diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-08-21 20:38:50 +0200 |
|---|---|---|
| committer | Daniel Wagner <wagi@monom.org> | 2018-07-26 06:47:21 +0200 |
| commit | 2a55c745c7e761d31ea30434406b6128abc22dda (patch) | |
| tree | 95a88c9bb7fd51f51a6d5968a3d9df88c56878fd /kernel/irq | |
| parent | 2a2ca5f9a624ea92432feded53079696c4ed077a (diff) | |
| download | linux-rt-2a55c745c7e761d31ea30434406b6128abc22dda.tar.gz | |
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>
Diffstat (limited to 'kernel/irq')
| -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 57bff7857e87..6c65c9252991 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -134,6 +134,8 @@ void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action) irqreturn_t handle_irq_event_percpu(struct irq_desc *desc) { + 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; struct irqaction *action = desc->action; @@ -176,7 +178,11 @@ irqreturn_t handle_irq_event_percpu(struct irq_desc *desc) action = action->next; } - add_interrupt_randomness(irq, flags); +#ifdef CONFIG_PREEMPT_RT_FULL + desc->random_ip = ip; +#else + add_interrupt_randomness(irq, flags, ip); +#endif if (!noirqdebug) note_interrupt(desc, retval); diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 71f479196709..ab1ec5b20887 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1045,6 +1045,12 @@ static int irq_thread(void *data) if (action_ret == IRQ_WAKE_THREAD) irq_wake_secondary(desc, action); +#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); } |