter user space.
 		 */
-		if (IS_ENABLED(CONFIG_PREEMPT))
+		if (IS_ENABLED(CONFIG_PREEMPTION))
 			synchronize_rcu_tasks();
 
  free_ops:
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -267,7 +267,7 @@ static void ring_buffer_producer(void)
 		if (consumer && !(cnt % wakeup_interval))
 			wake_up_process(consumer);
 
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 		/*
 		 * If we are a non preempt kernel, the 10 second run will
 		 * stop everything while it runs. Instead, we will call
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -255,12 +255,12 @@ void *trace_event_buffer_reserve(struct
 	local_save_flags(fbuffer->flags);
 	fbuffer->pc = preempt_count();
 	/*
-	 * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables
+	 * If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables
 	 * preemption (adding one to the preempt_count). Since we are
 	 * interested in the preempt_count at the time the tracepoint was
 	 * hit, we need to subtract one to offset the increment.
 	 */
-	if (IS_ENABLED(CONFIG_PREEMPT))
+	if (IS_ENABLED(CONFIG_PREEMPTION))
 		fbuffer->pc--;
 	fbuffer->trace_file = trace_file;
 

[patch 5/8] kprobes: Use CONFIG_PREEMPTION

[Thomas Gleixner]

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch kprobes conditional over to CONFIG_PREEMPTION.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
---
 kernel/kprobes.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1906,7 +1906,7 @@ int register_kretprobe(struct kretprobe
 
 	/* Pre-allocate memory for max kretprobe instances */
 	if (rp->maxactive <= 0) {
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 		rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus());
 #else
 		rp->maxactive = num_possible_cpus();

[patch 6/8] x86: Use CONFIG_PREEMPTION

[Thomas Gleixner]

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the entry code, preempt and kprobes conditionals over to
CONFIG_PREEMPTION.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/entry/entry_32.S      |    6 +++---
 arch/x86/entry/entry_64.S      |    4 ++--
 arch/x86/entry/thunk_32.S      |    2 +-
 arch/x86/entry/thunk_64.S      |    4 ++--
 arch/x86/include/asm/preempt.h |    2 +-
 arch/x86/kernel/kprobes/core.c |    2 +-
 6 files changed, 10 insertions(+), 10 deletions(-)

--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -63,7 +63,7 @@
  * enough to patch inline, increasing performance.
  */
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 # define preempt_stop(clobbers)	DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF
 #else
 # define preempt_stop(clobbers)
@@ -1084,7 +1084,7 @@ ENTRY(entry_INT80_32)
 	INTERRUPT_RETURN
 
 restore_all_kernel:
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	DISABLE_INTERRUPTS(CLBR_ANY)
 	cmpl	$0, PER_CPU_VAR(__preempt_count)
 	jnz	.Lno_preempt
@@ -1364,7 +1364,7 @@ ENTRY(xen_hypervisor_callback)
 ENTRY(xen_do_upcall)
 1:	mov	%esp, %eax
 	call	xen_evtchn_do_upcall
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 	call	xen_maybe_preempt_hcall
 #endif
 	jmp	ret_from_intr
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -662,7 +662,7 @@ GLOBAL(swapgs_restore_regs_and_return_to
 
 /* Returning to kernel space */
 retint_kernel:
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	/* Interrupts are off */
 	/* Check if we need preemption */
 	btl	$9, EFLAGS(%rsp)		/* were interrupts off? */
@@ -1113,7 +1113,7 @@ ENTRY(xen_do_hypervisor_callback)		/* do
 	call	xen_evtchn_do_upcall
 	LEAVE_IRQ_STACK
 
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 	call	xen_maybe_preempt_hcall
 #endif
 	jmp	error_exit
--- a/arch/x86/entry/thunk_32.S
+++ b/arch/x86/entry/thunk_32.S
@@ -34,7 +34,7 @@
 	THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
 #endif
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	THUNK ___preempt_schedule, preempt_schedule
 	THUNK ___preempt_schedule_notrace, preempt_schedule_notrace
 	EXPORT_SYMBOL(___preempt_schedule)
--- a/arch/x86/entry/thunk_64.S
+++ b/arch/x86/entry/thunk_64.S
@@ -46,7 +46,7 @@
 	THUNK lockdep_sys_exit_thunk,lockdep_sys_exit
 #endif
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	THUNK ___preempt_schedule, preempt_schedule
 	THUNK ___preempt_schedule_notrace, preempt_schedule_notrace
 	EXPORT_SYMBOL(___preempt_schedule)
@@ -55,7 +55,7 @@
 
