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authorAlexander Gordeev <agordeev@redhat.com>2012-03-09 14:59:26 +0100
committerThomas Gleixner <tglx@linutronix.de>2012-03-09 17:19:08 +0100
commit4bcdf1d0b652bc33d52f2322b77463e4dc58abf8 (patch)
tree2a8ecf0f6ef1d0c85a4553cb1d1c7dc74706488a /kernel
parent540b60e24f3f4781d80e47122f0c4486a03375b8 (diff)
downloadlinux-4bcdf1d0b652bc33d52f2322b77463e4dc58abf8.tar.bz2
genirq: Get rid of unnecessary irqaction field in task_struct
When a new thread handler is created, an irqaction is passed to it as data. Not only that irqaction is stored in task_struct by the handler for later use, but also a structure associated with the kernel thread keeps this value as long as the thread exists. This fix kicks irqaction out off task_struct. Yes, I introduce new bit field. But it allows not only to eliminate the duplicate, but also shortens size of task_struct. Reported-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Alexander Gordeev <agordeev@redhat.com> Link: http://lkml.kernel.org/r/20120309135925.GB2114@dhcp-26-207.brq.redhat.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/manage.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c0730ad8a117..0fa3ce998ecb 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -780,7 +780,7 @@ static int irq_thread(void *data)
handler_fn = irq_thread_fn;
sched_setscheduler(current, SCHED_FIFO, &param);
- current->irqaction = action;
+ current->irq_thread = 1;
while (!irq_wait_for_interrupt(action)) {
@@ -818,10 +818,10 @@ static int irq_thread(void *data)
irq_finalize_oneshot(desc, action, true);
/*
- * Clear irqaction. Otherwise exit_irq_thread() would make
+ * Clear irq_thread. Otherwise exit_irq_thread() would make
* fuzz about an active irq thread going into nirvana.
*/
- current->irqaction = NULL;
+ current->irq_thread = 0;
return 0;
}
@@ -832,27 +832,30 @@ void exit_irq_thread(void)
{
struct task_struct *tsk = current;
struct irq_desc *desc;
+ struct irqaction *action;
- if (!tsk->irqaction)
+ if (!tsk->irq_thread)
return;
+ action = kthread_data(tsk);
+
printk(KERN_ERR
"exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n",
- tsk->comm ? tsk->comm : "", tsk->pid, tsk->irqaction->irq);
+ tsk->comm ? tsk->comm : "", tsk->pid, action->irq);
- desc = irq_to_desc(tsk->irqaction->irq);
+ desc = irq_to_desc(action->irq);
/*
* Prevent a stale desc->threads_oneshot. Must be called
* before setting the IRQTF_DIED flag.
*/
- irq_finalize_oneshot(desc, tsk->irqaction, true);
+ irq_finalize_oneshot(desc, action, true);
/*
* Set the THREAD DIED flag to prevent further wakeups of the
* soon to be gone threaded handler.
*/
- set_bit(IRQTF_DIED, &tsk->irqaction->flags);
+ set_bit(IRQTF_DIED, &action->flags);
}
static void irq_setup_forced_threading(struct irqaction *new)