Simply, pass off to kset_find_obj() to iterate over list of buses and 
search for bus with certain name.

The operation is simple:
- Take read lock for kset.
- Iterate over kset->list.
- Compare name to each kobject's name.
- Return kobject if found. 

This creates and exports device_bind_driver() and device_release_driver()
that allow a caller to manually bind a device to a driver. Apparantly, some
drivers use this functionality (like USB): a driver binds to other device
interfaces during the driver's probe() method call for the first interface.

Implementation is easy enough, since it simply involves renaming and exporting
the internal functions attach() and detach().

In drivers/base/bus.c, get_bus() was called without put_bus() in these 
functions:

- bus_for_each_dev()
- bus_for_each_drv()

into osdl.org:/home/mochel/src/kernel/devel/linux-2.5-kobject

- declare net_subsys, and register during net_dev_init().
- Add kobject to struct net_device.
- initialize name and register in register_netdevice().
- remove in unregister_netdevice().

This allows one to see the registered network devices in the system via:

# tree /sys/net/
/sys/net/
`-- eth0

Since block_subsys already contains a list and a lock, use those, instead
of defining our own static ones.

This allows struct gendisk::full_list to be removed. 

struct gendisk::list is also apparently unused, so it is removed also.

This was never used, and a bad idea to begin with. 

The kobject core no longer references a subsystem directly through a kobject,
instead using the kobject's dominant kset to reference the subsystem. The 
registrants of kobjects have been fixed up. 

To aid in this process, a few helpers were introdcuced: 

- kobj_set_kset_s(obj,subsys)
- kset_set_kset_s(obj,subsys)
- subsys_set_kset(obj,subsys)

that set the kset ptr of embedded kobjects for objects that have different
embedded types. See include/linux/kobject.h for more description and usage.


struct subsystem::kobj is also removed, relying solely on a subsystem's
embedded kset for hierarchy information.  Since this requires modification
of the subsystem declarations, a helper macro has been defined:

decl_subsys(name,type)

which initializes the name and ktype fields of the subsystem's embedded
kset. All the subsystem declarations have been fixed up.

struct kset is what struct subsystem should have originally been called. It
is a set of kobjects, and nothing more, with a much less confusing name than
'subsystem.'

struct kset contains an embedded kobject, making it possible to represent it
in the object hierarchy, and sysfs. This also provides a means for objects
to easily express a list of subordinate objects. 

struct subsystem still exists, and contains an rwsem, which its subordinate
ksets use to protect their lists. 

An arbitrary number of ksets may belong to a subsystem. A ksets specifies
the subsystem it belongs to via its ->subsys field. 

struct subsystem also contains a default kset, which may be used without
having to define a separate kset. 

The objects that defined subordinate subsystems (bus and class drivers) have
been converted to use subordinate ksets instead.


Note that the usage of ksets is flexible. 
- ksets may contain a list of objects of any type, not just kobjects.
- The objects registered with a kset do not have to be registered.
- ksets themselves do not have to be registered. One can be used by
  simply calling kset_init(). 
- ksets do not need a name if they are not registered. 
- Note however that locking must be done manually in these cases.

into osdl.org:/home/mochel/src/kernel/devel/linux-2.5-core

into osdl.org:/home/mochel/src/kernel/devel/linux-2.5-virgin

into osdl.org:/home/mochel/src/kernel/devel/linux-2.5-virgin

into home.transmeta.com:/home/torvalds/v2.5/linux

This is just to make x86-64 boot with IOMMU and compiled in AGP driver
again.  Previously both AGP and the IOMMU code would set up an aperture,
with AGP being winner, messing up pci_map_*.

This is needed for the x86-64 update for 2.5.54 I sent earlier.

Actually using /dev/agpgart still corrupts memory unfortunately, haven't
tracked that down yet.

I also commented on some (usually 64bit, but at least one 32bit) bugs in
the driver too.

These changes should be all nops on i386.

 - Export amd k8 init function for x86-64.  It needs to be called early
   by the iommu code.  Add some comments to warn about about that (the
   upcoming VIA and SIS K8 chipsets will have the same problem)
 - Declare gatt table as u32 following the AGP spec.
 - Comment some bugs.

More x86-64 updates for 2.5.54.  Most noticeable change is that the
64bit X server works again.

This only changes x86-64 specific files.  It requires some AGP driver
changes I'm sending separately.

