From: Andrea Arcangeli <andrea@suse.de>
To: Pavel Machek <pavel@suse.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>
Subject: Re: kernel_thread bogosity
Date: Mon, 27 Nov 2000 00:38:44 +0100 [thread overview]
Message-ID: <20001127003844.C23807@athlon.random> (raw)
In-Reply-To: <20001123232333.A6426@bug.ucw.cz> <20001124014830.I1461@athlon.random> <20001124205247.A141@bug.ucw.cz> <20001126172658.A5636@athlon.random> <20001126232932.A4052@bug.ucw.cz>
In-Reply-To: <20001126232932.A4052@bug.ucw.cz>; from pavel@suse.cz on Sun, Nov 26, 2000 at 11:29:32PM +0100
On Sun, Nov 26, 2000 at 11:29:32PM +0100, Pavel Machek wrote:
> Is this different on x86-64 in long mode?
Yes, in 64bit mode ss:rsp is restore unconditionally. In compatibility and
legacy modes it's restored only if the CPL changes.
kernel never runs in compatibility mode (and userspace never runs iret) so in
kernel_thread we know x86-64 always restores ss:rsp from the stack.
You should find this as a familiar behaviour as you just tried to pass a stack
via kernel_thread in your latest patch against cvs :).
Andrea
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prev parent reply other threads:[~2000-11-27 0:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-23 22:23 kernel_thread bogosity Pavel Machek
2000-11-24 0:48 ` Andrea Arcangeli
2000-11-24 19:52 ` Pavel Machek
2000-11-26 16:26 ` Andrea Arcangeli
2000-11-26 22:29 ` Pavel Machek
2000-11-26 23:38 ` Andrea Arcangeli [this message]
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