Observed the following build error:
---
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
  GEN     .version
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
drivers/built-in.o:(.data.rel+0x7840): undefined reference to
`snd_pcm_lib_ioctl'
drivers/built-in.o:(.toc1+0xe080): undefined reference to
`snd_pcm_link_rwlock'
make: *** [.tmp_vmlinux1] Error 1
---

I reported this earlier on 2009-04-08:
http://article.gmane.org/gmane.linux.kernel/819156

Regards--
Subrata