Latest working kernel version:
Earliest failing kernel version: 2.6.26-rc1
Distribution: 
Hardware Environment:
Software Environment:

gcc -v:

Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c                                                              ++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/l                                                              ib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-inc                                                              lude-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enabl                                                              e-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-c                                                              hecking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux                                                              -gnu
Thread model: posix
gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)


Problem Description:
Build failure with Linux 2.6.26-rc1

Steps to reproduce:

1. git pull git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

I used make xconfig in order to set kernel options.
You can see .config as an attachment.

Kernel build process failed with these error messages:

LD      vmlinux.o
  MODPOST vmlinux.o
WARNING: modpost: Found 2 section mismatch(es).
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: In function `xc2028_get_reg':
tuner-xc2028.c:(.text+0xbe9f3): undefined reference to `i2c_transfer'
drivers/built-in.o: In function `load_firmware':
tuner-xc2028.c:(.text+0xbf686): undefined reference to `i2c_transfer'
drivers/built-in.o: In function `generic_set_freq':
tuner-xc2028.c:(.text+0xc0208): undefined reference to `i2c_transfer'
tuner-xc2028.c:(.text+0xc028b): undefined reference to `i2c_transfer'
tuner-xc2028.c:(.text+0xc030a): undefined reference to `i2c_transfer'
drivers/built-in.o:tuner-xc2028.c:(.text+0xc05e9): more undefined references to `i2c_transfer' follow
drivers/built-in.o: In function `simple_set_params':
tuner-simple.c:(.text+0xc2432): undefined reference to `i2c_clients_command'
tuner-simple.c:(.text+0xc245f): undefined reference to `i2c_transfer'
tuner-simple.c:(.text+0xc2574): undefined reference to `i2c_clients_command'
tuner-simple.c:(.text+0xc261d): undefined reference to `i2c_transfer'
tuner-simple.c:(.text+0xc27e2): undefined reference to `i2c_transfer'
tuner-simple.c:(.text+0xc28a5): undefined reference to `i2c_transfer'
tuner-simple.c:(.text+0xc2992): undefined reference to `i2c_transfer'
tuner-simple.c:(.text+0xc2bcc): undefined reference to `i2c_transfer'
drivers/built-in.o:tuner-simple.c:(.text+0xc2c3a): more undefined references to `i2c_transfer' follow
drivers/built-in.o: In function `v4l2_i2c_drv_detach_legacy':
tuner-core.c:(.text+0xd1d7e): undefined reference to `i2c_detach_client'
drivers/built-in.o: In function `v4l2_i2c_drv_probe_legacy':
tuner-core.c:(.text+0xd1dd8): undefined reference to `i2c_probe'
drivers/built-in.o: In function `v4l2_i2c_drv_attach_legacy':
tuner-core.c:(.text+0xd1dfd): undefined reference to `v4l2_i2c_attach'
drivers/built-in.o: In function `set_type':
tuner-core.c:(.text+0xd30b3): undefined reference to `i2c_master_send'
tuner-core.c:(.text+0xd30d4): undefined reference to `i2c_master_send'
tuner-core.c:(.text+0xd314f): undefined reference to `i2c_master_send'
drivers/built-in.o: In function `tuner_probe':
tuner-core.c:(.text+0xd395e): undefined reference to `i2c_master_recv'
drivers/built-in.o: In function `v4l2_i2c_drv_init':
tuner-core.c:(.init.text+0x7097): undefined reference to `i2c_register_driver'
tuner-core.c:(.init.text+0x70e0): undefined reference to `i2c_register_driver'
tuner-core.c:(.init.text+0x70f0): undefined reference to `i2c_del_driver'
drivers/built-in.o: In function `v4l2_i2c_drv_cleanup':
tuner-core.c:(.exit.text+0x7a9): undefined reference to `i2c_del_driver'
tuner-core.c:(.exit.text+0x7b3): undefined reference to `i2c_del_driver'
make: *** [.tmp_vmlinux1] Error 1

Next, I did:

make CONFIG_DEBUG_SECTION_MISMATCH=y

Here are section mismatch reports:

  CC      arch/x86/kernel/k8.o
  LD      arch/x86/kernel/built-in.o
WARNING: arch/x86/kernel/built-in.o(.text+0x140b1): Section mismatch in reference from the function cpu_exit_clear() to the function .cpuinit.text:cpu_uninit()
The function cpu_exit_clear() references
the function __cpuinit cpu_uninit().
This is often because cpu_exit_clear lacks a __cpuinit
annotation or the annotation of cpu_uninit is wrong.

  LD      vmlinux.o
  MODPOST vmlinux.o
WARNING: vmlinux.o(.text+0x153c1): Section mismatch in reference from the function cpu_exit_clear() to the function .cpuinit.text:cpu_uninit()
The function cpu_exit_clear() references
the function __cpuinit cpu_uninit().
This is often because cpu_exit_clear lacks a __cpuinit
annotation or the annotation of cpu_uninit is wrong.

WARNING: vmlinux.o(.text+0x371689): Section mismatch in reference from the function pci_scan_bus_on_node() to the function .devinit.text:pci_scan_bus_parented()
The function pci_scan_bus_on_node() references
the function __devinit pci_scan_bus_parented().
This is often because pci_scan_bus_on_node lacks a __devinit
annotation or the annotation of pci_scan_bus_parented is wrong.