linux-kernel - Re: [PATCH] remove csum_partial_copy_generic

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Date:	Tue, 17 Jun 2014 21:45:01 +0800
From:	Real Name <enjoymindful@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	user-mode-linux-devel@...ts.sourceforge.net,
	user-mode-linux-user@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, jdike@...toit.com
Subject: Re: [PATCH] remove csum_partial_copy_generic_i386 to clean up
 exception table

On Mon, Jun 09, 2014 at 01:45:56PM +0800, Real Name wrote:
> On Thu, Jun 05, 2014 at 11:49:49PM +0200, Richard Weinberger wrote:
> > Am 05.06.2014 06:15, schrieb Honggang Li:
> > > arch/x86/um/checksum_32.S had been copy & paste from x86. When build
> > > x86 uml, csum_partial_copy_generic_i386 mess up the exception table.
> > > In fact, exception table dose not work in uml kernel.
> > 
> > Are you sure that exception tables do not work on UML?
> > I said, I'm not sure. Can you please find out?
> 
> I think we can't test the exception table with linux-next uml kernel, because
> the exception table is broken.
>

This patch is the root source of the broken exception table of UML
kernel. 

linux]# git bisect visualize 
commit 706276543b699d80f546e45f8b12574e7b18d952
Author: H. Peter Anvin <hpa@...or.com>
Date:   Fri Apr 20 17:12:48 2012 -0700

    x86, extable: Switch to relative exception table entries
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