I can't seem to get rid of these errors:

  GEN     .version
  CHK     include/generated/compile.h
  UPD     include/generated/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
drivers/built-in.o: In function `fec_enet_init':
bufp.c:(.text.unlikely+0x209c): undefined reference to `dma_alloc_noncacheable'
sound/built-in.o: In function `imx_pcm_preallocate_dma_buffer.constprop.8':
last.c:(.text+0x37320): undefined reference to `dma_alloc_writethrough'
last.c:(.text+0x37370): undefined reference to `dma_alloc_writethrough'
sound/built-in.o: In function `imx_soc_platform_probe':
last.c:(.devinit.text+0x528): undefined reference to `dma_alloc_noncacheable'
make: *** [.tmp_vmlinux1] Error 1

Does anyone have any ideas which files need to #include the dma headers?

Note that bufp.c is symlinked out of the kernel tree into the xenomai
tree. (by the xeno patch) and does not contain a fec_enet_init
function, nor a call to dma_alloc_noncacheable.
fec_enet_init exists in drivers/net/fec.c and does have a call to
dma_alloc_noncacheable, but also #includes dma-mapping.h. (though
dma_alloc_noncacheable is actually in
arch/arm/include/asm/dma-mapping.h which is conditionally #included in
<linux/dma-mapping.h>

Is it possible that something like changing the sequence of the
includes is required?
Maybe the flags don't always get reset so

#ifndef ASMARM_DMA_MAPPING_H
#define ASMARM_DMA_MAPPING_H

Is non-including the required functions?

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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