^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This file contains spurious interrupt handling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "internals.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static int irqfixup __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static void poll_spurious_irqs(struct timer_list *unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static int irq_poll_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static atomic_t irq_poll_active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * We wait here for a poller to finish.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * If the poll runs on this CPU, then we yell loudly and return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * false. That will leave the interrupt line disabled in the worst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * case, but it should never happen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * We wait until the poller is done and then recheck disabled and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * action (about to be disabled). Only if it's still active, we return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * true and let the handler run.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) bool irq_wait_for_poll(struct irq_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) __must_hold(&desc->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (WARN_ONCE(irq_poll_cpu == smp_processor_id(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) "irq poll in progress on cpu %d for irq %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) smp_processor_id(), desc->irq_data.irq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) raw_spin_unlock(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) while (irqd_irq_inprogress(&desc->irq_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) raw_spin_lock(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) } while (irqd_irq_inprogress(&desc->irq_data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* Might have been disabled in meantime */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return !irqd_irq_disabled(&desc->irq_data) && desc->action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * Recovery handler for misrouted interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static int try_one_irq(struct irq_desc *desc, bool force)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) irqreturn_t ret = IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct irqaction *action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) raw_spin_lock(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * PER_CPU, nested thread interrupts and interrupts explicitly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * marked polled are excluded from polling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (irq_settings_is_per_cpu(desc) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) irq_settings_is_nested_thread(desc) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) irq_settings_is_polled(desc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * Do not poll disabled interrupts unless the spurious
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * disabled poller asks explicitly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (irqd_irq_disabled(&desc->irq_data) && !force)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * All handlers must agree on IRQF_SHARED, so we test just the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) action = desc->action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (!action || !(action->flags & IRQF_SHARED) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) (action->flags & __IRQF_TIMER))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* Already running on another processor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (irqd_irq_inprogress(&desc->irq_data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * Already running: If it is shared get the other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * CPU to go looking for our mystery interrupt too
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) desc->istate |= IRQS_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* Mark it poll in progress */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) desc->istate |= IRQS_POLL_INPROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (handle_irq_event(desc) == IRQ_HANDLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ret = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* Make sure that there is still a valid action */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) action = desc->action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) } while ((desc->istate & IRQS_PENDING) && action);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) desc->istate &= ~IRQS_POLL_INPROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) raw_spin_unlock(&desc->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return ret == IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static int misrouted_irq(int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) int i, ok = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (atomic_inc_return(&irq_poll_active) != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) irq_poll_cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) for_each_irq_desc(i, desc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (i == irq) /* Already tried */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (try_one_irq(desc, false))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ok = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) atomic_dec(&irq_poll_active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /* So the caller can adjust the irq error counts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static void poll_spurious_irqs(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct irq_desc *desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (atomic_inc_return(&irq_poll_active) != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) irq_poll_cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) for_each_irq_desc(i, desc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) unsigned int state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (!i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* Racy but it doesn't matter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) state = desc->istate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (!(state & IRQS_SPURIOUS_DISABLED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) try_one_irq(desc, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) local_irq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) atomic_dec(&irq_poll_active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) mod_timer(&poll_spurious_irq_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static inline int bad_action_ret(irqreturn_t action_ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) unsigned int r = action_ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (likely(r <= (IRQ_HANDLED | IRQ_WAKE_THREAD)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * If 99,900 of the previous 100,000 interrupts have not been handled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * then assume that the IRQ is stuck in some manner. Drop a diagnostic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * and try to turn the IRQ off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * (The other 100-of-100,000 interrupts may have been a correctly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * functioning device sharing an IRQ with the failing one)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static void __report_bad_irq(struct irq_desc *desc, irqreturn_t action_ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) unsigned int irq = irq_desc_get_irq(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct irqaction *action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (bad_action_ret(action_ret)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) printk(KERN_ERR "irq event %d: bogus return value %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) irq, action_ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) printk(KERN_ERR "irq %d: nobody cared (try booting with "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) "the \"irqpoll\" option)\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) printk(KERN_ERR "handlers:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * We need to take desc->lock here. note_interrupt() is called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * w/o desc->lock held, but IRQ_PROGRESS set. We might race
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * with something else removing an action. It's ok to take
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * desc->lock here. See synchronize_irq().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) raw_spin_lock_irqsave(&desc->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) for_each_action_of_desc(desc, action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) printk(KERN_ERR "[<%p>] %ps", action->handler, action->handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (action->thread_fn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) printk(KERN_CONT " threaded [<%p>] %ps",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) action->thread_fn, action->thread_fn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) printk(KERN_CONT "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) raw_spin_unlock_irqrestore(&desc->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static void report_bad_irq(struct irq_desc *desc, irqreturn_t action_ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static int count = 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (count > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) __report_bad_irq(desc, action_ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) irqreturn_t action_ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) struct irqaction *action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (!irqfixup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* We didn't actually handle the IRQ - see if it was misrouted? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (action_ret == IRQ_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * But for 'irqfixup == 2' we also do it for handled interrupts if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * they are marked as IRQF_IRQPOLL (or for irq zero, which is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * traditional PC timer interrupt.. Legacy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (irqfixup < 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (!irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * Since we don't get the descriptor lock, "action" can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * change under us. We don't really care, but we don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * want to follow a NULL pointer. So tell the compiler to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * just load it once by using a barrier.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) action = desc->action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return action && (action->flags & IRQF_IRQPOLL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) #define SPURIOUS_DEFERRED 0x80000000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) void note_interrupt(struct irq_desc *desc, irqreturn_t action_ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (desc->istate & IRQS_POLL_INPROGRESS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) irq_settings_is_polled(desc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (bad_action_ret(action_ret)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) report_bad_irq(desc, action_ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * We cannot call note_interrupt from the threaded handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * because we need to look at the compound of all handlers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * (primary and threaded). Aside of that in the threaded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * shared case we have no serialization against an incoming
