On Tue, 4 Mar 2008 09:02:20 +0000 Ralf Baechle <ralf@xxxxxxxxxxxxxx> 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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