由于版本变化导致wifi驱动insmod检测时出错退出，提示：
# insmod unifi_sdio.ko
unifi_sdio: version magic '2.6.27 mod_unload ARMv6 ' should be '2.6.27-svn53 mod_unload ARMv6 '
insmod: init_module 'unifi_sdio.ko' failed (Exec format error)
查找到"2.6.27-svn53"是在$(srctree)/inlucde/linux/utsrelease.h中定义的，按$(srctree)/Makefile中
kernelrelease = $(KERNELVERSION)$(localver-full)
KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
localver-full = $(localver)$(localver-auto)
ifdef CONFIG_LOCALVERSION_AUTO
_localver-auto = $(shell $(CONFIG_SHELL) /
$(srctree)/scripts/setlocalversion $(srctree))
localver-auto = $(LOCALVERSION)$(_localver-auto)
endif
再到$(srctree)/scripts/setlocalversion查找，看到有
# Check for svn and a svn repo.
if rev=`svn info 2>/dev/null | grep '^Revision'`; then
rev=`echo $rev | awk '{print $NF}'`
changes=`svn status 2>/dev/null | grep '^[AMD]' | wc -l`
# Are there uncommitted changes?
if [ $changes != 0 ]; then
printf -- '-svn%s%s%s' "$rev" -dirty "$changes"
else
printf -- '-svn%s' "$rev"
fi
# All done with svn
exit
fi
原来是这里！ 检测svn的版本信息，然后加入到_localver-auto，最终连接到kernelrelease。
注释掉这部分，编译后就可以正常加载了。