linux-kernel - Re: [PATCH] Remove "#ifdef linux" from include/linux/a.out.h

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Message-ID: <CACysShg0jEF6ON8svrBYBEZhZtNfW-WAZMBvcwyixndnawcG1w@mail.gmail.com>
Date:	Tue, 31 Mar 2015 15:20:46 +0300
From:	Alexander Ivchenko <aivchenk@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Remove "#ifdef linux" from include/linux/a.out.h

Hi,

Could somebody please take a look at the patch?

thanks,
Alexander

2015-03-10 16:03 GMT+03:00 Alexander Ivchenko <aivchenk@...il.com>:
> Hi,
>
> I'm resending the patch from here:
> http://lkml.iu.edu/hypermail/linux/kernel/1502.3/00286.html
>
> GCC fixincludes always change that header to comply with C standard.
> Here is the comment from fixincludes code:
> /* Fix for machine name #ifdefs that are not in the namespace reserved
>    by the C standard.  They won't be defined if compiling with -ansi,
>    and the headers will break.  We go to some trouble to only change
>    #ifdefs where the macro is defined by GCC in non-ansi mode; this
>    minimizes the number of headers touched.  */
>
> So gcc build system will change "#ifdef linux" to "#ifdef __linux__".
>
> After talking to Andi Kleen, I was proposed to remove that ifdef completely
> (instead of changing linux to __linux__ in the header), since it does
> not make much sense to include linux/a.out.h on a non linux system.
>
> The following patch does that, is it ok?
>
> From: Alexander Ivchenko <alexander.ivchenko@...el.com>
> Date: Tue, 24 Feb 2015 11:28:20 +0300
> Subject: [PATCH] Remove "ifdef linux" guard from include/linux/a.out.h.
>
> Signed-off-by: Alexander Ivchenko <alexander.ivchenko@...el.com>
> ---
>  include/linux/a.out.h | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/include/linux/a.out.h b/include/linux/a.out.h
> index e86dfca..47e647f 100644
> --- a/include/linux/a.out.h
> +++ b/include/linux/a.out.h
> @@ -129,7 +129,6 @@ enum machine_type {
>  #define SEGMENT_SIZE PAGE_SIZE
>  #endif
>
> -#ifdef linux
>  #ifdef __KERNEL__
>  #include <asm/page.h>
>  #else
> @@ -146,7 +145,6 @@ enum machine_type {
>  #endif
>  #endif
>  #endif
> -#endif
>
>  #define _N_SEGMENT_ROUND(x) ALIGN(x, SEGMENT_SIZE)
>
> --
> 1.9.3
>
>
>
> thanks,
> Alexander
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