linux-kernel - Re: [RFC 0/2] __vdso

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Message-ID: <20140616034904.GU179@brightrain.aerifal.cx>
Date:	Sun, 15 Jun 2014 23:49:04 -0400
From:	Rich Felker <dalias@...c.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Mikael Pettersson <mikpelinux@...il.com>,
	Russ Cox <rsc@...ang.org>,
	Linux API <linux-api@...r.kernel.org>,
	Ian Taylor <iant@...ang.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>
Subject: Re: [RFC 0/2] __vdso_findsym

On Mon, Jun 16, 2014 at 04:36:04AM +0200, Andi Kleen wrote:
> 
> At least versioning is always useful to have, just to have 
> another tool for compatibility if changes are needed.

I disagree. Just like syscalls, vdso functions with new APIs/ABIs
should have new names. For example if a version of clock_gettime for a
new userspace with 64-bit time_t is added, it should be called
clock_gettime64 (with a corresponding __NR_clock_gettime64), not
offered as a versioned symbol over top of the old one. The versioned
symbol approach is a lot more confusing and as far as I can tell
offers no benefits.

Rich
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