$ for i in `grep -r "__setup(" * | sed 's/.*__setup("\([^="]*\).*/\1/' | grep -v "/"`; do grep -q $i Documentation/kernel-parameters.txt; [ $? -ne 0 ] && echo $i; done | sort
acpi_wake_gpes_always_on
adb_sync
agp
all-generic-ide
aoe_iflist
apicmaintimer
apicpmtimer
asidmask
au1550_audio
audit
calgary
celleb_machine_type_hack
config7
debug-alternative
decay
disable_cpe_poll
dyntick
etrax100_eth
fakehd
fake_ide
fas216_logging
fbcon
five_v_on
force_cpei
force_ep80219
fpaff
fpe
fpe
hangtrig
hcheck_dump_tasks
hcheck_margin
hcheck_reboot
hcheck_tick
hugepagesz
hvc_beat
iommu
iommu
iop13xx_init_atu
iop13xx_init_i2c
iop13xx_init_uart
iop3xx_init_atu
ipibufs
itcbase
ixdp2x01_clock
lcd
ledoff
max_cache_size
maxtcs
maxvpes
mconsole
mpurate
MTD_Partion
nblsu
ndflush
niflush
noapicmaintimer
noapictimer
nodsp
noexec32
nofpu
nohpet
no_ipi_broadcast
noirqdistrib
nojitter
nokgdb
nokgdb
nolwsys
nopfault
nopmtimer
norps
nostlb
nowait
ntlb
of_debug
of_debug
ofpci_debug
pagefaulttrace
pci_slot_ignore
powersave
ppchameleonevb_fio_pbase
ppchameleon_fio_pbase
protdflush
protect4gb
protiflush
qla1280
ramdisk_start
raw_show_trace
rdhwr_noopt
riohdid
rpsctl
rtasmsgs
savemaxmem
sbapagesize
sf16fmr2
smp-alt-boot
smt-snooze-delay
spin_retry
spread_lpevents
ssl
stderr
surveillance
tft
tintq
txx9_serial
ubd
udb
user_debug
vrc4171_card
vrc4173_cardu
waitdbg