linux-kernel - Re: [PATCH] remove csum_partial_copy_generic

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Date:	Thu, 05 Jun 2014 23:49:49 +0200
From:	Richard Weinberger <richard@....at>
To:	Honggang Li <enjoymindful@...il.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	user-mode-linux-user@...ts.sourceforge.net
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remove csum_partial_copy_generic_i386 to clean up exception
 table

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?

In arch/um/kernel/trap.c:segv() we have the mechanism for it:
        else if (!is_user && arch_fixup(ip, regs))
                goto out;

The interesting question is, is this by design or was it just copy&pasted from x86
many moons ago? :)

> And csum_partial_copy_generic_i386 never been called. So, delete it.

I like such clean ups. :-)

Thanks,
//richard
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