 #if defined(CONFIG_TRACE_IRQFLAGS) \
  || defined(CONFIG_DEBUG_LOCK_ALLOC) \
- || defined(CONFIG_PREEMPT)
+ || defined(CONFIG_PREEMPTION)
 .L_restore:
 	popq %r11
 	popq %r10
--- a/arch/x86/include/asm/preempt.h
+++ b/arch/x86/include/asm/preempt.h
@@ -102,7 +102,7 @@ static __always_inline bool should_resch
 	return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset);
 }
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
   extern asmlinkage void ___preempt_schedule(void);
 # define __preempt_schedule() \
 	asm volatile ("call ___preempt_schedule" : ASM_CALL_CONSTRAINT)
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -580,7 +580,7 @@ static void setup_singlestep(struct kpro
 	if (setup_detour_execution(p, regs, reenter))
 		return;
 
-#if !defined(CONFIG_PREEMPT)
+#if !defined(CONFIG_PREEMPTION)
 	if (p->ainsn.boostable && !p->post_handler) {
 		/* Boost up -- we can execute copied instructions directly */
 		if (!reenter)

[patch 7/8] x86/dumpstack: Indicate PREEMPT_RT in dumps

[Thomas Gleixner]

Stack dumps print whether the kernel has preemption enabled or not. Extend
it so a PREEMPT_RT enabled kernel can be identified.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/kernel/dumpstack.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -367,13 +367,18 @@ NOKPROBE_SYMBOL(oops_end);
 
 int __die(const char *str, struct pt_regs *regs, long err)
 {
+	const char *pr = "";
+
 	/* Save the regs of the first oops for the executive summary later. */
 	if (!die_counter)
 		exec_summary_regs = *regs;
 
+	if (IS_ENABLED(CONFIG_PREEMPTION))
+		pr = IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : " PREEMPT";
+
 	printk(KERN_DEFAULT
 	       "%s: %04lx [#%d]%s%s%s%s%s\n", str, err & 0xffff, ++die_counter,
-	       IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT"         : "",
+	       pr,
 	       IS_ENABLED(CONFIG_SMP)     ? " SMP"             : "",
 	       debug_pagealloc_enabled()  ? " DEBUG_PAGEALLOC" : "",
 	       IS_ENABLED(CONFIG_KASAN)   ? " KASAN"           : "",

[patch 8/8] x86/kvm: Use CONFIG_PREEMPTION

[Thomas Gleixner]

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the conditional for async pagefaults to use CONFIG_PREEMPTION.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kernel/kvm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -314,7 +314,7 @@ static void kvm_guest_cpu_init(void)
 	if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF) && kvmapf) {
 		u64 pa = slow_virt_to_phys(this_cpu_ptr(&apf_reason));
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 		pa |= KVM_ASYNC_PF_SEND_ALWAYS;
 #endif
 		pa |= KVM_ASYNC_PF_ENABLED;

Re: [patch 0/8] core, x86: Preparatory steps for RT

[Steven Rostedt]

On Fri, 26 Jul 2019 23:19:36 +0200
Thomas Gleixner <tglx@linutronix.de> wrote:

> CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
> CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
> functionality which today depends on CONFIG_PREEMPT.
> 
> The following series adjusts the core and x86 code to use
> CONFIG_PREEMPTION where appropriate and extends the x86 dumpstack
> implementation to display PREEMPT_RT instead of PREEMPT on a RT
> enabled kernel.
>

Hmm, I'm looking at v5.3-rc1 and I don't see a CONFIG_PREEMPTION
defined. And the first patch doesn't define it. Did I miss a patch
series that adds it?

-- Steve

Re: [patch 0/8] core, x86: Preparatory steps for RT

[Thomas Gleixner]

On Fri, 26 Jul 2019, Steven Rostedt wrote:

> On Fri, 26 Jul 2019 23:19:36 +0200
> Thomas Gleixner <tglx@linutronix.de> wrote:
> 
> > CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
> > CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
> > functionality which today depends on CONFIG_PREEMPT.
> > 
> > The following series adjusts the core and x86 code to use
> > CONFIG_PREEMPTION where appropriate and extends the x86 dumpstack
> > implementation to display PREEMPT_RT instead of PREEMPT on a RT
> > enabled kernel.
> >
> 
> Hmm, I'm looking at v5.3-rc1 and I don't see a CONFIG_PREEMPTION
> defined. And the first patch doesn't define it. Did I miss a patch
> series that adds it?

