From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

> My screen is still a bit garbeld after booting.
> Still like http://zodiac.dnsalias.org/images/garbage.jpg

Yes, usual boot-time x86 garbage. Well, let's imagine it's as simple
as clearing the framebuffer during boot :) Try this patch and let me
know. If that doesn't help, then the problem is definitely in fbcon.

From: <raven@themaw.net>

These are the ioctls that need to be added to the compatibility layer.

They are all esentially the same as the AUTOFS_IOC_PROTOVER in their 
requirements and so should be fine.

From: Ian Kent <raven@themaw.net>

The case where two process similtaneously trigger a mount in autofs4 can
cause multiple requests to the daemon for the same mount.  The daemon
handles this OK but it's possible an incorrect error to be returned.  For
this reason I believe it is better to change the spin lock to a semaphore
in waitq.c.  This makes the second and subsequent request wait on the q as
ther supposed to.

From: Ian Kent <raven@themaw.net>

Needed for support coming development plans.

From: Ian Kent <raven@themaw.net>

Add ioctl to find out if autofs mount can be umounted.  When the daemon
discovers this it's past the point of no return.

From: <raven@themaw.net>

Pushed changes in sys_chdir and sys_chroot into the revalidate/lookup by
using nameidata hint.

From: Ian Kent <raven@themaw.net>

a. Implement readdir and friends for directory lookup for late mounting.
   This is done largely by replacing a catch all condition in
   try_to_fill_dentry with appropriate cases.

b. Add path calc.  function in waitq.c to get extended path to return to
   daemon (for direct mounts).

c. Add revalidate calls to sys_chdir and sys_chroot so that pwd lookups
   work correctly.

d. Add ioctl to retrieve minor version for automount daemon (and me) to
   recognise module fix level.  Bumped minor version to 5.

From: Hugh Dickins <hugh@veritas.com>

  After chdir (or chroot) to non-existent directory on 2.6.5-mm5, you can no
  longer unmount filesystem holding working directory (or root).

From: <raven@themaw.net>

Patch to sync 2.6.6-rc2-mm2 with the result of my discussion with 
Christoph Hellwig.

Difference is that Christoph realised that merging may_umount_tree and
may_umount was not worth it. They are now seperate functions.

From: Ian Kent <raven@themaw.net>

This patch is the result of an e-mail discussion with Soni Maneesh.  He felt
that the use of reference counts in the expire module is unreliable (in the
presence of rcu) and suggested it should use standard VFS calls where
possible.  This has been done.  Once the boundary in autofs is reached we
have no choice but to resort using reference counts (but under the
vfsmount_lock).


After review by hch:

- renamed autofs4_may_umount to __may_umount_tree, made it static and moved
  it to namespace.c.

- added stub function may_umount_tree with description

- altered may_umount to use above stub function and added little description

- added may_umount_tree prototype to fs.h

- removed the EXPORT_SYMBOL for vfsmount_lock

- updated expire.c to suit

From: Ian Kent <raven@themaw.net>

Remove BKL from autofs4 module and add spinlock to serialise access to the
automount daemon communication waitq.

Locking requirements are different in 2.6 and so I'm seeking comments and
suggestions on this.  I have taken a rather heavy handed approach to this in
the patch.  For example, the VFS operations that directly change the
filesystem, such as autofs4_mkdir etc, hold the inode semaphore on entry so
the BKL has been removed.  I can't see why two locking mechanisms are needed.
 Rather than add locking all over the place, I'm looking for justification
it's needed, as I don't see it myself.

From: Ian Kent <raven@themaw.net>

- Correct text in DPRINTK messages and comments, a little reformating and
  correct URL location for autofs v4 in Kconfig message.

- Fix error-path memory leak in autofs4_fill_super()

From: Ian Kent <raven@themaw.net>

From: Jeff Mahoney <jeffm@suse.com>

I saw a recent bug report that showed when a process set up a dnotify
against the autofs root and then attempted an access(2) call inside the
autofs namespace on a mount that would fail, it would create a
signal/restart loop.

