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Andrew Morton 498d0c5711 [PATCH] set_current_state() commentary 
Explain the mysteries of set_current_state().

Quoth Linus:

 The scheduler itself never needs the memory barrier at all.

 The barrier is needed only if the user itself ends up testing some other
 thing afterwards, ie if you have

 	set_process_state(TASK_INTERRUPTIBLE);
 	if (still_need_to_sleep())
 		schedule();

 then the "still_need_to_sleep()" thing may test flags and wakeup events,
 and then you _may_ want to (and often do) make sure that the write of
 TASK_INTERRUPTIBLE is serialized wrt the reads of any wakeup data (since
 the wakeup may have happened on another CPU).

 So the comment is somewhat wrong. We don't really _care_ whether the state
 propagates out to other CPU's since all of our actions are purely local,
 and there is nothing we do that is conditional on any other CPU: we're
 going to sleep unconditionally, and the scheduler only cares about _our_
 state, not about somebody elses state.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-13 08:22:29 -07:00
..
byteorder
dvb
hdlc
isdn
lockd
mmc
mtd
netfilter
netfilter_arp
netfilter_bridge
netfilter_ipv4
netfilter_ipv6
nfsd
raid [PATCH] md: add write-intent-bitmap support to raid5 2005-09-09 16:39:12 -07:00
sunrpc
tc_act
tc_ematch
8250_pci.h
a.out.h
ac97_codec.h
acct.h
acpi.h
adb.h
adfs_fs.h
adfs_fs_i.h
adfs_fs_sb.h
affs_fs.h
affs_hardblocks.h
agp_backend.h
agpgart.h
aio.h
aio_abi.h
amifd.h
amifdreg.h
amigaffs.h
apm_bios.h
arcdevice.h
arcfb.h
ata.h
atalk.h
atm.h
atm_eni.h
atm_he.h
atm_idt77105.h
atm_nicstar.h
atm_suni.h
atm_tcp.h
atm_zatm.h
atmapi.h
atmarp.h
atmbr2684.h
atmclip.h
atmdev.h
atmioc.h
atmlec.h
atmmpc.h
atmppp.h
atmsap.h
atmsvc.h
attribute_container.h
audit.h
auto_fs.h
auto_fs4.h
auxvec.h
awe_voice.h
ax25.h
b1lli.h
b1pcmcia.h
backing-dev.h
backlight.h
baycom.h
bcd.h
bfs_fs.h [PATCH] bfs: fix endianness, signedness; add trivial bugfix 2005-09-09 13:57:32 -07:00
binfmts.h
bio.h [PATCH] include/linux/bio.h: "extern inline" -> "static inline" 2005-09-10 10:06:35 -07:00
bit_spinlock.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
bitmap.h
bitops.h
blkdev.h [PATCH] include/linux/blkdev.h: "extern inline" -> "static inline" 2005-09-10 10:06:34 -07:00
blkpg.h
blockgroup_lock.h
bootmem.h
bpqether.h
buffer_head.h
cache.h
capability.h
capi.h
cciss_ioctl.h
cd1400.h
cdev.h
cdk.h
cdrom.h
chio.h [PATCH] __user annotations (scsi/ch) 2005-09-10 10:16:27 -07:00
circ_buf.h
cobalt-nvram.h
coda.h
coda_cache.h
coda_fs_i.h
coda_linux.h
coda_proc.h
coda_psdev.h
coff.h
com20020.h
compat.h
compat_ioctl.h
compiler-gcc.h
compiler-gcc2.h
compiler-gcc3.h
compiler-gcc4.h
compiler-intel.h
compiler.h
completion.h
comstats.h
concap.h
config.h
connector.h [NET]: Add netlink connector. 2005-09-11 19:15:07 -07:00
console.h
console_struct.h
consolemap.h
cpu.h