It came right after rc1. The initial commit renamed PREEMPT to PREEMPT_LL
and seletced PREEMPT, but that broke defconfigs and make olddefconfig :(

And in fact it was a good thing that I had to stare at all CONFIG_PREEMPT
dependencies. Found some interesting things already :)

Thanks,

	tglx

Re: [patch 0/8] core, x86: Preparatory steps for RT

[Peter Zijlstra]

On Fri, Jul 26, 2019 at 11:19:36PM +0200, Thomas Gleixner wrote:
> CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
> CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
> functionality which today depends on CONFIG_PREEMPT.
> 
> The following series adjusts the core and x86 code to use
> CONFIG_PREEMPTION where appropriate and extends the x86 dumpstack
> implementation to display PREEMPT_RT instead of PREEMPT on a RT
> enabled kernel.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

[tip:sched/rt] sched/preempt: Use CONFIG_PREEMPTION where appropriate

[tip-bot for Thomas Gleixner]

Commit-ID:  c1a280b68d4e6b6db4a65aa7865c22d8789ddf09
Gitweb:     https://git.kernel.org/tip/c1a280b68d4e6b6db4a65aa7865c22d8789ddf09
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 26 Jul 2019 23:19:37 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 31 Jul 2019 19:03:34 +0200

sched/preempt: Use CONFIG_PREEMPTION where appropriate

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the preemption code, scheduler and init task over to use
CONFIG_PREEMPTION.

That's the first step towards RT in that area. The more complex changes are
coming separately.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.117528401@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 include/asm-generic/preempt.h |  4 ++--
 include/linux/preempt.h       |  6 +++---
 include/linux/sched.h         |  6 +++---
 init/init_task.c              |  2 +-
 init/main.c                   |  2 +-
 kernel/sched/core.c           | 14 +++++++-------
 kernel/sched/fair.c           |  2 +-
 kernel/sched/sched.h          |  4 ++--
 8 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/include/asm-generic/preempt.h b/include/asm-generic/preempt.h
index c3046c920063..d683f5e6d791 100644
--- a/include/asm-generic/preempt.h
+++ b/include/asm-generic/preempt.h
@@ -78,11 +78,11 @@ static __always_inline bool should_resched(int preempt_offset)
 			tif_need_resched());
 }
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 extern asmlinkage void preempt_schedule(void);
 #define __preempt_schedule() preempt_schedule()
 extern asmlinkage void preempt_schedule_notrace(void);
 #define __preempt_schedule_notrace() preempt_schedule_notrace()
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 
 #endif /* __ASM_PREEMPT_H */
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index dd92b1a93919..bbb68dba37cc 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -182,7 +182,7 @@ do { \
 
 #define preemptible()	(preempt_count() == 0 && !irqs_disabled())
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 #define preempt_enable() \
 do { \
 	barrier(); \
@@ -203,7 +203,7 @@ do { \
 		__preempt_schedule(); \
 } while (0)
 
-#else /* !CONFIG_PREEMPT */
+#else /* !CONFIG_PREEMPTION */
 #define preempt_enable() \
 do { \
 	barrier(); \
@@ -217,7 +217,7 @@ do { \
 } while (0)
 
 #define preempt_check_resched() do { } while (0)
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 
 #define preempt_disable_notrace() \
 do { \
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 9f51932bd543..6947516a2d3e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1767,7 +1767,7 @@ static inline int test_tsk_need_resched(struct task_struct *tsk)
  * value indicates whether a reschedule was done in fact.
  * cond_resched_lock() will drop the spinlock before scheduling,
  */
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 extern int _cond_resched(void);
 #else
 static inline int _cond_resched(void) { return 0; }
@@ -1796,12 +1796,12 @@ static inline void cond_resched_rcu(void)
 
 /*
  * Does a critical section need to be broken due to another
- * task waiting?: (technically does not depend on CONFIG_PREEMPT,
+ * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
  * but a general need for low latency)
  */
 static inline int spin_needbreak(spinlock_t *lock)
 {
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	return spin_is_contended(lock);
 #else
 	return 0;
diff --git a/init/init_task.c b/init/init_task.c
index 7ab773b9b3cd..bfe06c53b14e 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -174,7 +174,7 @@ struct task_struct init_task
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	.ret_stack	= NULL,
 #endif
-#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
+#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
 	.trace_recursion = 0,
 #endif
 #ifdef CONFIG_LIVEPATCH
diff --git a/init/main.c b/init/main.c
index 96f8d5af52d6..653693da8da6 100644
--- a/init/main.c
+++ b/init/main.c
@@ -433,7 +433,7 @@ noinline void __ref rest_init(void)
 
 	/*
 	 * Enable might_sleep() and smp_processor_id() checks.
-	 * They cannot be enabled earlier because with CONFIG_PREEMPT=y
+	 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y
 	 * kernel_thread() would trigger might_sleep() splats. With
 	 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
 	 * already, but it's stuck on the kthreadd_done completion.
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 2b037f195473..604a5e137efe 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3581,7 +3581,7 @@ static inline void sched_tick_start(int cpu) { }
 static inline void sched_tick_stop(int cpu) { }
 #endif
 