The cause is that the autofs code checks to see if any signals are pending
after it waits on a response from the autofs daemon.  If it finds any, it
assumes that autofs_wait was interrupted, and that it should return
-ERESTARTNOINTR.  The problem with this is that a signal_pending(current)
check will return true if *any* signals were received, not just if a signal
that interrupted the wait was received.  autofs_wait explicitly blocks all
signals except for SIGKILL, SIGQUIT, and SIGINT before calling
interruptible_sleep_on.

The effect is that if a dnotify is set against the autofs root, when the
autofs daemon creates the directory, a dnotify event will be sent to the
originating process.  Since the code in autofs_root_lookup doesn't check to
see what signals are actually pending, it bails early, telling the caller
to try again.  The loop goes on forever until interrupted via one of the
actual interrupting signals.

The following patch makes both autofs_root_lookup and autofs4_root_lookup
verify that one of its defined "shutdown" signals are pending before
bailing out early.  Any other signal should be delivered later, as
expected.  It doesn't matter if the signal occured outside of the sleep in
autofs_wait.  The calling process will either go away or try again.

From: Dave Jones <davej@redhat.com>

To catch accidental usage of floating point.  Has been in -mm for ages.

From: Nick Piggin <nickpiggin@yahoo.com.au>

From: Suresh Siddha <suresh.b.siddha@intel.com>

Node max rebalance interval is too large.  It is currently dependent on
number of online cpus.  For 16 cpu system, max node balance interval in
busy case is 32 seconds.  Agreed that it will use max 32 seconds only when
it doesn't find imbalance for a long time.  But this will lead to slow
response time in cases where load runs for a second with no imbalance and
suddently creates an imbalance.  My patch makes the busy max node rebalance
interval equal to the base [scheduler].

From: Nick Piggin <nickpiggin@yahoo.com.au>

Analysis and basic idea from Suresh Siddha <suresh.b.siddha@intel.com>

"This small change in load_balance() brings the performance back upto base
scheduler(infact I see a ~1.5% performance improvement now).  Basically
this fix removes the unnecessary double_lock.."

Workload is SpecJBB on 16-way Altix.

From: Nick Piggin <nickpiggin@yahoo.com.au>

Fine-tune the unsynched sched_clock handling.

Basically, you need to be careful about ensuring timestamps get correctly
adjusted when moving CPUs, and you *can't* look at your unadjusted
sched_clock() and a remote task's ->timestamp and try to come up with
anything meaningful.

I think this second problem will really hit hard in the activate_task path
on systems with unsynched sched_clock when you're waking up a remote task,
which happens very often.  Andi, I thought some Opterons have unsynched
tscs?  Maybe this is causing your unexplained bad interactivity?

Another problem is a fixup in pull_task.  When adjusting ->timestamp from
one processor to another, you must use timestamp_last_tick for the local
processor too.  Using sched_clock() will cause ->timestamp to creep
forward.

A final small fix is for sync wakeups.  They were using __activate_task for
some reason, thus they don't get credited for sleeping at all AFAIKS.

And another thing, do we want to #ifdef timestamp_last_tick so it doesn't
show on UP?

From: Nick Piggin <nickpiggin@yahoo.com.au>

"Siddha, Suresh B" <suresh.b.siddha@intel.com> noticed a problem in the
cpu_load averaging where the integer truncation could sometimes cause cpu_load
to never quite reach its target.

I'm not sure that you could demonstrate a real world problem, but I quite
like this fix.

Fix bug identified by Chris Mason.

If writeback_inodes is left holding a ref on the superblock's last inode then
the superblock list walk can race with umount and the superblock can be
released.

Take and put a ref against the superblock to fix that.

From: Adam Litke <agl@us.ibm.com>

Teach the x86 stack tracing code to use frame pointers, if they are available.
It eliminates all the false-positives in the normal stack traces.

