From: Rusty Russell <rusty@rustcorp.com.au>

The cpu hotplug code actually provides two notifiers: CPU_UP_PREPARE
which preceeds the online and can fail, and CPU_ONLINE which can't.

Current usage is only done at boot, so this distinction doesn't
matter, but it's a bad example to set.  This also means that the
migration threads do not have to be higher priority than the
others, since they are ready to go before any CPU_ONLINE callbacks
are done.

This patch is experimental but fairly straight foward: I haven't been
able to test it since extracting it from the hotplug cpu code, so it's
possible I screwed something up.

From: Rusty Russell <rusty@rustcorp.com.au>

Three more removed CPU notifiers extracted from the hotplug CPU patch.

kernel/softirq.c: the tasklet cpu prepration callback is useless:
the vectors are already initialized to NULL.  Even with the hotplug
CPU patches, they're of little or no use.

fs/buffer.c: once again, they are already initialized to zero.

mm/page_alloc.c: once again, already initialized to zero.

From: Rusty Russell <rusty@rustcorp.com.au>

Move duplicated code to __queue_work(), and don't set the CPU for
queue_delayed_work() until the timer goes off.  The second one only has an
effect on CONFIG_HOTPLUG_CPU where the CPU goes down and the timer goes off
on a different CPU than it was scheduled on.

From: Rusty Russell <rusty@rustcorp.com.au>

Some well-meaning person put a notifier in for CPUs to update the kstat
structures in sched.c.  However, it does nothing, and even with the full
hotplug CPU patch, it still does nothing.

Simple counters very rarely need anything done when CPUs come up or go
down.  If you have per-cpu caches, or per-cpu threads, you need to do
something.  But very rarely for stats.

From: Rusty Russell <rusty@rustcorp.com.au>

These two patches provide the framework for stopping kernel threads to
allow hotplug CPU.  This one just adds kthread.c and kthread.h, next
one uses it.

Most importantly, adds a Monty Python quote to the kernel.

Details:

The hotplug CPU code introduces two major problems:

1) Threads which previously never stopped (migration thread,
   ksoftirqd, keventd) have to be stopped cleanly as CPUs go offline.
2) Threads which previously never had to be created now have
   to be created when a CPU goes online.

Unfortunately, stopping a thread is fairly baroque, involving memory
barriers, a completion and spinning until the task is actually dead
(for example, complete_and_exit() must be used if inside a module).

There are also three problems in starting a thread:
1) Doing it from a random process context risks environment contamination:
   better to do it from keventd to guarantee a clean environment, a-la
   call_usermodehelper.
2) Getting the task struct without races is a hard: see kernel/sched.c
   migration_call(), kernel/workqueue.c create_workqueue_thread().
3) There are races in starting a thread for a CPU which is not yet
   online: migration thread does a complex dance at the moment for
   a similar reason (there may be no migration thread to migrate us).

Place all this logic in some primitives to make life easier:
kthread_create() and kthread_stop().  These primitives require no
extra data-structures in the caller: they operate on normal "struct
task_struct"s.

Other changes:

- Expose keventd_up(), as keventd and migration threads will use kthread to
  launch, and kthread normally uses workqueues and must recognize this case.

- Kthreads created at boot before "keventd" are spawned directly.  However,
  this means that they don't have all signals blocked, and hence can be
  killed.  The simplest solution is to always explicitly block all signals in
  the kthread.

- Change over the migration threads, the workqueue threads and the
  ksoftirqd threads to use kthread.

- module.c currently spawns threads directly to stop the machine, so a
  module can be atomically tested for removal.

- Unfortunately, this means that the current task is manipulated (which
  races with set_cpus_allowed, for example), and it can't set its priority
  artificially high.  Using a kernel thread can solve this cleanly, and with
  kthread_run, it's simple.

- kthreads use keventd, so they inherit its cpus_allowed mask.  Unset it.
  All current users set it explicity anyway, but it's nice to fix.

- call_usermode_helper uses keventd, so the process created inherits its
  cpus_allowed mask.  Unset it.

- Prevent errors in boot when cpus_possible() contains a cpu which is not
  online (ie.  a cpu didn't come up).  This doesn't happen on x86, since a
  boot failure makes that CPU no longer possible (hacky, but it works).

- When the cpu fails to come up, some callbacks do kthread_stop(), which
  doesn't work without keventd (which hasn't started yet).  Call it directly,
  and take care that it restores signal state (note: do_sigaction does a
  flush on blocked signals, so we don't need to repeat it).

From: Dominik Brodowski <linux@dominikbrodowski.de>,
      John Stultz <johnstul@us.ibm.com>,
      Dmitry Torokhov

Add the ACPI Powermanagement Timer as x86 kernel timing source.  Unlike the
Time Stamp Counter, it is a reliable timing source which does not get
affected by aggressive powermanagement features like CPU frequency scaling.

