From mboxrd@z Thu Jan  1 00:00:00 1970
X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/2307
Path: news.gmane.org!not-for-mail
From: Justin Cormack <justin@specialbusservice.com>
Newsgroups: gmane.linux.lib.musl.general
Subject: sysinfo padding question
Date: Sun, 18 Nov 2012 20:25:48 +0000
Message-ID: <CAK4o1WxKAL-Tf+SnO5BS-jVv5D+xXeKF5WW7XcOQTkr0EaGimA@mail.gmail.com>
Reply-To: musl@lists.openwall.com
NNTP-Posting-Host: plane.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
X-Trace: ger.gmane.org 1353270360 21242 80.91.229.3 (18 Nov 2012 20:26:00 GMT)
X-Complaints-To: usenet@ger.gmane.org
NNTP-Posting-Date: Sun, 18 Nov 2012 20:26:00 +0000 (UTC)
To: musl@lists.openwall.com
Original-X-From: musl-return-2308-gllmg-musl=m.gmane.org@lists.openwall.com Sun Nov 18 21:26:11 2012
Return-path: <musl-return-2308-gllmg-musl=m.gmane.org@lists.openwall.com>
Envelope-to: gllmg-musl@plane.gmane.org
Original-Received: from mother.openwall.net ([195.42.179.200])
	by plane.gmane.org with smtp (Exim 4.69)
	(envelope-from <musl-return-2308-gllmg-musl=m.gmane.org@lists.openwall.com>)
	id 1TaBRT-0002IP-8c
	for gllmg-musl@plane.gmane.org; Sun, 18 Nov 2012 21:26:11 +0100
Original-Received: (qmail 7375 invoked by uid 550); 18 Nov 2012 20:26:01 -0000
Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm
Precedence: bulk
List-Post: <mailto:musl@lists.openwall.com>
List-Help: <mailto:musl-help@lists.openwall.com>
List-Unsubscribe: <mailto:musl-unsubscribe@lists.openwall.com>
List-Subscribe: <mailto:musl-subscribe@lists.openwall.com>
Original-Received: (qmail 7367 invoked from network); 18 Nov 2012 20:26:00 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=specialbusservice.com; s=google;
        h=mime-version:date:message-id:subject:from:to:content-type;
        bh=XCMA4JpWSqXxHRfKIpZw8OgSOgywOjR09TiW8uBlQOA=;
        b=giYs2LxpkwtEptA5H6uG251w6/UxCTnO9l2E4gQpwGWTVN81Bk2e76lywptYPEmVCu
         7qhmWqSZDmNsQ0Hjci2YeGc4M1LPDmQWp80AA5p78vhutH1lZ2KOoz1GYKQy0TtA3BpZ
         lao5RGpaICltuVR8K7XXkUcYu4mwi4bC6Cnvk=
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=google.com; s=20120113;
        h=mime-version:date:message-id:subject:from:to:content-type
         :x-gm-message-state;
        bh=XCMA4JpWSqXxHRfKIpZw8OgSOgywOjR09TiW8uBlQOA=;
        b=VUqfw0ubkIrUgJwqVf56XWE4em6v/rHfun8mOOcUOXK/vjOdeaJfwY9j9102TcAAd2
         2NtFCQZJq3MGt3+2V4fjIu6hh/wqH8d1Z2CliQFu81ywQFhVkY2PbTw9gdCUr/Ly0YJ4
         Bk9RhvKOZjLiIpsoNVZta2Rqiw/uVgO2HWN9XjBpSa7jivqBmUcj3E/MvKzVinQdTL8t
         YfGBlvXoVMyIa0KjSnGx6jNvLYyodhQDdhR1EIlp2zQSGbHAyn8T8qShywiJc6I7rIVk
         0hlMayfkbJ2t8EIg5bmOtFrehAvOX9/yWCxR8dCoUAHP69xm2MB7BozE4pKWuJ93p8v7
         SQfQ==
X-Gm-Message-State: ALoCoQlP89jfQn+net5TblsOVPGBKLo+BhkY3UYXdx3PnYAtNiYRxHFQONPWUm0DncMp5V2WsEYs
Xref: news.gmane.org gmane.linux.lib.musl.general:2307
Archived-At: <http://permalink.gmane.org/gmane.linux.lib.musl.general/2307>

Why is the padding for sysinfo for the kernel different from the libc
one for Musl?

/usr/include/linux/kernel.h has 	char
_f[20-2*sizeof(long)-sizeof(int)];	/* Padding: libc5 uses this.. */
/usr/include/sys/sysinfo.h has       char __reserved[256];

glibc just includes the kernel header from sys/sysinfo.h so both these
structs are the same size there, so not sure I see any rationale.

Justin