From: Ian Campbell <ijc@hellion.org.uk>
To: Brian Gerst <brgerst@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
       Andrew Morton <akpm@linux-foundation.org>
In-Reply-To: <73c1f2161001161618l7b471f48ldb4c33c88eafb7b6@mail.gmail.com>
References: <20100116170338.GA17175@elte.hu>
	 <alpine.LFD.2.00.1001161233300.13231@localhost.localdomain>
	 <73c1f2161001161618l7b471f48ldb4c33c88eafb7b6@mail.gmail.com>
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Date: Sun, 17 Jan 2010 06:00:23 +0000
Message-ID: <1263708023.14137.1213.camel@localhost.localdomain>
Mime-Version: 1.0
Subject: Re: [GIT PULL] x86 fixes
Sender: linux-kernel-owner@vger.kernel.org
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On Sat, 2010-01-16 at 19:18 -0500, Brian Gerst wrote:=20
> On Sat, Jan 16, 2010 at 3:34 PM, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
> >
> >
> > On Sat, 16 Jan 2010, Ingo Molnar wrote:
> >>
> >> Cyrill Gorcunov (1):
> >>       x86: kernel_thread() -- initialize SS to a known state
> >
> > This looks bogus. Why does it do it only on x86-64?
> >
> > Either people care about SS or they don't (the answer, I suspect, is "t=
hey
> > don't"). But if they care, we should do it on both 32-bit _and_ 64-bit,
> > no?
>=20
> 32-bit doesn't care about ss or esp since it won't pop them from the
> stack when returning to the same privilege level.

Right! That's the bit of behaviour I wasn't thinking of.

Thanks, Ian.

--=20
Ian Campbell

Under every stone lurks a politician.
		-- Aristophanes

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