linux-kernel - Re: [PATCH] m68k: add missing types to asm/irq.h

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Date:   Wed, 4 Oct 2023 17:16:15 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rolf Eike Beer <eike-kernel@...tec.de>
Cc:     Simon Horman <horms@...nel.org>, linux-m68k@...ts.linux-m68k.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68k: add missing types to asm/irq.h

Hi Rolf,

Thanks for your patch!

On Sun, Sep 17, 2023 at 11:18 AM Rolf Eike Beer <eike-kernel@...tec.de> wrote:
> As reported in f8b648bf6628 ("net: sunhme: move asm includes to below linux
> includes") when including this <asm/*> header before the needed <linux/*>
> headers the compilation will fail because of missing types.

    arch/m68k/include/asm/irq.h:66:20: warning: ‘struct pt_regs’
declared inside parameter list will not be visible outside of this
definition or declaration
       66 |             struct pt_regs *));
          |                    ^~~~~~~
    arch/m68k/include/asm/irq.h:78:11: error: expected ‘;’ before ‘void’
       78 | asmlinkage void do_IRQ(int irq, struct pt_regs *regs);
          |           ^~~~~
          |           ;
    arch/m68k/include/asm/irq.h:78:40: warning: ‘struct pt_regs’
declared inside parameter list will not be visible outside of this
definition or declaration
       78 | asmlinkage void do_IRQ(int irq, struct pt_regs *regs);
          |                                        ^~~~~~~
    arch/m68k/include/asm/irq.h:79:8: error: unknown type name ‘atomic_t’
       79 | extern atomic_t irq_err_count;
          |        ^~~~~~~~

> Signed-off-by: Rolf Eike Beer <eike-kernel@...tec.de>

> --- a/arch/m68k/include/asm/irq.h
> +++ b/arch/m68k/include/asm/irq.h
> @@ -2,6 +2,8 @@
>  #ifndef _M68K_IRQ_H_
>  #define _M68K_IRQ_H_
>
> +#include <linux/types.h>

When just including this file, that still leads to:

    arch/m68k/include/asm/irq.h:82:11: error: expected ‘;’ before ‘void’
       82 | asmlinkage void do_IRQ(int irq, struct pt_regs *regs);
          |           ^~~~~
          |           ;

Instead, you want:

    #include <linux/atomic.h>
    #include <linux/linkage.h>

> +
>  /*
>   * This should be the same as the max(NUM_X_SOURCES) for all the
>   * different m68k hosts compiled into the kernel.
> @@ -59,6 +61,7 @@
>  struct irq_data;
>  struct irq_chip;
>  struct irq_desc;
> +struct pt_regs;

OK

>  extern unsigned int m68k_irq_startup(struct irq_data *data);
>  extern unsigned int m68k_irq_startup_irq(unsigned int irq);
>  extern void m68k_irq_shutdown(struct irq_data *data);

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
i.e. will queue in the m68k for-v6.7 branch, with the above fixed.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds