linux-kernel - Re: AW: [RFC v3 04/17] arch_prctl.2: SYNOPSIS: Remove unused includes

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Date:   Tue, 16 Mar 2021 17:50:46 +0100
From:   "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
To:     Walter Harms <wharms@....de>
Cc:     "linux-man@...r.kernel.org" <linux-man@...r.kernel.org>,
        "libc-alpha@...rceware.org" <libc-alpha@...rceware.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Florian Weimer <fweimer@...hat.com>,
        "mtk.manpages@...il.com" <mtk.manpages@...il.com>
Subject: Re: AW: [RFC v3 04/17] arch_prctl.2: SYNOPSIS: Remove unused includes

Hi Walter,

On 3/15/21 7:00 PM, Walter Harms wrote:
> I have learned the other way around:
> #include <sys/prctl.h>
> Is a general system header to use that may include
> the asm/prctrl.h what should never be included by
> userspace programms.
> 

Are you sure that <sys/prctl.h> includes <asm/prctl.h>?

user@...ian:/usr/include$ grep -rn '\bARCH_'
asm-generic/statfs.h:42:#ifndef ARCH_PACK_STATFS64
asm-generic/statfs.h:43:#define ARCH_PACK_STATFS64
asm-generic/statfs.h:59:} ARCH_PACK_STATFS64;
asm-generic/statfs.h:65:#ifndef ARCH_PACK_COMPAT_STATFS64
asm-generic/statfs.h:66:#define ARCH_PACK_COMPAT_STATFS64
asm-generic/statfs.h:82:} ARCH_PACK_COMPAT_STATFS64;
x86_64-linux-gnu/asm/statfs.h:10:#define ARCH_PACK_COMPAT_STATFS64 
__attribute__((packed,aligned(4)))
x86_64-linux-gnu/asm/prctl.h:5:#define ARCH_SET_GS		0x1001
x86_64-linux-gnu/asm/prctl.h:6:#define ARCH_SET_FS		0x1002
x86_64-linux-gnu/asm/prctl.h:7:#define ARCH_GET_FS		0x1003
x86_64-linux-gnu/asm/prctl.h:8:#define ARCH_GET_GS		0x1004
x86_64-linux-gnu/asm/prctl.h:10:#define ARCH_GET_CPUID		0x1011
x86_64-linux-gnu/asm/prctl.h:11:#define ARCH_SET_CPUID		0x1012
x86_64-linux-gnu/asm/prctl.h:13:#define ARCH_MAP_VDSO_X32	0x2001
x86_64-linux-gnu/asm/prctl.h:14:#define ARCH_MAP_VDSO_32	0x2002
x86_64-linux-gnu/asm/prctl.h:15:#define ARCH_MAP_VDSO_64	0x2003
x86_64-linux-gnu/asm/auxvec.h:13:/* entries in ARCH_DLINFO: */
user@...ian:/usr/include$ grep -rn 'asm/prctl.h'
user@...ian:/usr/include$

At least on my system, no header seems to be including <asm/prctl.h>.

Thanks,

Alex



-- 
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/