Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux...

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kernel / irq_64.c

diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 60eb84eb77a0a34232be8aafbe8a7d1e040f454f..6383d50f82ea11e93220a9fd45b9f0fc466860e6 100644 (file)
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -13,12 +13,12 @@
 #include <linux/seq_file.h>
 #include <linux/module.h>
 #include <linux/delay.h>
+#include <linux/ftrace.h>
 #include <asm/uaccess.h>
 #include <asm/io_apic.h>
 #include <asm/idle.h>
 #include <asm/smp.h>
 
-#ifdef CONFIG_DEBUG_STACKOVERFLOW
 /*
  * Probabilistic stack overflow check:
  *
@@ -28,26 +28,25 @@
  */
 static inline void stack_overflow_check(struct pt_regs *regs)
 {
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
        u64 curbase = (u64)task_stack_page(current);
-       static unsigned long warned = -60*HZ;
-
-       if (regs->sp >= curbase && regs->sp <= curbase + THREAD_SIZE &&
-           regs->sp <  curbase + sizeof(struct thread_info) + 128 &&
-           time_after(jiffies, warned + 60*HZ)) {
-               printk("do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n",
-                      current->comm, curbase, regs->sp);
-               show_stack(NULL,NULL);
-               warned = jiffies;
-       }
-}
+
+       WARN_ONCE(regs->sp >= curbase &&
+                 regs->sp <= curbase + THREAD_SIZE &&
+                 regs->sp <  curbase + sizeof(struct thread_info) +
+                                       sizeof(struct pt_regs) + 128,
+
+                 "do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n",
+                       current->comm, curbase, regs->sp);
 #endif
+}
 
 /*
  * do_IRQ handles all normal device IRQ's (the special
  * SMP cross-CPU interrupts have their own specific
  * handlers).
  */
-asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
+asmlinkage unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
 {
        struct pt_regs *old_regs = set_irq_regs(regs);
        struct irq_desc *desc;
@@ -60,9 +59,7 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
        irq_enter();
        irq = __get_cpu_var(vector_irq)[vector];
 
-#ifdef CONFIG_DEBUG_STACKOVERFLOW
        stack_overflow_check(regs);
-#endif
 
        desc = irq_to_desc(irq);
        if (likely(desc))
@@ -83,40 +80,43 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-void fixup_irqs(cpumask_t map)
+/* A cpu has been removed from cpu_online_mask.  Reset irq affinities. */
+void fixup_irqs(void)
 {
        unsigned int irq;
        static int warned;
        struct irq_desc *desc;
 
        for_each_irq_desc(irq, desc) {
-               cpumask_t mask;
                int break_affinity = 0;
                int set_affinity = 1;
+               const struct cpumask *affinity;
 
+               if (!desc)
+                       continue;
                if (irq == 2)
                        continue;
 
                /* interrupt's are disabled at this point */
                spin_lock(&desc->lock);
 
+               affinity = &desc->affinity;
                if (!irq_has_action(irq) ||
-                   cpus_equal(desc->affinity, map)) {
+                   cpumask_equal(affinity, cpu_online_mask)) {
                        spin_unlock(&desc->lock);
                        continue;
                }
 
-               cpus_and(mask, desc->affinity, map);
-               if (cpus_empty(mask)) {
+               if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
                        break_affinity = 1;
-                       mask = map;
+                       affinity = cpu_all_mask;
                }
 
                if (desc->chip->mask)
                        desc->chip->mask(irq);
 
                if (desc->chip->set_affinity)
-                       desc->chip->set_affinity(irq, mask);
+                       desc->chip->set_affinity(irq, affinity);
                else if (!(warned++))
                        set_affinity = 0;