Merge tag 'gpio-v5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
 "Some late fixes: one IRQ issue and one compilation issue for UML.

   - Fix a compilation issue with User Mode Linux

   - Handle spurious interrupts properly in the PCA953x driver"

* tag 'gpio-v5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: pca953x: Survive spurious interrupts
  gpiolib: Disable compat ->read() code in UML case

Author: torvalds

drivers/gpio/gpio-pca953x.c

@@ -824,8 +824,21 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 	ret = pca953x_irq_pending(chip, pending);
 	mutex_unlock(&chip->i2c_lock);
 
-	for_each_set_bit(level, pending, gc->ngpio)
-		handle_nested_irq(irq_find_mapping(gc->irq.domain, level));
+	if (ret) {
+		ret = 0;
+
+		for_each_set_bit(level, pending, gc->ngpio) {
+			int nested_irq = irq_find_mapping(gc->irq.domain, level);
+
+			if (unlikely(nested_irq <= 0)) {
+				dev_warn_ratelimited(gc->parent, "unmapped interrupt %d\n", level);
+				continue;
+			}
+
+			handle_nested_irq(nested_irq);
+			ret = 1;
+		}
+	}
 
 	return IRQ_RETVAL(ret);
 }

drivers/gpio/gpiolib-cdev.c

@@ -425,7 +425,7 @@ static __poll_t lineevent_poll(struct file *file,
 
 static ssize_t lineevent_get_size(void)
 {
-#ifdef __x86_64__
+#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
 	/* i386 has no padding after 'id' */
 	if (in_ia32_syscall()) {
 		struct compat_gpioeevent_data {