linux-kernel - Re: [PATCH v5 4/6] linux/bug.h: correct "space required before that '-'"

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Message-ID: <xa1t7f15hw7i.fsf@mina86.com>
Date:   Thu, 25 May 2017 16:01:21 +0200
From:   Michal Nazarewicz <mina86@...a86.com>
To:     Ian Abbott <abbotti@....co.uk>, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Cc:     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>,
        Ian Abbott <abbotti@....co.uk>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v5 4/6] linux/bug.h: correct "space required before that '-'"

On Thu, May 25 2017, Ian Abbott wrote:
> Correct these checkpatch.pl errors:
>
> |ERROR: space required before that '-' (ctx:OxO)
> |#37: FILE: include/linux/bug.h:37:
> |+#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
>
> |ERROR: space required before that '-' (ctx:OxO)
> |#38: FILE: include/linux/bug.h:38:
> |+#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
>
> I decided to wrap the bitfield expressions that begin with minus signs
> in parentheses rather than insert spaces before the minus signs.
>
> Signed-off-by: Ian Abbott <abbotti@....co.uk>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

> ---
> v5: Actually, there was no v1 thru v4.  I called this v5 to match the
> series.
> ---
>  include/linux/bug.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/bug.h b/include/linux/bug.h
> index 216a1b79653d..483207cb99fb 100644
> --- a/include/linux/bug.h
> +++ b/include/linux/bug.h
> @@ -36,8 +36,8 @@ struct pt_regs;
>   * e.g. in a structure initializer (or where-ever else comma expressions
>   * aren't permitted).
>   */
> -#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
> -#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
> +#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
> +#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:(-!!(e)); }))
>  
>  /*
>   * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»