-#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
+#if defined(CONFIG_PREEMPTION) && (defined(CONFIG_DEBUG_PREEMPT) || \
 				defined(CONFIG_TRACE_PREEMPT_TOGGLE))
 /*
  * If the value passed in is equal to the current preempt count
@@ -3782,7 +3782,7 @@ again:
  *      task, then the wakeup sets TIF_NEED_RESCHED and schedule() gets
  *      called on the nearest possible occasion:
  *
- *       - If the kernel is preemptible (CONFIG_PREEMPT=y):
+ *       - If the kernel is preemptible (CONFIG_PREEMPTION=y):
  *
  *         - in syscall or exception context, at the next outmost
  *           preempt_enable(). (this might be as soon as the wake_up()'s
@@ -3791,7 +3791,7 @@ again:
  *         - in IRQ context, return from interrupt-handler to
  *           preemptible context
  *
- *       - If the kernel is not preemptible (CONFIG_PREEMPT is not set)
+ *       - If the kernel is not preemptible (CONFIG_PREEMPTION is not set)
  *         then at the next:
  *
  *          - cond_resched() call
@@ -4033,7 +4033,7 @@ static void __sched notrace preempt_schedule_common(void)
 	} while (need_resched());
 }
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 /*
  * this is the entry point to schedule() from in-kernel preemption
  * off of preempt_enable. Kernel preemptions off return from interrupt
@@ -4105,7 +4105,7 @@ asmlinkage __visible void __sched notrace preempt_schedule_notrace(void)
 }
 EXPORT_SYMBOL_GPL(preempt_schedule_notrace);
 
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 
 /*
  * this is the entry point to schedule() from kernel preemption
@@ -5416,7 +5416,7 @@ SYSCALL_DEFINE0(sched_yield)
 	return 0;
 }
 
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 int __sched _cond_resched(void)
 {
 	if (should_resched(0)) {
@@ -5433,7 +5433,7 @@ EXPORT_SYMBOL(_cond_resched);
  * __cond_resched_lock() - if a reschedule is pending, drop the given lock,
  * call schedule, and on return reacquire the lock.
  *
- * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
+ * This works OK both with and without CONFIG_PREEMPTION. We do strange low-level
  * operations here to prevent schedule() from being called twice (once via
  * spin_unlock(), once by hand).
  */
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index bc9cfeaac8bd..aff9d76d8d65 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7430,7 +7430,7 @@ static int detach_tasks(struct lb_env *env)
 		detached++;
 		env->imbalance -= load;
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 		/*
 		 * NEWIDLE balancing is a source of latency, so preemptible
 		 * kernels will stop after the first task is detached to minimize
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 802b1f3405f2..f2ce6ba1c5d5 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1943,7 +1943,7 @@ unsigned long arch_scale_freq_capacity(int cpu)
 #endif
 
 #ifdef CONFIG_SMP
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 
 static inline void double_rq_lock(struct rq *rq1, struct rq *rq2);
 
@@ -1995,7 +1995,7 @@ static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
 	return ret;
 }
 
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 
 /*
  * double_lock_balance - lock the busiest runqueue, this_rq is locked already.

[tip:sched/rt] rcu: Use CONFIG_PREEMPTION

[tip-bot for Thomas Gleixner]

Commit-ID:  01b1d88b09824bea1a75b0bac04dcf50d9893875
Gitweb:     https://git.kernel.org/tip/01b1d88b09824bea1a75b0bac04dcf50d9893875
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 26 Jul 2019 23:19:38 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 31 Jul 2019 19:03:35 +0200

rcu: Use CONFIG_PREEMPTION

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the conditionals in RCU to use CONFIG_PREEMPTION.

That's the first step towards RCU on RT. The further tweaks are work in
progress. This neither touches the selftest bits which need a closer look
by Paul.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.210156346@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/Kconfig             | 2 +-
 include/linux/rcupdate.h | 2 +-
 include/linux/rcutree.h  | 2 +-
 include/linux/torture.h  | 2 +-
 kernel/rcu/Kconfig       | 8 ++++----
 kernel/rcu/tree.c        | 6 +++---
 kernel/rcu/tree_stall.h  | 6 +++---
 kernel/trace/Kconfig     | 2 +-
 8 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index a7b57dd42c26..c7efbc018f4f 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -103,7 +103,7 @@ config STATIC_KEYS_SELFTEST
 config OPTPROBES
 	def_bool y
 	depends on KPROBES && HAVE_OPTPROBES
-	select TASKS_RCU if PREEMPT
+	select TASKS_RCU if PREEMPTION
 