This is a big improvement, and -fomit-frame-pointer seems to make no
difference at all to generated code size.  Maybe we should kill off
-fomit-frame-pointer.

This fixes a problem with multiple IDE controllers in a system.

The problem is that pcibios_fixups table (in arch/i386/pci/fixup.c) uses
the pci_fixup_ide_trash() quirk for Intel's ICH3 (my case specifically
8086:248b).  This clears any bogus BAR information set up by the BIOS.

In a system which has multiple ICH3's can't use any of the IDE
controllers beside the one on the first ICH3.

Anyhow, the fix is to make sure pci_fixup_ide_trash resets the BARs only
for first time being called, so the subsequent IDE controllers will use
the BIOS BARs.  This is better than "loosing" all these IDE controllers
in the case their BARs set right.

The issue discussed and agreed with Bartlomiej Zolnierkiewicz (see below).

This avoids warnings about unused variables.

into ppc970.osdl.org:/home/torvalds/v2.6/linux

into redhat.com:/spare/repo/i810-audio-2.6

into ppc970.osdl.org:/home/torvalds/v2.6/linux

x86_64 has an incorrect ffs() implementation.  The asm uses "g" instead
of "rm" for the bsfl instruction.  (This was spotted by Yuri Per.)

bsfl does not accept constant values but only memory or register ones.
On i386 the correct "rm" is used.

This causes NTFS build to fail as gcc optimizes a variable into a
constant and ffs() then fails to assemble.

into ppc970.osdl.org:/home/torvalds/v2.6/linux

into kernel.bkbits.net:/home/davem/net-2.6

this trivial fix makes the AVM B1 PCMCIA cards work with 2.6

This adds links to the driver and device inside /sys/class/net/ethX for
PowerPC Virtual Ethernet devices.

This fixes a bug where different partitions were assigned the same MAC
address.  Also, according to Anton, gcc 3.5 didn't like our mac_addr_p
gymnastics, so this ends up fixing that as well.

This patch fixes SMP boot on Apple Xserve G5

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

It is possible to attach a virtual disk to a logical partition on an iSeries
machine so that it is read only to the partition.  This patch allows Linux to
use such virtual disks.

From: Paul Mackerras <paulus@samba.org>

After I sent the recent patch to include/asm-ppc64/io.h which put stronger
barriers in the I/O accessor macros, Paul McKenney pointed out to me that a
writex/outx could still slide out from inside a spinlocked region.  This patch
makes the barriers a bit stronger so that this can't happen.  It means that we
need to use a sync instruction for wmb (a full "heavyweight" sync), since
drivers rely on wmb for ordering between writes to system memory and writes to
a device.

I have left smb_wmb() as a lighter-weight barrier that orders stores, and
doesn't impose an ordering between cacheable and non-cacheable accesses (the
amusingly-named eieio instruction).  I am assuming here that smp_wmb is only
used for ordering stores to system memory so that another cpu will see them in
order.  It can't be used for enforcing any ordering that a device will see,
because it is just a gcc barrier on UP.

This also changes the spinlock/rwlock unlock code to use lwsync ("light-weight
sync") rather than eieio, since eieio doesn't order loads, and we need to
ensure that loads stay inside the spinlocked region.

From: Paul Mackerras <paulus@samba.org>

When I sent the patch to uninline the spinlocks, I inadvertently left out
the change to arch/ppc64/Kconfig which defines the config symbol for
inlining the locks (CONFIG_SPINLINE now).  This patch adds it.  It also
adds a symbol CONFIG_PPC_SPLPAR which enables the code for calling the
hypervisor on shared-processor logically-partitioned system to yield the
physical processor to the lock holder when spinning.  (The code that
depends on this symbol is already present in arch/ppc64/lib/locks.c.)

From: Anton Blanchard <anton@samba.org>

It turns out we do avoid irq recursion on iseries so remove the workaround.

From: Anton Blanchard <anton@samba.org>

We check nvram_fetch/nvram_store against -1, so better not make these
unsigned.