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Commit 0bbfcaff authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull irq/core changes for v3.4 from Ingo Molnar

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Remove paranoid warnons and bogus fixups
  genirq: Flush the irq thread on synchronization
  genirq: Get rid of unnecessary IRQTF_DIED flag
  genirq: No need to check IRQTF_DIED before stopping a thread handler
  genirq: Get rid of unnecessary irqaction field in task_struct
  genirq: Fix incorrect check for forced IRQ thread handler
  softirq: Reduce invoke_softirq() code duplication
  genirq: Fix long-term regression in genirq irq_set_irq_type() handling
  x86-32/irq: Don't switch to irq stack for a user-mode irq
parents 5928a2b6 e04268b0

arch/x86/kernel/irq_32.c

+3 −8
Original line number Diff line number Diff line
@@ -100,13 +100,8 @@ execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq) 
	irqctx->tinfo.task = curctx->tinfo.task;

	irqctx->tinfo.previous_esp = current_stack_pointer;



	/*

	 * Copy the softirq bits in preempt_count so that the

	 * softirq checks work in the hardirq context.

	 */

	irqctx->tinfo.preempt_count =

		(irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) |

		(curctx->tinfo.preempt_count & SOFTIRQ_MASK);

	/* Copy the preempt_count so that the [soft]irq checks work. */

	irqctx->tinfo.preempt_count = curctx->tinfo.preempt_count;



	if (unlikely(overflow))

		call_on_stack(print_stack_overflow, isp);
@@ -196,7 +191,7 @@ bool handle_irq(unsigned irq, struct pt_regs *regs) 
	if (unlikely(!desc))

		return false;



	if (!execute_on_irq_stack(overflow, desc, irq)) {

	if (user_mode_vm(regs) || !execute_on_irq_stack(overflow, desc, irq)) {

		if (unlikely(overflow))

			print_stack_overflow();

		desc->handle_irq(irq, desc);

include/linux/sched.h

+5 −5
Original line number Diff line number Diff line
@@ -1319,6 +1319,11 @@ struct task_struct { 
	unsigned sched_reset_on_fork:1;

	unsigned sched_contributes_to_load:1;



#ifdef CONFIG_GENERIC_HARDIRQS

	/* IRQ handler threads */

	unsigned irq_thread:1;

#endif



	pid_t pid;

	pid_t tgid;
@@ -1427,11 +1432,6 @@ struct task_struct { 
 * mempolicy */

	spinlock_t alloc_lock;



#ifdef CONFIG_GENERIC_HARDIRQS

	/* IRQ handler threads */

	struct irqaction *irqaction;

#endif



	/* Protection of the PI data structures: */

	raw_spinlock_t pi_lock;

kernel/exit.c

+2 −2
Original line number Diff line number Diff line
@@ -935,8 +935,6 @@ void do_exit(long code) 
		schedule();

	}



	exit_irq_thread();



	exit_signals(tsk);  /* sets PF_EXITING */

	/*

	 * tsk->flags are checked in the futex code to protect against
@@ -945,6 +943,8 @@ void do_exit(long code) 
	smp_mb();

	raw_spin_unlock_wait(&tsk->pi_lock);



	exit_irq_thread();



	if (unlikely(in_atomic()))

		printk(KERN_INFO "note: %s[%d] exited with preempt_count %d\n",

				current->comm, task_pid_nr(current),

kernel/irq/chip.c

+1 −2
Original line number Diff line number Diff line
@@ -61,7 +61,6 @@ int irq_set_irq_type(unsigned int irq, unsigned int type) 
		return -EINVAL;



	type &= IRQ_TYPE_SENSE_MASK;

	if (type != IRQ_TYPE_NONE)

	ret = __irq_set_trigger(desc, irq, type);

	irq_put_desc_busunlock(desc, flags);

	return ret;

kernel/irq/handle.c

+13 −1
Original line number Diff line number Diff line
@@ -60,7 +60,7 @@ static void irq_wake_thread(struct irq_desc *desc, struct irqaction *action) 
	 * device interrupt, so no irq storm is lurking. If the

	 * RUNTHREAD bit is already set, nothing to do.

	 */

	if (test_bit(IRQTF_DIED, &action->thread_flags) ||

	if ((action->thread->flags & PF_EXITING) ||

	    test_and_set_bit(IRQTF_RUNTHREAD, &action->thread_flags))

		return;
@@ -110,6 +110,18 @@ static void irq_wake_thread(struct irq_desc *desc, struct irqaction *action) 
	 * threads_oneshot untouched and runs the thread another time.

	 */

	desc->threads_oneshot |= action->thread_mask;



	/*

	 * We increment the threads_active counter in case we wake up

	 * the irq thread. The irq thread decrements the counter when

	 * it returns from the handler or in the exit path and wakes

	 * up waiters which are stuck in synchronize_irq() when the

	 * active count becomes zero. synchronize_irq() is serialized

	 * against this code (hard irq handler) via IRQS_INPROGRESS

	 * like the finalize_oneshot() code. See comment above.

	 */

	atomic_inc(&desc->threads_active);



	wake_up_process(action->thread);

}