linux-kernel - Re: 2.6.20-rc7: known regressions

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Message-ID: <m1k5yxx7yz.fsf@ebiederm.dsl.xmission.com>
Date:	Mon, 05 Feb 2007 02:35:32 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andi Kleen <ak@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frédéric Riss 
	<frederic.riss@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Domsch <Matt_Domsch@...l.com>,
	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Neil Brown <neilb@...e.de>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeff Garzik <jeff@...zik.org>,
	Francois Romieu <romieu@...zoreil.com>
Subject: Re: 2.6.20-rc7: known regressions

Andi Kleen <ak@...e.de> writes:

> On Sunday 04 February 2007 18:34, Linus Torvalds wrote:
>> 
>> On Sun, 4 Feb 2007, Frédéric Riss wrote:
>> > 
>> > New patch:
>> 
>> I didn't get how this would fix the ia64 issues? I thought ia64 needed 
>> the standard calling convention?
>
> asmlinkage is standard enough on ia64 as far as I can see.
>
> It defines to an undocumented attribute that seems to only affect the
> generated code for functions (basically it forces the compiler
> to not reuse input arguments, similar to prevent_tail_call() on i386), 
> not for pointers.

Regardless.  If we are serious about supporting EFI instead of just
nursing it along for the rare person stuck with it, we are going
to need to remove the brain-dead relocate exactly once to virtual addresses
call, so we can use kexec.

Therefore we will need a trampoline to switch to physical mode.

Of course that presumes the Open (but no one is allowed to read or implement
the standard, or join the committee ) EFI is sufficiently interesting at
some point to bother supporting properly.

Eric
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