I started getting following linking error on amd64 after the 2.6.25
patch floodgates were opened:
[snip]
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
arch/x86/vdso/built-in.o: In function `init_vdso_vars':
vma.c:(.init.text+0x170): undefined reference to `VDSO64_vgetcpu_mode'
vma.c:(.init.text+0x1a3): undefined reference to `VDSO64_vsyscall_gtod_data'
vma.c:(.init.text+0x1aa): undefined reference to `VDSO64_vgetcpu_mode'
vma.c:(.init.text+0x1d8): undefined reference to `VDSO64_vsyscall_gtod_data'
make: *** [.tmp_vmlinux1] Error 1

Bisecting turned up following commit:
2b9c97e16101e8dc2b0810d6f932d475a051d785 is first bad commit
commit 2b9c97e16101e8dc2b0810d6f932d475a051d785
Author: Roland McGrath <roland@redhat.com>
Date:   Wed Jan 30 13:30:41 2008 +0100

    x86 vDSO: remove vdso-syms.o
    
    Get rid of vdso-syms.o from the kernel link.  We don't need it any more.
    
    Signed-off-by: Roland McGrath <roland@redhat.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>


To test get the error, just disable 32 bit emulation (IA32_EMULATION)

Cheers,
Priit ;)
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