 config KPROBES_ON_FTRACE
 	def_bool y
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 8f7167478c1d..c4f76a310443 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -578,7 +578,7 @@ do {									      \
  *
  * In non-preemptible RCU implementations (TREE_RCU and TINY_RCU),
  * it is illegal to block while in an RCU read-side critical section.
- * In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPT
+ * In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPTION
  * kernel builds, RCU read-side critical sections may be preempted,
  * but explicit blocking is illegal.  Finally, in preemptible RCU
  * implementations in real-time (with -rt patchset) kernel builds, RCU
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 735601ac27d3..18b1ed9864b0 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -53,7 +53,7 @@ void rcu_scheduler_starting(void);
 extern int rcu_scheduler_active __read_mostly;
 void rcu_end_inkernel_boot(void);
 bool rcu_is_watching(void);
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 void rcu_all_qs(void);
 #endif
 
diff --git a/include/linux/torture.h b/include/linux/torture.h
index a620118385bb..6241f59e2d6f 100644
--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -86,7 +86,7 @@ void _torture_stop_kthread(char *m, struct task_struct **tp);
 #define torture_stop_kthread(n, tp) \
 	_torture_stop_kthread("Stopping " #n " task", &(tp))
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 #define torture_preempt_schedule() preempt_schedule()
 #else
 #define torture_preempt_schedule()
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig
index 480edf328b51..7644eda17d62 100644
--- a/kernel/rcu/Kconfig
+++ b/kernel/rcu/Kconfig
@@ -7,7 +7,7 @@ menu "RCU Subsystem"
 
 config TREE_RCU
 	bool
-	default y if !PREEMPT && SMP
+	default y if !PREEMPTION && SMP
 	help
 	  This option selects the RCU implementation that is
 	  designed for very large SMP system with hundreds or
@@ -16,7 +16,7 @@ config TREE_RCU
 
 config PREEMPT_RCU
 	bool
-	default y if PREEMPT
+	default y if PREEMPTION
 	help
 	  This option selects the RCU implementation that is
 	  designed for very large SMP systems with hundreds or
@@ -28,7 +28,7 @@ config PREEMPT_RCU
 
 config TINY_RCU
 	bool
-	default y if !PREEMPT && !SMP
+	default y if !PREEMPTION && !SMP
 	help
 	  This option selects the RCU implementation that is
 	  designed for UP systems from which real-time response
@@ -70,7 +70,7 @@ config TREE_SRCU
 	  This option selects the full-fledged version of SRCU.
 
 config TASKS_RCU
-	def_bool PREEMPT
+	def_bool PREEMPTION
 	select SRCU
 	help
 	  This option enables a task-based RCU implementation that uses
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index a14e5fbbea46..5962636502bc 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1881,7 +1881,7 @@ rcu_report_unblock_qs_rnp(struct rcu_node *rnp, unsigned long flags)
 	struct rcu_node *rnp_p;
 
 	raw_lockdep_assert_held_rcu_node(rnp);
-	if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPT)) ||
+	if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPTION)) ||
 	    WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp)) ||
 	    rnp->qsmask != 0) {
 		raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
@@ -2205,7 +2205,7 @@ static void force_qs_rnp(int (*f)(struct rcu_data *rdp))
 		mask = 0;
 		raw_spin_lock_irqsave_rcu_node(rnp, flags);
 		if (rnp->qsmask == 0) {
-			if (!IS_ENABLED(CONFIG_PREEMPT) ||
+			if (!IS_ENABLED(CONFIG_PREEMPTION) ||
 			    rcu_preempt_blocked_readers_cgp(rnp)) {
 				/*
 				 * No point in scanning bits because they
@@ -2622,7 +2622,7 @@ static int rcu_blocking_is_gp(void)
 {
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PREEMPT))
+	if (IS_ENABLED(CONFIG_PREEMPTION))
 		return rcu_scheduler_active == RCU_SCHEDULER_INACTIVE;
 	might_sleep();  /* Check for RCU read-side critical section. */
 	preempt_disable();
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index 065183391f75..9b92bf18b737 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -163,7 +163,7 @@ static void rcu_iw_handler(struct irq_work *iwp)
 //
 // Printing RCU CPU stall warnings
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 
 /*
  * Dump detailed information for all tasks blocking the current RCU
@@ -215,7 +215,7 @@ static int rcu_print_task_stall(struct rcu_node *rnp)
 	return ndetected;
 }
 
