diff options
| author | Alexander Gordeev <agordeev@redhat.com> | 2012-03-09 14:59:26 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2012-03-09 17:19:08 +0100 |
| commit | 4bcdf1d0b652bc33d52f2322b77463e4dc58abf8 (patch) | |
| tree | 2a8ecf0f6ef1d0c85a4553cb1d1c7dc74706488a /kernel/irq/manage.c | |
| parent | genirq: Fix incorrect check for forced IRQ thread handler (diff) | |
| download | linux-4bcdf1d0b652bc33d52f2322b77463e4dc58abf8.tar.xz linux-4bcdf1d0b652bc33d52f2322b77463e4dc58abf8.zip | |
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/irq/manage.c')
| -rw-r--r-- | kernel/irq/manage.c | 19 |
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, ¶m); - 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) |