linux-kernel - Re: [PATCH v5 8/9] x86-64: Emulate legacy vsyscalls

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Message-ID: <20110606073901.GA27075@elte.hu>
Date:	Mon, 6 Jun 2011 09:39:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Lutomirski <luto@....edu>
Cc:	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Jesper Juhl <jj@...osbits.net>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Beulich <JBeulich@...ell.com>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Andi Kleen <andi@...stfloor.org>,
	Brian Gerst <brgerst@...il.com>,
	Louis Rilling <Louis.Rilling@...labs.com>,
	Valdis.Kletnieks@...edu, pageexec@...email.hu
Subject: Re: [PATCH v5 8/9] x86-64: Emulate legacy vsyscalls


* Andrew Lutomirski <luto@....edu> wrote:

> > We could even 'tie down' the actual assembly by moving this all 
> > to a .S - this way we protect against GCC accidentally generating 
> > something dangerous in there. I suggested that before.
> 
> I have no problem with that suggestion, except that once the 
> current series makes it into -tip I intend to move vread_tsc and 
> vread_hpet to the vDSO.  So leaving them alone for now saves work, 
> and they'll be more maintainable later if they're written in C.

Sure, if they move to the vDSO real soon then moving them to assembly 
becomes moot.

Thanks,

	Ingo
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