Some ideas and some code are based on Arjan van de Ven's implementation for
2.4, and on R.  Byron Moore's drivers/acpi/hardware/hwtimer.c.


We also replace the loop based delay_pmtmr with a TSC based delay_pmtmr,
which resolves a number of issues caused by the loop based delay.  Unsynced
TSCs as well frequency changing TSCs will effect the length of __delay(), but
it seems this method works best.

From: "Yury V. Umanets" <umka@namesys.com>

This removes a redundant assignment in loop.

From: BlaisorBlade <blaisorblade_spam@yahoo.it>

loop_init doesn't fail gracefully for two reasons:

1) If initialization of loop driver fails, we have an call to
   devfs_add("loop") without any devfs_remove; I add that.

2) On lwn.net 2.6 kernel docs, Jonathan Corbet says: "If you are calling
   add_disk() in your driver initialization routine, you should not fail
   the initialization process after the first call."

So I make loop.c conform to this request by moving add_disk after all
memory allocations.

From: Ben Slusky <sluskyb@paranoiacs.org>

One more patch --- this fixes a minor bio handling bug in the filebacked
code path. I'd fixed it incidentally in the loop-recycle patch.

I don't think you could actually see damage from this bug unless you
run device mapper on top of loop devices, but still this is the correct
behavior.

From: Ben Slusky <sluskyb@paranoiacs.org>

The attached patch changes the loop device transfer functions (including
cryptoloop transfers) to accept page/offset pairs instead of virtual
addresses, and removes the redundant kmaps in do_lo_send, do_lo_receive,
and loop_transfer_bio. Per Andrew Morton's request a while back.

This patch removes the loop feature wherein we remap BIOs for block-backed
loop.  So file-backed and block-backed loop are handled identically.

It cleans up the code a lot and fixes the low-on-memory lockups which
block-backed loop currently suffers.

What we lose is the journalling ordering guarantees which
exts-on-loop-on-blockdev had.  But dm-crypt provides that.

From: Stephen Rothwell <sfr@canb.auug.org.au>

This patch lets 2.6.3-rc4 build and boot on an PPC64 iSeries box (at least
for my configuration).  The veth.o bit in the networking Makefile got there
by accident and should be removed anyway ...

There is more to make it work properly (note the "Temporary hack"), but
this gets us closer.

From: Anton Blanchard <anton@samba.org>

Fix compile warnings and add some type safety to debugger macros.

From: Anton Blanchard <anton@samba.org>

cmd_line was twice the size of saved_command_line but we did a strcpy from
the larger into the smaller.  Create COMMAND_LINE_SIZE and use it.

arch/ppc64/kernel/prom.c:200: warning: missing braces around initializer
arch/ppc64/kernel/prom.c:200: warning: (near initialization for `hmt_thread_data[0]')
arch/ppc64/kernel/prom.c: In function `prom_hold_cpus':
arch/ppc64/kernel/prom.c:1090: warning: implicit declaration of function `_get_PIR'

msg.h uses list_head.  (I'm not sure what config actually required this, but
it is legit).

These no longer do anything.

This patch changes modules API.  It was acked by Arjan@RH and Hubert@Suse.

- Use __pa() around the VGA base address: more friendly for the 4g/4g split.

- Use cpu_relax() rather than open-coding rep_nop().

- Default to 9600 baud

- Move documentation to Documentation/kernel-parameters.txt

- Make CONFIG_EARLY_PRINTK disableable if CONFIG_EMBEDDED

From: Andi Kleen <ak@muc.de>

Implement VGA and serial early printk on x86.  We just include the x86_64
version.

From: Karsten Keil <kkeil@suse.de>

I found a bug in the PPPIOCSPASS PPPIOCSACTIVE IOCTL implementation in
kernel 2.5/2.6.

The current pppd code use a empty filter (uprog.len=0) to detach the filter
in the kernel, but this code was removed in 2.5.71 while fixing a compiler
warning.

Here the new patch, also with better limit checking.

The second patch check for flen == 0 in the filter check too, since later
in this code a filter[flen - 1] access is done, which is not so funny with
flen 0.  Maybe it's not really needed anymore, since with the first patch
it would not longer called with flen=0.

paulus says:

    It looks correct.  Previously we had (and in 2.4 we still have)

        if (uprog.len > 0 && uprog.len < 65536) {
		...

    which gave warnings since uprog.len is unsigned short.  So someone
    decided that both parts of the condition were redundant.

From: Karsten Keil <kkeil@suse.de>

This patch fix a deadlock in HiSax (reported from David Woodhouse
<dwmw2@infradead.org>).  upper layer was called back while holding the card
lock fix is to move the wakeup call into BH handler to avoid direct
callbacks.