cpufreq.h
cpumask.h
cpuset.h
cramfs_fs.h
cramfs_fs_sb.h
crash_dump.h
crc-ccitt.h
crc16.h [PATCH] crc16: remove w1 specific comments. 2005-09-12 08:48:08 -07:00
crc32.h
crc32c.h
crypto.h
cryptohash.h
ctype.h
cuda.h
cyclades.h
cyclomx.h
cycx_cfm.h
cycx_drv.h
cycx_x25.h
dcache.h
dccp.h [DCCP] Introduce dccp_timestamp 2005-09-09 02:38:35 -03:00
dcookies.h
debugfs.h
delay.h
devfs_fs.h
devfs_fs_kernel.h
device-mapper.h
device.h
devpts_fs.h
dio.h
dirent.h
divert.h
dm-ioctl.h
dm9000.h
dma-mapping.h
dmapool.h [PATCH] dmapool: Fix "nocast type" warnings 2005-09-10 10:06:29 -07:00
dmi.h [PATCH] x86-64: Make dmi_find_device for !DMI case inline 2005-09-12 10:50:58 -07:00
dn.h
dnotify.h
dqblk_v1.h
dqblk_v2.h
dqblk_xfs.h
ds1286.h
dtlk.h
edd.h
eeprom.h
efi.h
efs_dir.h
efs_fs.h
efs_fs_i.h
efs_fs_sb.h
efs_vh.h
eisa.h
elevator.h
elf-fdpic.h
elf.h
elfcore.h
err.h
errno.h
errqueue.h
etherdevice.h
ethtool.h
eventpoll.h
ext2_fs.h
ext2_fs_sb.h
ext3_fs.h
ext3_fs_i.h
ext3_fs_sb.h
ext3_jbd.h
fadvise.h
fb.h [PATCH] fbcon: Break up bit_putcs into its component functions 2005-09-09 14:03:41 -07:00
fcdevice.h
fcntl.h
fd.h
fd1772.h
fddidevice.h
fdreg.h
file.h [PATCH] files: files struct with RCU 2005-09-09 13:57:55 -07:00
filter.h
firmware.h
flat.h
font.h
fs.h [PATCH] mm/filemap.c: make two functions static 2005-09-10 10:06:25 -07:00
fs_struct.h
fsl_devices.h
fsnotify.h
ftape-header-segment.h
ftape-vendors.h
ftape.h
fuse.h [PATCH] FUSE: add fsync operation for directories 2005-09-09 14:03:47 -07:00
futex.h
gameport.h
gen_stats.h
genalloc.h
generic_serial.h
genhd.h
gfp.h
hardirq.h
harrier_defs.h
hash.h
hayesesp.h
hdlc.h
hdlcdrv.h
hdpu_features.h
hdreg.h
hdsmart.h
hiddev.h
highmem.h
highuid.h
hippidevice.h
hpet.h
hpfs_fs.h
hugetlb.h
hwmon-sysfs.h
hwmon-vid.h
hwmon.h
hysdn_if.h
i2c-algo-bit.h
i2c-algo-ite.h
i2c-algo-pca.h
i2c-algo-pcf.h
i2c-algo-sgi.h
i2c-algo-sibyte.h
i2c-dev.h
i2c-id.h
i2c-isa.h
i2c-pxa.h
i2c.h
i2o-dev.h
i2o.h
i8k.h
ibmtr.h
icmp.h
icmpv6.h
ide.h
idr.h
if.h
if_arcnet.h
if_arp.h
if_bonding.h
if_bridge.h
if_cablemodem.h
if_ec.h
if_eql.h
if_ether.h
if_fc.h
if_fddi.h
if_frad.h
if_hippi.h
if_infiniband.h
if_ltalk.h
if_packet.h
if_plip.h
if_ppp.h
if_pppox.h
if_shaper.h
if_slip.h
if_strip.h
if_tr.h
if_tun.h
if_tunnel.h
if_vlan.h
if_wanpipe.h
if_wanpipe_common.h
igmp.h
in.h
in6.h [IPV6]: Note values allocated for ip6_tables. 2005-09-10 11:32:45 +09:00
in_route.h
inet.h
inet_diag.h
inetdevice.h
init.h
init_task.h [PATCH] files: files struct with RCU 2005-09-09 13:57:55 -07:00
initrd.h
inotify.h
input.h Manual merge with Linus 2005-09-09 20:14:47 -05:00
interrupt.h [PATCH] x86-64: Some cleanup and optimization to the processor data area. 2005-09-12 10:49:58 -07:00
ioc4.h
ioctl.h
ioctl32.h
ioport.h
ioprio.h
ip.h
ip6_tunnel.h
ip_mp_alg.h
ipc.h
ipmi.h
ipmi_msgdefs.h
ipmi_smi.h
ipsec.h
ipv6.h [IPV6]: Bring Type 0 routing header in-line with rfc3542. 2005-09-10 00:15:06 -07:00