 - Some Makefile cleanups from Sam Ravnborg
 - Make sure extended registers in 32bit processes are zeroed and not
   accessible/changeable from ptrace.  This is to avoid potential
   security bugs with non 64bit clean 32bit emulation functions (they
   often are overflow prone etc.)
 - Some 32bit emulation cleanups from Stephen Rothwell
 - Make copy_*_user source const to fix warnings.
 - Set fs/gs to dummy values when the 64bit segment base is set to not
   confuse the context switch (Karsten Keil, me)
	* still one mysterious bug in this area unfortunately.
 - Make MAP_32BIT for 64bit processes only map in the first 31bit,
   because it is usually used to map small model code.  This fixes the X
   server crashes.  Some cleanups in this area.
 - Don't set O_LARGEFILE for 32bit open
 - Handle ptregs calls from 32bit syscall correctly.
 - Implement aio io_getevents for 32bit.
 - Remove buggy unused command handler in nfsd 32bit emulation.
 - Convert timespec in semtimedop (thanks to Anton for telling me about
   this)
 - Ignore long mode flag from 32bit modify_ldt.  This fixes Wine, which
   left it uninitialized (bug found by Karsten Keil)
 - Merge with i386
 - Handle new kallsyms
 - Remove some superfluous bootup printks

into home.transmeta.com:/home/torvalds/v2.5/linux

into raven.il.steeleye.com:/home/jejb/BK/scsi-for-linus-2.5

Wondering why my CD-writer did not have a name in sysfs, I saw
that when the name is longer than 50 bytes no name at all is used.
The (much smaller) code below constructs a truncated name instead.

This patch fixes the handling of IOPL when sysenter is used.

Currently when entering kernel mode, IOPL is not changed and it is not
presserved across context switches: thus, in the kernel, the IOPL value
is random.

This is not a problem when using iret, because it restores eflags, but
the sysexit code currently doesn't, which means that that IOPL becomes
random in user mode too which is of course not good.

This patch fixes the problem by saving eflags across context switches.

Also update zalon to C99 initialisers

- Remove unused class_list.
- Use lists in subordinate subsystems for storing lists of devices and
  drivers.
- Rename 'drvsubsys' to 'drivers' and 'devsubsys' to 'devices', to be more
  meaningful.

- Remove devices list, in favor of using the list in the subordinate
  devices subsystem.
- Rename devsubsys to 'devices' and drvsubsys to 'drivers'.
- Use bus's rwsem when iterating over drivers, instead of the 
  subordinate driver subsystem's. (We use that one when adding the 
  driver, and binding it to devices).

This is the first step in morphing struct subsystem into something meaningful.

A subsystem is defined simply as a list of kobjects of a certain type, which
is far too generic. A subsystem should be representative of a large entity
of code (i.e. a subsystem of the kernel), not just a simple list. 

This changeset:

- Creates struct kobj_type, a descriptor of the type a kobject is embedded
  in.

- Extracts the fields that are specific to a particular object type from
  struct subsystem and puts them in struct kobj_type, which are
  - the object's release method.
  - the sysfs operations for the object type.
  - the default attributes of the object type.

- Adds ptr to struct kobject to point to its type descriptor. 

- Converts the existing subsystem definitions to define struct kobj_type. 


struct kobj_type's are not registered, as they do not have any explicit
representation in the object hierarchy, nor do they have any fields that
need runtime initialization. 

A kobject's ktype should be set when it is registered, like its subsystem.
Note this obviates the need for defining a struct subsystem when an object
type does not need to be kept in a global list. 

into osdl.org:/home/mochel/src/kernel/devel/linux-2.5-virgin

The Zalon card is a GSC 53c720 based card.  This driver adopts
the ncr53c8xx driver for the purpose.

into home.transmeta.com:/home/torvalds/v2.5/linux

into tp1.ruhr-uni-bochum.de:/home/kai/kernel/v2.5/linux-2.5.isdn

When separating out the duplicated xmit handling, we were lucky that
we could reuse BC_Send_Data for our purposes. Introduce a more
extensible "struct bc_l1_ops" instead, and initialize that in
the code that provides the functionality, not in the users.

Realize that *_empty_fifo() and *_fill_fifo() are always called
under the card lock, so no additional protection when reading/writing
fifos is needed.

Same thing which just happened to hscx_irq.c - Use the struct
bc_hw_ops instead of macros and inlining.

Each driver for HSCX based cards defined some hardware access macros
and #include'd hscx_irq.c. Instead, we now add the needed routines to
the corresponding bc_hw_ops and use regular function calls. It's a slight
bit less efficient, but shouldn't be noticable.

Using {isac,hscx}_{read,write} instead of the low-level
readreg/writereg simplifies the code a bit.

Preparing for un-inlining hscx_irq.c, we add operations needed
to access the B-Channel FIFO's, similar to what we already have
for the D-Channel.

Basically only a cosmetic patch, with much renaming and a little
rearranging of code.