From: Karsten Keil <kkeil@suse.de>

- new port of 2.4 I4L core to 2.6

- new port of 2.4 I4L HiSax to 2.6

- fixes for I4L CAPI subsystem to make it stable in 2.6

- fix parameter handling of AVM ISA cards (calle)

- cleanup ISDN config variables

- SMP in act2000 and pcbit driver

- remove check_region in act2000

- mark hysdn, isdnloop and divert as BROKEN_ON_SMP

into ppc970.osdl.org:/home/torvalds/v2.5/linux

Caught by Randy Dunlap.
longrun_cpu_init() only gets called during startup, and calls
other __init routines.

Caught by Randy Dunlap.
longhaul_cpu_init only gets called during startup, and calls
other __init routines.

into ppc970.osdl.org:/home/torvalds/v2.5/linux

into ppc970.osdl.org:/home/torvalds/v2.5/linux

Don't assume the size of a dma_addr_t

Tx descriptor overflow - take II.

Assume tp->dirty_tx = NUM_TX_DESC/2, tp->cur_tx = NUM_TX_DESC - 1,
watch "entry" go beyond NUM_TX_DESC. Actually this is where the same
bug in r8169 driver comes from.

From: Pablo Menichini <pablo@menichini.com.ar>
and maximilian attems <janitor@sternwelten.at>


while looking at kj mails from 200212 and 200301
this patch slept through
originally from: Pablo Menichini <pablo@menichini.com.ar>
rediffed and compile tested
patch applies on plain 2.6.0

maximilian attems <janitor@sternwelten.at>

handle kmalloc failures during init

diff -puN drivers/net/tokenring/3c359.c~tr3c_kmalloc drivers/net/tokenring/3c359.c


 linux-261-bk4-kj1-rddunlap/drivers/net/tokenring/3c359.c |   13 +++++++++++++
 1 files changed, 13 insertions(+)

The transmit routine will stop interrupting and hang, causing the
tx_timeout routine to attempt to restart the device when the 32-bit
cur_tx counter wraps below dirty_tx.  If the device had called
netif_stop_queue it will never call netif_wake_queue in the interrupt
routine (at least on an IA32 system) due to 32-bit wrap around arithmetic.

On my IA32 system 'dirty_tx > lp->cur_tx - TX_RING_SIZE + 2' would
always evaluate to false when dirty and cur_tx were less than 15,
preventing netif_wake_queue to be called.

By starting dirty_tx and cur_tx at 0xfffffff0 (to reduce test time) I
found that once cur_tx wrapped to zero, that transmitted buffers would
never be unmapped or freed because 'while (dirty_tx < lp->cur_tx) {'
was not true.  cur_tx would keep incrementing (in start_xmit) but dirty_tx
would not (in pcnet32_interrupt), thus leaking skb's and pci map entries.
On PPC machines, the system would quickly run out of pci maps.

Fix tested on PPC and IA32.

description:      remove double semi-colon typo;

Add capability to tag self generated ARP packets that are required
for receive load balancing in bonding. VLAN Id's are saved and used
each time a new IP connection is established since 8021q currently
supports IP binding.

Update module version and comment blocks.

Add capability to tag self generated learning packets that are
required to speed up port selection in the switch after a fail
over in bonding since some switches will only update their MAC
tables from tagged packets when VLAN support is turned on. All
VLAN Id's that have been configured on top of the bond interface
will be used in cyclic order.

Now that David Miller accepted the first half of this set into 2.6,
I'm resending the last half to you for inclusion in netdev-2.6.

Tested against latest netdev-2.6. Summary:

Change the bond interface to publish full VLAN hardware acceleration
offloading capabilities, and add capability in all xmit functions to
take special care for VLAN HW accel. tagged skb's that are going out
through a slave that is not offloading capable.

Add a mechanism to collect and save the VLAN Id's that have been
added on top of a bond interface, and propagate the register/add/kill
operations to the slaves.

Add blocking mechanism to prevent adding VLAN interfaces on top of a
bond that contains VLAN challenged slaves and to prevent adding VLAN
challenged slaves to a bond that already has VLAN interfaces on top
of it.

Add a section about VLAN to Documentation/networking/bonding.txt and
also correct some minor spelling/grammer errors.

This patch is the same as to mkiss a while ago, the current code triggers a
bug when reattaching a network device.

to uniquely identify the files, it's necessary to add the version of
each file. Please, don't remove the revision infos. It's really
important for us.

Patch 2/2
[SK98LIN]: Insert revision version and date [back] into the files

Patch 1/2
[SK98LIN]: Added Support for Belkin adapter
[SK98LIN]: Don't handle Yukon2 cards at the moment

The pcnet32 driver uses the incorrect length (of zero) in
pci_[un]map_single for receive buffers.  This is seen with SLAB_DEBUG
enabled.

Tested in IA32 system.  If this patch is not applied after my previous
one hunks #1, #3, and #5 will have an offset of -2 lines.