[PATCH v2] gpio: vr41xx: Use spurious_interrupt() and export it to modules

[PATCH v2] gpio: vr41xx: Use spurious_interrupt() and export it to modules

[Genjian Zhang]

From: huhai <huhai@kylinos.cn>

modpost complains once these drivers become modules.
  ERROR: modpost: "irq_err_count" [drivers/gpio/gpio-vr41xx.ko] undefined!

Fix it by use spurious_interrupt() and export spurious_interrupt() when
that symbol is =m.

Fixes: 27fdd325dace ("MIPS: Update VR41xx GPIO driver to use gpiolib")
Suggested-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Reported-by: k2ci <kernel-bot@kylinos.cn>
Signed-off-by: huhai <huhai@kylinos.cn>
---
 arch/mips/kernel/irq.c     | 3 +++
 drivers/gpio/gpio-vr41xx.c | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
index 5e11582fe308..69f9a46bf9e5 100644
--- a/arch/mips/kernel/irq.c
+++ b/arch/mips/kernel/irq.c
@@ -49,6 +49,9 @@ asmlinkage void spurious_interrupt(void)
 {
 	atomic_inc(&irq_err_count);
 }
+#ifdef CONFIG_GPIO_VR41XX_MODULE
+EXPORT_SYMBOL_GPL(spurious_interrupt);
+#endif
 
 void __init init_IRQ(void)
 {
diff --git a/drivers/gpio/gpio-vr41xx.c b/drivers/gpio/gpio-vr41xx.c
index 98cd715ccc33..8f27a0e0ad99 100644
--- a/drivers/gpio/gpio-vr41xx.c
+++ b/drivers/gpio/gpio-vr41xx.c
@@ -217,7 +217,7 @@ static int giu_get_irq(unsigned int irq)
 	printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
 	       maskl, pendl, maskh, pendh);
 
-	atomic_inc(&irq_err_count);
+	spurious_interrupt();
 
 	return -EINVAL;
 }
-- 
2.27.0

Re: [PATCH v2] gpio: vr41xx: Use spurious_interrupt() and export it to modules

[Florian Fainelli]

On 5/23/22 20:28, Genjian Zhang wrote:
> From: huhai <huhai@kylinos.cn>
> 
> modpost complains once these drivers become modules.
>    ERROR: modpost: "irq_err_count" [drivers/gpio/gpio-vr41xx.ko] undefined!
> 
> Fix it by use spurious_interrupt() and export spurious_interrupt() when
> that symbol is =m.
> 
> Fixes: 27fdd325dace ("MIPS: Update VR41xx GPIO driver to use gpiolib")
> Suggested-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Reported-by: k2ci <kernel-bot@kylinos.cn>
> Signed-off-by: huhai <huhai@kylinos.cn>
> ---
>   arch/mips/kernel/irq.c     | 3 +++
>   drivers/gpio/gpio-vr41xx.c | 2 +-
>   2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
> index 5e11582fe308..69f9a46bf9e5 100644
> --- a/arch/mips/kernel/irq.c
> +++ b/arch/mips/kernel/irq.c
> @@ -49,6 +49,9 @@ asmlinkage void spurious_interrupt(void)
>   {
>   	atomic_inc(&irq_err_count);
>   }
> +#ifdef CONFIG_GPIO_VR41XX_MODULE
> +EXPORT_SYMBOL_GPL(spurious_interrupt);
> +#endif

You should not be exporting for just a specific configuration, export it 
unconditionally. The generic IRQ layer however prefers to use 
handle_bad_irq() which is already exported, can you consider using that?
-- 
Florian