Sample of my kernel's mostly useless symbols
(starting_with:# of symbols):

__func__: 624
__vendorstr_: 1760
__pci_fixup_PCI_: 116
__ksymtab_: 2597
__kstrtab_: 2597
__kcrctab_: 2597
__initcall_: 236
__devicestr_: 4686
__devices_: 1760
Total: 16973
Lines in System.map: 39735

Excluding them from in-kernel symbol table saves ~300kb:

   text    data     bss     dec     hex filename
4337710 1054414  259296 5651420  563bdc vmlinux.carrier1 - w/o KALLSYMS
4342068 1296046  259296 5897410  59fcc2 vmlinux - with KALLSYMS+patch
4341948 1607634  259296 6208878  5ebd6e vmlinux.carrier - with KALLSYMS
        ^^^^^^^
--
vda