linux-kernel - Re: drivers/net/wireless/b43legacy/ on mips

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Date:	Tue, 4 Mar 2008 01:19:05 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org
Subject: Re: drivers/net/wireless/b43legacy/ on mips

On Tue, 4 Mar 2008 09:02:20 +0000 Ralf Baechle <ralf@...ux-mips.org> wrote:

> On Mon, Mar 03, 2008 at 11:36:51PM -0800, Andrew Morton wrote:
> 
> > ERROR: "__ucmpdi2" [drivers/net/wireless/b43legacy/b43legacy.ko] undefined!
> > ERROR: "__ucmpdi2" [drivers/net/wireless/b43/b43.ko] undefined!
> > 
> > int b43legacy_dma_init(struct b43legacy_wldev *dev)
> > {
> >         struct b43legacy_dma *dma = &dev->dma;
> >         struct b43legacy_dmaring *ring;
> >         int err;
> >         u64 dmamask;
> >         enum b43legacy_dmatype type;
> > 
> >         dmamask = supported_dma_mask(dev);
> >         switch (dmamask) {
> >         default:
> >                 B43legacy_WARN_ON(1);
> >         case DMA_30BIT_MASK:
> >                 type = B43legacy_DMA_30BIT;
> >                 break;
> >         case DMA_32BIT_MASK:
> >                 type = B43legacy_DMA_32BIT;
> >                 break;
> >         case DMA_64BIT_MASK:
> >                 type = B43legacy_DMA_64BIT;
> >                 break;
> >         }
> > 
> > because some versions of gcc emit a __ucmpdi2 call for switch statements. 
> 
> Was this when optimizing for size btw?

mips allmodconfig.  So: yes.

>  It seems gcc is emitting alot more
> calls to libgcc when optimizing for size.
> 
> > It might be fixable by switching to an open-coded if/compare/else sequence.
> 
> It was just a EXPORT_SYMBOL(__ucmpdi2) missing.

doh.

> > Or maybe my mips compiler (gcc-3.4.5) is just too old..
> 
> I'm trying to keep the tools requirements the same as for x86.  So for
> 32-bit kernels gcc 3.2 is the minimum but 3.2 is broken beyond recovery
> for 64-bit code so there a minimum of 3.3 is required.
> 
> In practive it is ages that I've last seen a compiler older than gcc 3.4
> being used to build a modern kernel for any architecture and 3.2 and 3.3
> are a sufficient special case that maybe we should think about deprecating
> 3.2 and 3.3?

That would make life easier for us.  I don't know what the downstream
implications would be.  I'd need a new cross-compiler, for a start ;)

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