linux-kernel - Re: Linux-3.4-rc7 [build failure]

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Message-ID: <alpine.LFD.2.02.1205131648110.3231@ionos>
Date:	Sun, 13 May 2012 17:16:30 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jiri Kosina <jkosina@...e.cz>
cc:	Paweł Sikora <pluto@...-linux.org>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Linux-3.4-rc7 [build failure]

On Sun, 13 May 2012, Jiri Kosina wrote:
> On Sun, 13 May 2012, Paweł Sikora wrote:
> 
> > Hi all,
> > i see a build failure on modular kernel.
> > 
> > (...)
> > Kernel: arch/x86/boot/bzImage is ready  (#15)
> >   MODPOST 3501 modules
> > ERROR: "handle_edge_irq" [drivers/gpio/gpio-pch.ko] undefined!
> > ERROR: "irq_to_desc" [drivers/gpio/gpio-pch.ko] undefined!
> > WARNING: modpost: Found 4 section mismatch(es).
> > (...)
> 
> This is caused by
> 
> commit df9541a60af0985c3a756dc5f99b9253d2565a07
> Author: Thomas Gleixner <tglx@...utronix.de>
> Date:   Sat Apr 28 10:13:45 2012 +0200
> 
>     gpio: pch9: Use proper flow type handlers
> 
> 
> as it adds
> 
> 	__irq_set_handler_locked(d->irq, handle_edge_irq);
> 
> but handle_edge_irq() is not exported for modules (and inlined 
> __irq_set_handler_locked() requires irq_to_desc() exported as well)
> 
> Thus the patch below fixes it; adding Thomas to CC to get his Ack for this 
> first though.

Hrmpf. I'll take it via irg/urgent

> 
> 
> From: Jiri Kosina <jkosina@...e.cz>
> Subject: [PATCH] genirq: export handle_edge_irq() and irq_to_desc()
> 
> Export handle_edge_irq() and irq_to_desc() to modules to allow them to
> do things such as
> 
> 	__irq_set_handler_locked(...., handle_edge_irq);
> 
> This fixes
> 
> 	ERROR: "handle_edge_irq" [drivers/gpio/gpio-pch.ko] undefined!
> 	ERROR: "irq_to_desc" [drivers/gpio/gpio-pch.ko] undefined!
> 
> when gpio-pch is being built as a module.
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> ---
>  kernel/irq/chip.c    |    1 +
>  kernel/irq/irqdesc.c |    1 +
>  2 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index 6080f6b..3914c1e 100644
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@ -518,6 +518,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
>  out_unlock:
>  	raw_spin_unlock(&desc->lock);
>  }
> +EXPORT_SYMBOL(handle_edge_irq);
>  
>  #ifdef CONFIG_IRQ_EDGE_EOI_HANDLER
>  /**
> diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
> index d86e254..192a302 100644
> --- a/kernel/irq/irqdesc.c
> +++ b/kernel/irq/irqdesc.c
> @@ -112,6 +112,7 @@ struct irq_desc *irq_to_desc(unsigned int irq)
>  {
>  	return radix_tree_lookup(&irq_desc_tree, irq);
>  }
> +EXPORT_SYMBOL(irq_to_desc);
>  
>  static void delete_irq_desc(unsigned int irq)
>  {
> 
> -- 
> Jiri Kosina
> SUSE Labs
> 
>