diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-08-21 18:38:50 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-02-13 22:21:02 (GMT) |
| commit | 9a27bb504194a8f6351513b3153c290c2ec90b09 (patch) | |
| tree | 0d90afd9b4c644f495f28c138ab61733fc8043e2 /kernel | |
| parent | bdf96ee423279aa590ba3afd784013771f85de70 (diff) | |
| download | linux-fsl-qoriq-9a27bb504194a8f6351513b3153c290c2ec90b09.tar.xz | |
random: Make it work on rt
Delegate the random insertion to the forced threaded interrupt
handler. Store the return IP of the hard interrupt handler in the irq
descriptor and feed it into the random generator as a source of
entropy.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable-rt@vger.kernel.org
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/handle.c | 8 | ||||
| -rw-r--r-- | kernel/irq/manage.c | 6 |
2 files changed, 13 insertions, 1 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 131ca17..7f50c55 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -132,6 +132,8 @@ static void irq_wake_thread(struct irq_desc *desc, struct irqaction *action) irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action) { + struct pt_regs *regs = get_irq_regs(); + u64 ip = regs ? instruction_pointer(regs) : 0; irqreturn_t retval = IRQ_NONE; unsigned int flags = 0, irq = desc->irq_data.irq; @@ -172,7 +174,11 @@ handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action) action = action->next; } while (action); - add_interrupt_randomness(irq, flags); +#ifndef CONFIG_PREEMPT_RT_FULL + add_interrupt_randomness(irq, flags, ip); +#else + desc->random_ip = ip; +#endif if (!noirqdebug) note_interrupt(irq, desc, retval); diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 037d2cd..11be231 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -942,6 +942,12 @@ static int irq_thread(void *data) if (action_ret == IRQ_HANDLED) atomic_inc(&desc->threads_handled); +#ifdef CONFIG_PREEMPT_RT_FULL + migrate_disable(); + add_interrupt_randomness(action->irq, 0, + desc->random_ip ^ (unsigned long) action); + migrate_enable(); +#endif wake_threads_waitq(desc); } |