-#else /* #ifdef CONFIG_PREEMPT */
+#else /* #ifdef CONFIG_PREEMPTION */
 
 /*
  * Because preemptible RCU does not exist, we never have to check for
@@ -233,7 +233,7 @@ static int rcu_print_task_stall(struct rcu_node *rnp)
 {
 	return 0;
 }
-#endif /* #else #ifdef CONFIG_PREEMPT */
+#endif /* #else #ifdef CONFIG_PREEMPTION */
 
 /*
  * Dump stacks of all tasks running on stalled CPUs.  First try using
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 98da8998c25c..d2c1fe0b451d 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -146,7 +146,7 @@ config FUNCTION_TRACER
 	select GENERIC_TRACER
 	select CONTEXT_SWITCH_TRACER
 	select GLOB
-	select TASKS_RCU if PREEMPT
+	select TASKS_RCU if PREEMPTION
 	help
 	  Enable the kernel to trace every kernel function. This is done
 	  by using a compiler feature to insert a small, 5-byte No-Operation

[tip:sched/rt] locking/spinlocks: Use CONFIG_PREEMPTION

[tip-bot for Thomas Gleixner]

Commit-ID:  27972765bd0410fc2ef5e86a41de17c71440a2dd
Gitweb:     https://git.kernel.org/tip/27972765bd0410fc2ef5e86a41de17c71440a2dd
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 26 Jul 2019 23:19:39 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 31 Jul 2019 19:03:35 +0200

locking/spinlocks: Use CONFIG_PREEMPTION

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Adjust the comments in the locking code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.302995288@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 include/linux/spinlock.h         | 2 +-
 include/linux/spinlock_api_smp.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index ed7c4d6b8235..031ce8617df8 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -214,7 +214,7 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
 
 /*
  * Define the various spin_lock methods.  Note we define these
- * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The
+ * regardless of whether CONFIG_SMP or CONFIG_PREEMPTION are set. The
  * various methods are defined as nops in the case they are not
  * required.
  */
diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_smp.h
index 42dfab89e740..b762eaba4cdf 100644
--- a/include/linux/spinlock_api_smp.h
+++ b/include/linux/spinlock_api_smp.h
@@ -96,7 +96,7 @@ static inline int __raw_spin_trylock(raw_spinlock_t *lock)
 
 /*
  * If lockdep is enabled then we use the non-preemption spin-ops
- * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
+ * even on CONFIG_PREEMPTION, because lockdep assumes that interrupts are
  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
  */
 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)

[tip:sched/rt] tracing: Use CONFIG_PREEMPTION

[tip-bot for Thomas Gleixner]

Commit-ID:  30c937043b2db09ae3408f5534824f9ececdb581
Gitweb:     https://git.kernel.org/tip/30c937043b2db09ae3408f5534824f9ececdb581
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 26 Jul 2019 23:19:40 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 31 Jul 2019 19:03:35 +0200

tracing: Use CONFIG_PREEMPTION

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the conditionals in the tracer over to CONFIG_PREEMPTION.

This is the first step to make the tracer work on RT. The other small
tweaks are submitted separately.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.409766323@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/trace/Kconfig                 | 4 ++--
 kernel/trace/ftrace.c                | 2 +-
 kernel/trace/ring_buffer_benchmark.c | 2 +-
 kernel/trace/trace_events.c          | 4 ++--
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index d2c1fe0b451d..6a64d7772870 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -179,7 +179,7 @@ config TRACE_PREEMPT_TOGGLE
 config PREEMPTIRQ_EVENTS
 	bool "Enable trace events for preempt and irq disable/enable"
 	select TRACE_IRQFLAGS
-	select TRACE_PREEMPT_TOGGLE if PREEMPT
+	select TRACE_PREEMPT_TOGGLE if PREEMPTION
 	select GENERIC_TRACER
 	default n
 	help
@@ -214,7 +214,7 @@ config PREEMPT_TRACER
 	bool "Preemption-off Latency Tracer"
 	default n
 	depends on !ARCH_USES_GETTIMEOFFSET
-	depends on PREEMPT
+	depends on PREEMPTION
 	select GENERIC_TRACER
 	select TRACER_MAX_TRACE
 	select RING_BUFFER_ALLOW_SWAP
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index eca34503f178..a800e867c1a3 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2814,7 +2814,7 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
 		 * synchornize_rcu_tasks() will wait for those tasks to
 		 * execute and either schedule voluntarily or enter user space.
 		 */
-		if (IS_ENABLED(CONFIG_PREEMPT))
+		if (IS_ENABLED(CONFIG_PREEMPTION))
 			synchronize_rcu_tasks();
 
  free_ops:
diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
index 0564f6db0561..09b0b49f346e 100644
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -267,7 +267,7 @@ static void ring_buffer_producer(void)
 		if (consumer && !(cnt % wakeup_interval))
 			wake_up_process(consumer);
 