ipv6_route.h
ipx.h
irda.h
irq.h
irq_cpustat.h
isapnp.h
isdn.h
isdn_divertif.h
isdn_ppp.h
isdnif.h
isicom.h
iso_fs.h
istallion.h
ite_gpio.h
ixjuser.h
jbd.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
jffs.h
jffs2.h
jffs2_fs_i.h
jffs2_fs_sb.h
jhash.h
jiffies.h [PATCH] include: update jiffies/{m,u}secs conversion functions 2005-09-10 10:06:36 -07:00
journal-head.h
joystick.h
kallsyms.h
kbd_diacr.h
kbd_kern.h
kd.h
kdev_t.h
kernel.h [PATCH] Make BUILD_BUG_ON fail at compile time. 2005-09-13 08:22:28 -07:00
kernel_stat.h
kernelcapi.h
kexec.h
key-ui.h
key.h
keyboard.h
keyctl.h
kfifo.h
klist.h
kmalloc_sizes.h
kmod.h
kobj_map.h
kobject.h
kobject_uevent.h
kprobes.h
kref.h
kthread.h
lapb.h
lcd.h
libata.h
libps2.h
limits.h
linkage.h
linux_logo.h
list.h
llc.h
loop.h
lp.h
major.h
matroxfb.h
mbcache.h
mc6821.h
mc146818rtc.h
mca-legacy.h
mca.h
mempolicy.h
mempool.h
meye.h
mii.h
minix_fs.h
miscdevice.h
mm.h
mm_inline.h
mman.h
mmtimer.h
mmzone.h
mod_devicetable.h
module.h
moduleloader.h
moduleparam.h
mount.h
mpage.h
mqueue.h
mroute.h
msdos_fs.h
msg.h
mtio.h
mv643xx.h
n_r3964.h
namei.h
namespace.h
nbd.h
ncp.h
ncp_fs.h
ncp_fs_i.h
ncp_fs_sb.h
ncp_mount.h
ncp_no.h
net.h
netdevice.h
netfilter.h
netfilter_arp.h
netfilter_bridge.h
netfilter_decnet.h
netfilter_ipv4.h
netfilter_ipv6.h
netfilter_logging.h
netlink.h [NET]: Add netlink connector. 2005-09-11 19:15:07 -07:00
netpoll.h
netrom.h
nfs.h
nfs2.h
nfs3.h
nfs4.h
nfs4_acl.h
nfs4_mount.h
nfs_fs.h
nfs_fs_i.h
nfs_fs_sb.h
nfs_idmap.h
nfs_mount.h
nfs_page.h
nfs_xdr.h
nfsacl.h
nfsd_idmap.h
nls.h
nmi.h
node.h
nodemask.h
notifier.h
nubus.h
numa.h
nvram.h
openprom_fs.h
oprofile.h
page-flags.h
pagemap.h
pagevec.h
param.h
parport.h
parport_pc.h
parser.h
patchkey.h
pci-acpi.h
pci.h Remove "must_check" attributes in PCI-land 2005-09-09 15:43:46 -07:00
pci_ids.h
pci_regs.h
pcieport_if.h
percpu.h
percpu_counter.h
personality.h
pfkeyv2.h
pg.h
phonedev.h
phy.h
pid.h
pipe_fs_i.h
pkt_cls.h
pkt_sched.h
pktcdvd.h
platform.h
pm.h
pmu.h
pnp.h
pnpbios.h
poll.h
posix-timers.h
posix_acl.h
posix_acl_xattr.h
posix_types.h
ppdev.h
ppp-comp.h
ppp_channel.h
ppp_defs.h
prctl.h
preempt.h
prefetch.h
prio_tree.h
proc_fs.h
profile.h
ps2esdi.h
ptrace.h
qic117.h
qnx4_fs.h
qnxtypes.h
quota.h
quotaio_v1.h
quotaio_v2.h
quotaops.h
radeonfb.h
radix-tree.h [PATCH] lib/radix-tree: Fix "nocast type" warnings 2005-09-10 10:06:28 -07:00
raid_class.h
ramfs.h
random.h
raw.h
rbtree.h
rcupdate.h [PATCH] files: fix rcu initializers 2005-09-09 13:57:54 -07:00
rcuref.h [PATCH] files: rcuref APIs 2005-09-09 13:57:54 -07:00
reboot.h
reboot_fixups.h
reiserfs_acl.h
reiserfs_fs.h [PATCH] "extern inline" -> "static inline" 2005-09-10 10:06:35 -07:00
reiserfs_fs_i.h
reiserfs_fs_sb.h
reiserfs_xattr.h
relayfs_fs.h
resource.h
rmap.h
romfs_fs.h
root_dev.h
rose.h
route.h
rslib.h
rtc.h
rtnetlink.h
rwsem-spinlock.h
rwsem.h
sc26198.h
