linux-kernel - Re: uapi elf: delete unused macros

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Date:	Mon, 11 Apr 2016 23:05:06 +1000 (AEST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	慕冬亮 <mudongliangabcd@...il.com>,
	benh@...nel.crashing.org, paulus@...ba.org,
	mudongliangabcd@...il.com, will.deacon@....com,
	takahiro.akashi@...aro.org
Cc:	linux-api@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: uapi elf: delete unused macros

On Fri, 2015-06-11 at 14:45:47 UTC, =?utf-8?b?5oWV5Yas5Lqu?= wrote:
> >From 13f516acc709d88d3162e92bc891c8e39cc9fc1a Mon Sep 17 00:00:00 2001
> From: mudongliang <mudongliangabcd@...il.com>
> Date: Fri, 6 Nov 2015 14:35:19 +0800
> Subject: [PATCH] unify the comment form and delete unused macros
> 
> diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
> index 71e1d0e..ff81b20 100644
> --- a/include/uapi/linux/elf.h
> +++ b/include/uapi/linux/elf.h
> @@ -342,15 +342,13 @@ typedef struct elf64_shdr {
>  #define	ELFCLASSNONE	0		/* EI_CLASS */
>  #define	ELFCLASS32	1
>  #define	ELFCLASS64	2
> -#define	ELFCLASSNUM	3
>  
> -#define ELFDATANONE	0		/* e_ident[EI_DATA] */
> +#define ELFDATANONE	0		/* EI_DATA */
>  #define ELFDATA2LSB	1
>  #define ELFDATA2MSB	2
>  
> -#define EV_NONE		0		/* e_version, EI_VERSION */
> +#define EV_NONE		0		/* EI_VERSION */
>  #define EV_CURRENT	1
> -#define EV_NUM		2

How do you know there isn't a userspace program somewhere that's using this
definition?

cheers