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 		/*
 		 * If we are a non preempt kernel, the 10 second run will
 		 * stop everything while it runs. Instead, we will call
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index c7506bc81b75..5a189fb8ec23 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -255,12 +255,12 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
 	local_save_flags(fbuffer->flags);
 	fbuffer->pc = preempt_count();
 	/*
-	 * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables
+	 * If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables
 	 * preemption (adding one to the preempt_count). Since we are
 	 * interested in the preempt_count at the time the tracepoint was
 	 * hit, we need to subtract one to offset the increment.
 	 */
-	if (IS_ENABLED(CONFIG_PREEMPT))
+	if (IS_ENABLED(CONFIG_PREEMPTION))
 		fbuffer->pc--;
 	fbuffer->trace_file = trace_file;
 

[tip:sched/rt] kprobes: Use CONFIG_PREEMPTION

[tip-bot for Thomas Gleixner]

Commit-ID:  92616606368ee01f1163fcfc986116c810cd48ba
Gitweb:     https://git.kernel.org/tip/92616606368ee01f1163fcfc986116c810cd48ba
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 26 Jul 2019 23:19:41 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 31 Jul 2019 19:03:35 +0200

kprobes: Use CONFIG_PREEMPTION

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch kprobes conditional over to CONFIG_PREEMPTION.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.516286187@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/kprobes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 9873fc627d61..8bc5f1ffd68e 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1906,7 +1906,7 @@ int register_kretprobe(struct kretprobe *rp)
 
 	/* Pre-allocate memory for max kretprobe instances */
 	if (rp->maxactive <= 0) {
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 		rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus());
 #else
 		rp->maxactive = num_possible_cpus();

[tip:sched/rt] x86: Use CONFIG_PREEMPTION

[tip-bot for Thomas Gleixner]

Commit-ID:  48593975aeee548f25e256c515fd1d1e3fb2cc20
Gitweb:     https://git.kernel.org/tip/48593975aeee548f25e256c515fd1d1e3fb2cc20
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 26 Jul 2019 23:19:42 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 31 Jul 2019 19:03:35 +0200

x86: Use CONFIG_PREEMPTION

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the entry code, preempt and kprobes conditionals over to
CONFIG_PREEMPTION.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.608488448@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/entry/entry_32.S      | 6 +++---
 arch/x86/entry/entry_64.S      | 4 ++--
 arch/x86/entry/thunk_32.S      | 2 +-
 arch/x86/entry/thunk_64.S      | 4 ++--
 arch/x86/include/asm/preempt.h | 2 +-
 arch/x86/kernel/kprobes/core.c | 2 +-
 6 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 4f86928246e7..f83ca5aa8b77 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -63,7 +63,7 @@
  * enough to patch inline, increasing performance.
  */
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 # define preempt_stop(clobbers)	DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF
 #else
 # define preempt_stop(clobbers)
@@ -1084,7 +1084,7 @@ restore_all:
 	INTERRUPT_RETURN
 
 restore_all_kernel:
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	DISABLE_INTERRUPTS(CLBR_ANY)
 	cmpl	$0, PER_CPU_VAR(__preempt_count)
 	jnz	.Lno_preempt
@@ -1364,7 +1364,7 @@ ENTRY(xen_hypervisor_callback)
 ENTRY(xen_do_upcall)
 1:	mov	%esp, %eax
 	call	xen_evtchn_do_upcall
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 	call	xen_maybe_preempt_hcall
 #endif
 	jmp	ret_from_intr
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 3f5a978a02a7..9701464341e4 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -662,7 +662,7 @@ GLOBAL(swapgs_restore_regs_and_return_to_usermode)
 
 /* Returning to kernel space */
 retint_kernel:
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	/* Interrupts are off */
 	/* Check if we need preemption */
 	btl	$9, EFLAGS(%rsp)		/* were interrupts off? */
@@ -1113,7 +1113,7 @@ ENTRY(xen_do_hypervisor_callback)		/* do_hypervisor_callback(struct *pt_regs) */
 	call	xen_evtchn_do_upcall
 	LEAVE_IRQ_STACK
 
