linux-kernel - Re: [PATCH v5 1/6] asm-generic/bug.h: declare struct pt

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Date:   Thu, 8 Jun 2017 10:07:31 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ian Abbott <abbotti@....co.uk>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...e.de>,
        Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Michal Nazarewicz <mina86@...a86.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v5 1/6] asm-generic/bug.h: declare struct pt_regs;
 before function prototype

On Thu, 25 May 2017 13:03:11 +0100
Ian Abbott <abbotti@....co.uk> wrote:

> The declaration of `__warn()` has `struct pt_regs *regs` as one of its
> parameters.  This can result in compiler warnings if `struct regs` is
> not already declared.  Add an empty declaration of `struct pt_regs` to
> avoid the warnings.
> 

Not sure if this has been pulled already or not, but I have a small nit.

> Signed-off-by: Ian Abbott <abbotti@....co.uk>
> Cc: Arnd Bergmann <arnd@...db.de>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> Acked-by: Michal Nazarewicz <mina86@...a86.com>
> ---
> v3: Actually, there was no v1 or v2.  I called this v3 to match the
> series.
> v4: Corrected 'Acked-by:' line in patch description.
> v5: Added Acked-by for Michal Nazarewicz.
> ---
>  include/asm-generic/bug.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
> index d6f4aed479a1..87191357d303 100644
> --- a/include/asm-generic/bug.h
> +++ b/include/asm-generic/bug.h
> @@ -97,6 +97,7 @@ extern void warn_slowpath_null(const char *file, const int line);
>  
>  /* used internally by panic.c */
>  struct warn_args;
> +struct pt_regs;

Probably be better to move pt_regs above the comment. For one, it is
used before warn_args in the function below. Two, it's not defined
internally by panic.c like warn_args is.

-- Steve


>  
>  void __warn(const char *file, int line, void *caller, unsigned taint,
>  	    struct pt_regs *regs, struct warn_args *args);