linux-kernel - Re: Build regressions/improvements in v3.4-rc7

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Message-ID: <BLU0-SMTP3215D3E80BA82F3C6A654197190@phx.gbl>
Date:	Wed, 16 May 2012 20:27:35 -0400
From:	John David Anglin <dave.anglin@...l.net>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org,
	Linuxppc-dev <linuxppc-dev@...abs.org>,
	Parisc List <linux-parisc@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	James Morris <jmorris@...ei.org>
Subject: Re: Build regressions/improvements in v3.4-rc7

On 16-May-12, at 10:46 AM, James Bottomley wrote:

> Wow, lib/mpi/ is a complete horror: it's full of hand crafted asm  
> code.
> The error in this case appears to be that umul_ppm() is implemented as
> an xmpyu instruction.  That's a floating point instruction.  We
> deliberately compile the kernel with floating point disabled because  
> we
> don't want to save and restore the floating point register file on  
> each
> context switch, hence the operand constraints are unsatisfiable.

I haven't tried this but I think the parisc implementation of umul_ppmm
can be deleted.  There is a generic version in the file.

Dave
--
John David Anglin	dave.anglin@...l.net



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