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 	call	xen_maybe_preempt_hcall
 #endif
 	jmp	error_exit
diff --git a/arch/x86/entry/thunk_32.S b/arch/x86/entry/thunk_32.S
index cb3464525b37..2713490611a3 100644
--- a/arch/x86/entry/thunk_32.S
+++ b/arch/x86/entry/thunk_32.S
@@ -34,7 +34,7 @@
 	THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
 #endif
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	THUNK ___preempt_schedule, preempt_schedule
 	THUNK ___preempt_schedule_notrace, preempt_schedule_notrace
 	EXPORT_SYMBOL(___preempt_schedule)
diff --git a/arch/x86/entry/thunk_64.S b/arch/x86/entry/thunk_64.S
index cc20465b2867..ea5c4167086c 100644
--- a/arch/x86/entry/thunk_64.S
+++ b/arch/x86/entry/thunk_64.S
@@ -46,7 +46,7 @@
 	THUNK lockdep_sys_exit_thunk,lockdep_sys_exit
 #endif
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	THUNK ___preempt_schedule, preempt_schedule
 	THUNK ___preempt_schedule_notrace, preempt_schedule_notrace
 	EXPORT_SYMBOL(___preempt_schedule)
@@ -55,7 +55,7 @@
 
 #if defined(CONFIG_TRACE_IRQFLAGS) \
  || defined(CONFIG_DEBUG_LOCK_ALLOC) \
- || defined(CONFIG_PREEMPT)
+ || defined(CONFIG_PREEMPTION)
 .L_restore:
 	popq %r11
 	popq %r10
diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h
index 99a7fa9ab0a3..3d4cb83a8828 100644
--- a/arch/x86/include/asm/preempt.h
+++ b/arch/x86/include/asm/preempt.h
@@ -102,7 +102,7 @@ static __always_inline bool should_resched(int preempt_offset)
 	return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset);
 }
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
   extern asmlinkage void ___preempt_schedule(void);
 # define __preempt_schedule() \
 	asm volatile ("call ___preempt_schedule" : ASM_CALL_CONSTRAINT)
diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 0e0b08008b5a..43fc13c831af 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -580,7 +580,7 @@ static void setup_singlestep(struct kprobe *p, struct pt_regs *regs,
 	if (setup_detour_execution(p, regs, reenter))
 		return;
 
-#if !defined(CONFIG_PREEMPT)
+#if !defined(CONFIG_PREEMPTION)
 	if (p->ainsn.boostable && !p->post_handler) {
 		/* Boost up -- we can execute copied instructions directly */
 		if (!reenter)

[tip:sched/rt] x86/dumpstack: Indicate PREEMPT_RT in dumps

[tip-bot for Thomas Gleixner]

Commit-ID:  cb376c26971ff54f25980ec1f0ae2f06d6a69df0
Gitweb:     https://git.kernel.org/tip/cb376c26971ff54f25980ec1f0ae2f06d6a69df0
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 26 Jul 2019 23:19:43 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 31 Jul 2019 19:03:36 +0200

x86/dumpstack: Indicate PREEMPT_RT in dumps

Stack dumps print whether the kernel has preemption enabled or not. Extend
it so a PREEMPT_RT enabled kernel can be identified.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.699136351@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/dumpstack.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 2b5886401e5f..e07424e19274 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -367,13 +367,18 @@ NOKPROBE_SYMBOL(oops_end);
 
 int __die(const char *str, struct pt_regs *regs, long err)
 {
+	const char *pr = "";
+
 	/* Save the regs of the first oops for the executive summary later. */
 	if (!die_counter)
 		exec_summary_regs = *regs;
 
+	if (IS_ENABLED(CONFIG_PREEMPTION))
+		pr = IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : " PREEMPT";
+
 	printk(KERN_DEFAULT
 	       "%s: %04lx [#%d]%s%s%s%s%s\n", str, err & 0xffff, ++die_counter,
-	       IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT"         : "",
+	       pr,
 	       IS_ENABLED(CONFIG_SMP)     ? " SMP"             : "",
 	       debug_pagealloc_enabled()  ? " DEBUG_PAGEALLOC" : "",
 	       IS_ENABLED(CONFIG_KASAN)   ? " KASAN"           : "",

[tip:sched/rt] x86/kvm: Use CONFIG_PREEMPTION

[tip-bot for Thomas Gleixner]

Commit-ID:  09c7e8b21d67c3c78ab9701dbc0fb1e9f14a0ba5
Gitweb:     https://git.kernel.org/tip/09c7e8b21d67c3c78ab9701dbc0fb1e9f14a0ba5
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 26 Jul 2019 23:19:44 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 31 Jul 2019 19:03:36 +0200

x86/kvm: Use CONFIG_PREEMPTION

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the conditional for async pagefaults to use CONFIG_PREEMPTION.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.789755413@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/kvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index b7f34fe2171e..3d07f84c4846 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -314,7 +314,7 @@ static void kvm_guest_cpu_init(void)
 	if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF) && kvmapf) {
 		u64 pa = slow_virt_to_phys(this_cpu_ptr(&apf_reason));
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 		pa |= KVM_ASYNC_PF_SEND_ALWAYS;
 #endif
 		pa |= KVM_ASYNC_PF_ENABLED;