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * hardware interrupt while we are dealing with a threaded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * result.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * So in case a thread is woken, we just note the fact and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * defer the analysis to the next hardware interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * The threaded handlers store whether they successfully
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * handled an interrupt and we check whether that number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * changed versus the last invocation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) * We could handle all interrupts with the delayed by one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * mechanism, but for the non forced threaded case we'd just
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * add pointless overhead to the straight hardirq interrupts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * for the sake of a few lines less code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (action_ret & IRQ_WAKE_THREAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * There is a thread woken. Check whether one of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * shared primary handlers returned IRQ_HANDLED. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * not we defer the spurious detection to the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if (action_ret == IRQ_WAKE_THREAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) int handled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * We use bit 31 of thread_handled_last to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * denote the deferred spurious detection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * active. No locking necessary as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * thread_handled_last is only accessed here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) * and we have the guarantee that hard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) * interrupts are not reentrant.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (!(desc->threads_handled_last & SPURIOUS_DEFERRED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) desc->threads_handled_last |= SPURIOUS_DEFERRED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * Check whether one of the threaded handlers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * returned IRQ_HANDLED since the last
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * interrupt happened.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * For simplicity we just set bit 31, as it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * set in threads_handled_last as well. So we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * avoid extra masking. And we really do not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * care about the high bits of the handled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * count. We just care about the count being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * different than the one we saw before.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) handled = atomic_read(&desc->threads_handled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) handled |= SPURIOUS_DEFERRED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (handled != desc->threads_handled_last) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) action_ret = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * Note: We keep the SPURIOUS_DEFERRED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * bit set. We are handling the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * previous invocation right now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * Keep it for the current one, so the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * next hardware interrupt will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * account for it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) desc->threads_handled_last = handled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * None of the threaded handlers felt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * responsible for the last interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * We keep the SPURIOUS_DEFERRED bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * set in threads_handled_last as we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * need to account for the current
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * interrupt as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) action_ret = IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) * One of the primary handlers returned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * IRQ_HANDLED. So we don't care about the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * threaded handlers on the same line. Clear
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * the deferred detection bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) * In theory we could/should check whether the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * deferred bit is set and take the result of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * the previous run into account here as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * well. But it's really not worth the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * trouble. If every other interrupt is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * handled we never trigger the spurious
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * detector. And if this is just the one out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * of 100k unhandled ones which is handled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * then we merily delay the spurious detection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * by one hard interrupt. Not a real problem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) desc->threads_handled_last &= ~SPURIOUS_DEFERRED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (unlikely(action_ret == IRQ_NONE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * If we are seeing only the odd spurious IRQ caused by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * bus asynchronicity then don't eventually trigger an error,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * otherwise the counter becomes a doomsday timer for otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) * working systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (time_after(jiffies, desc->last_unhandled + HZ/10))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) desc->irqs_unhandled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) desc->irqs_unhandled++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) desc->last_unhandled = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) irq = irq_desc_get_irq(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (unlikely(try_misrouted_irq(irq, desc, action_ret))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) int ok = misrouted_irq(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (action_ret == IRQ_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) desc->irqs_unhandled -= ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) desc->irq_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (likely(desc->irq_count < 100000))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) desc->irq_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (unlikely(desc->irqs_unhandled > 99900)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * The interrupt is stuck
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) __report_bad_irq(desc, action_ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * Now kill the IRQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) desc->istate |= IRQS_SPURIOUS_DISABLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) desc->depth++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) irq_disable(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) mod_timer(&poll_spurious_irq_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) desc->irqs_unhandled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) bool noirqdebug __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) int noirqdebug_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) noirqdebug = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) printk(KERN_INFO "IRQ lockup detection disabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) __setup("noirqdebug", noirqdebug_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) module_param(noirqdebug, bool, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) static int __init irqfixup_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) irqfixup = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) printk(KERN_WARNING "This may impact system performance.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) __setup("irqfixup", irqfixup_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) module_param(irqfixup, int, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) static int __init irqpoll_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) irqfixup = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) "enabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) printk(KERN_WARNING "This may significantly impact system "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) "performance\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) __setup("irqpoll", irqpoll_setup);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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