linux-kernel - Re: [GIT PULL] x86: unify sys

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Message-ID: <4AD4B0A0.6050200@goop.org>
Date:	Tue, 13 Oct 2009 09:53:52 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] x86: unify sys_iopl

On 10/13/09 09:24, H. Peter Anvin wrote:
> First of all, the unification looks good.
>
> As far as .32 is concerned... this *is* a bug even if this is only for
> paravirt, and given the small amount of code I am personally OK with
> taking the whole patch for .32.
>
> However, the patch is not complete!  The patch incidentally eliminates
> the need to have assembly stubs for sys_iopl, and those assembly stubs
> should be removed.  I have a patch for that currently test building.
>   

I wasn't sure whether task_pt_regs() needed the full register set to be
saved to correctly return rflags (that is, does PTREGSCALL change the
shape of the stack, or just the contents?).

    J
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