scatterlist.h
scc.h
sched.h [PATCH] set_current_state() commentary 2005-09-13 08:22:29 -07:00
sctp.h
scx200.h
scx200_gpio.h
sdla.h
sdla_asy.h
sdla_chdlc.h
sdla_fr.h
sdla_ppp.h
sdla_x25.h
sdladrv.h
sdlapci.h
sdlasfm.h
seccomp.h
securebits.h
security.h [PATCH] remove the inode_post_link and inode_post_rename LSM hooks 2005-09-09 13:57:28 -07:00
selection.h
selinux_netlink.h
sem.h
seq_file.h
seqlock.h
serial.h
serial167.h
serial_8250.h
serial_core.h
serial_reg.h
serialP.h
serio.h
shm.h
shmem_fs.h
signal.h
skbuff.h
slab.h [PATCH] mm/slab: fix sparse warnings 2005-09-10 10:06:26 -07:00
smb.h
smb_fs.h
smb_fs_i.h
smb_fs_sb.h
smb_mount.h
smbno.h
smp.h
smp_lock.h
snmp.h
socket.h
sockios.h
som.h
sonet.h
sonypi.h
sort.h
sound.h
soundcard.h
spinlock.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
spinlock_api_smp.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
spinlock_api_up.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
spinlock_types.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
spinlock_types_up.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
spinlock_up.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
stallion.h
stat.h
statfs.h
stddef.h
stop_machine.h
string.h
stringify.h
superhyway.h
suspend.h
swap.h
swapops.h
synclink.h
sys.h
syscalls.h
sysctl.h [NETROM]: Implement G8PZT Circuit reset for NET/ROM 2005-09-12 14:27:37 -07:00
sysdev.h
sysfs.h
sysrq.h
sysv_fs.h
tcp.h
telephony.h
termios.h
textsearch.h
textsearch_fsm.h
thread_info.h
threads.h
ticable.h
time.h [PATCH] time.h: remove ifdefs 2005-09-10 10:06:36 -07:00
timer.h [PATCH] timer initialization cleanup: DEFINE_TIMER 2005-09-09 14:03:48 -07:00
times.h
timex.h
tiocl.h
topology.h
toshiba.h
transport_class.h
trdevice.h
tty.h [PATCH] vesafb: Add blanking support 2005-09-09 13:57:58 -07:00
tty_driver.h
tty_flip.h
tty_ldisc.h
types.h
udf_fs.h
udf_fs_i.h
udf_fs_sb.h
udp.h
ufs_fs.h
ufs_fs_i.h
ufs_fs_sb.h
uinput.h
uio.h
ultrasound.h
umem.h
un.h
unistd.h
usb.h [PATCH] USB: URB_ASYNC_UNLINK flag removed from the kernel 2005-09-08 16:23:04 -07:00
usb_cdc.h
usb_ch9.h
usb_gadget.h
usb_gadgetfs.h
usb_input.h
usb_isp116x.h [PATCH] USB: isp116x-hcd: remove clock() and reset() 2005-09-08 16:22:48 -07:00
usb_otg.h
usb_sl811.h
usbdevice_fs.h [PATCH] USB: fix usbdevice_fs header breakage 2005-09-12 12:23:52 -07:00
user.h
utime.h
uts.h
utsname.h
vermagic.h
vfs.h
via.h
video_decoder.h
video_encoder.h
videodev.h [PATCH] v4l: common part Updates and tuner additions 2005-09-09 13:57:49 -07:00
videodev2.h [PATCH] v4l: common part Updates and tuner additions 2005-09-09 13:57:49 -07:00
videotext.h
vmalloc.h
vt.h
vt_buffer.h
vt_kern.h
wait.h
wanpipe.h
wanrouter.h
watchdog.h
wavefront.h
wireless.h
workqueue.h
writeback.h [PATCH] mm/filemap.c: make two functions static 2005-09-10 10:06:25 -07:00
x25.h
xattr.h
xfrm.h
yam.h
zconf.h
zftape.h
zlib.h
zorro.h
zorro_ids.h
zutil.h