WSL2-Linux-Kernel/Documentation
David Howells 76d8aeabfe [PATCH] keys: Discard key spinlock and use RCU for key payload
The attached patch changes the key implementation in a number of ways:

 (1) It removes the spinlock from the key structure.

 (2) The key flags are now accessed using atomic bitops instead of
     write-locking the key spinlock and using C bitwise operators.

     The three instantiation flags are dealt with with the construction
     semaphore held during the request_key/instantiate/negate sequence, thus
     rendering the spinlock superfluous.

     The key flags are also now bit numbers not bit masks.

 (3) The key payload is now accessed using RCU. This permits the recursive
     keyring search algorithm to be simplified greatly since no locks need be
     taken other than the usual RCU preemption disablement. Searching now does
     not require any locks or semaphores to be held; merely that the starting
     keyring be pinned.

 (4) The keyring payload now includes an RCU head so that it can be disposed
     of by call_rcu(). This requires that the payload be copied on unlink to
     prevent introducing races in copy-down vs search-up.

 (5) The user key payload is now a structure with the data following it. It
     includes an RCU head like the keyring payload and for the same reason. It
     also contains a data length because the data length in the key may be
     changed on another CPU whilst an RCU protected read is in progress on the
     payload. This would then see the supposed RCU payload and the on-key data
     length getting out of sync.

     I'm tempted to drop the key's datalen entirely, except that it's used in
     conjunction with quota management and so is a little tricky to get rid
     of.

 (6) Update the keys documentation.

Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-24 00:05:18 -07:00
..
DocBook [PATCH] fix "make mandocs" after class_simple.c removal 2005-06-20 15:15:12 -07:00
RCU [PATCH] Update RCU documentation 2005-05-01 08:59:05 -07:00
aoe [PATCH] aoe: update the documentation to mention aoetools 2005-05-03 23:34:54 -07:00
arm Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
block Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cdrom Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpu-freq [PATCH] cpufreq-stats driver documentation 2005-05-31 19:04:05 -07:00
cris Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
crypto Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
device-mapper Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
driver-model [PATCH] Driver Core: driver model doc update 2005-06-20 15:15:29 -07:00
dvb [PATCH] dvb: bt8xx: updated documentation 2005-05-17 07:59:34 -07:00
early-userspace Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fb [PATCH] intelfb documentation 2005-06-21 19:07:40 -07:00
filesystems [PATCH] isofs: show hidden files, add granularity for assoc/hidden files flags 2005-06-21 19:07:38 -07:00
firmware_class Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fujitsu/frv Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
i2c [PATCH] I2C: w83781d: remove non-i2c sensor chips 2005-06-21 21:52:07 -07:00
i2o Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
i386 [PATCH] Increase number of e820 entries hard limit from 32 to 128 2005-05-01 08:58:51 -07:00
ia64 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
infiniband [PATCH] IPoIB: document conversion to debugfs 2005-04-16 15:26:07 -07:00
input Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioctl Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
isdn Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kbuild Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
m68k Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mips Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
networking [TCP]: Update sysctl and congestion control documentation. 2005-06-23 12:22:36 -07:00
parisc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
power [PATCH] Driver Core: remove driver model detach_state 2005-05-17 14:54:55 -07:00
powerpc [PATCH] Driver Core: remove driver model detach_state 2005-05-17 14:54:55 -07:00
s390 [PATCH] s390: cio documentation 2005-06-21 19:07:33 -07:00
scsi [SCSI] allow sleeping in ->eh_host_reset_handler() 2005-06-17 12:05:18 -05:00
serial Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sh Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sound [ALSA] hda-codec - More fix of ALC880 codec support 2005-06-22 12:28:59 +02:00
sparc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sysctl [PATCH] setuid core dump 2005-06-23 09:45:26 -07:00
telephony Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
uml Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
usb Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
video4linux Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vm Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
w1 [PATCH] w1: Updates the w1 documentation (w1.generic) 2005-06-21 21:43:12 -07:00
watchdog Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
x86_64 [PATCH] x86_64: Add option to disable timer check 2005-05-20 15:48:21 -07:00
00-INDEX [PATCH] remove BK documentation 2005-05-05 16:36:42 -07:00
BUG-HUNTING Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Changes [PATCH] DocBook: Use xmlto to process the DocBook files. 2005-05-01 08:59:27 -07:00
CodingStyle Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
DMA-API.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
DMA-mapping.txt [PATCH] remove old scsi data direction macros 2005-04-18 13:49:58 -05:00
IO-mapping.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
IPMI.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
IRQ-affinity.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
MSI-HOWTO.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ManagementStyle Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
PCIEBUS-HOWTO.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
README.DAC960 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
README.cycladesZ Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SAK.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SecurityBugs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SubmittingDrivers Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SubmittingPatches Update DCO ("signoff") rules to 1.1 2005-06-13 17:51:55 -07:00
VGA-softcursor.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
atomic_ops.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
basic_profiling.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
binfmt_misc.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cachetlb.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cciss.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cli-sti-removal.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
computone.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpqarray.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpusets.txt [PATCH] cpusets+hotplug+preepmt broken 2005-05-20 15:48:19 -07:00
debugging-modules.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
devices.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
digiepca.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dnotify.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dontdiff [PATCH] Add offset.h to dontdiff 2005-06-23 09:45:31 -07:00
eisa.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exception.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
feature-removal-schedule.txt [PATCH] Add removal schedule of register_serial/unregister_serial to appropriate file 2005-06-23 10:04:15 -07:00
floppy.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ftape.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hayes-esp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
highuid.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hpet.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hw_random.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ibm-acpi.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ide.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
initrd.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
io_ordering.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioctl-number.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
iostats.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
isapnp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
java.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kernel-doc-nano-HOWTO.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kernel-docs.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kernel-parameters.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
keys.txt [PATCH] keys: Discard key spinlock and use RCU for key payload 2005-06-24 00:05:18 -07:00
kobject.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kref.txt [PATCH] kref: add link to original documentation to the kref documentation. 2005-04-18 21:57:30 -07:00
laptop-mode.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ldm.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
locks.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
logo.gif Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
logo.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
magic-number.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mandatory.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mca.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
md.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
memory.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mono.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
moxa-smartio Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mtrr.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nbd.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nfsroot.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nmi_watchdog.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nommu-mmap.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
numastat.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
oops-tracing.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
paride.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
parport-lowlevel.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
parport.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci.txt [PATCH] PCI: update PCI documentation for pci_get_slot() depreciation 2005-05-03 23:45:14 -07:00
pm.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pnp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
preempt-locking.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
prio_tree.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ramdisk.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
riscom8.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rocket.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rpc-cache.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rtc.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sched-coding.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sched-design.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sched-domains.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sched-stats.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
seclvl.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
serial-console.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sgi-ioc4.txt [PATCH] ioc4: Core driver rewrite 2005-06-21 18:46:32 -07:00
sgi-visws.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
smart-config.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
smp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sonypi.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sparse.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
specialix.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
spinlocks.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
stable_api_nonsense.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
stallion.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
svga.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sx.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sysrq.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
time_interpolators.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tipar.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tty.txt [PATCH] Introduce tty_unregister_ldisc() 2005-06-23 09:45:35 -07:00
unicode.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
voyager.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
xterm-linux.xpm Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
zorro.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00

README.cycladesZ

The Cyclades-Z must have firmware loaded onto the card before it will
operate.  This operation should be performed during system startup,

The firmware, loader program and the latest device driver code are
available from Cyclades at
    ftp://ftp.cyclades.com/pub/cyclades/cyclades-z/linux/