linux-kernel - Re: [PATCH v2] x86: Remove compat vdso support

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Date:	Wed, 12 Mar 2014 14:37:47 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stefani Seibold <stefani@...bold.net>
CC:	Andy Lutomirski <luto@...capital.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Dave Jones <davej@...hat.com>,
	Martin Runge <Martin.Runge@...de-schwarz.com>,
	Andreas Brief <Andreas.Brief@...de-schwarz.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2] x86: Remove compat vdso support

On 03/12/2014 12:41 PM, Linus Torvalds wrote:
> 
> So my reaction was "don't do that".
> 
> But people pointing out that we can't do what x86-64 does made me
> think: we could avoid the whole "nasty code for a legacy case" by
> making it the *non*-legacy case. We could get rid of the fixmap
> HPET/VVAR entirely - on x86-64 (which can use those addresses) a
> PC-relative addressing is probably actually better anyway, so mapping
> them together with the vdso code shouldn't hurt.
> 

How would that deal with the legacy vsyscall case for x86-64?  Just rely
on the "legacy vsyscall emulation" (which seems to have its own class of
problems...)?

	-hpa


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