We can requeue tasks for cheaper then doing a complete dequeue followed by
an enqueue.  Add the requeue_task function and perform it where possible.

This will be hit frequently by upcoming changes to the requeueing in
timeslice granularity.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The minimum timeslice was decreased from 10ms to 5ms.  In the process, the
timeslice granularity was leading to much more rapid round robinning of
interactive tasks at cache trashing levels.

Restore minimum granularity to 10ms.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Timeslice proportion has been increased substantially for -niced tasks.  As
a result of this kernel threads have much larger timeslices than they
previously had.

Change kernel threads' nice value to -5 to bring their timeslice back in
line with previous behaviour.  This means kernel threads will be less
likely to cause large latencies under periods of system stress for normal
nice 0 tasks.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Convert whitespace in sched.c to tabs
Signed-off-by: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Reset cache_hot_time to sane values (in the ms range).  Some recent changes
resulted in values in the us range.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

There is a small problem with the active_load_balance() patch that Darren
sent out last week.  As soon as we discover a potential 'target_cpu' from
'cpu_group' to try to push tasks to, we cease considering other CPUs in
that group as potential 'target_cpu's.  We break out of the
for_each_cpu_mask() loop and try to push tasks to that CPU.  The problem is
that there may well be other idle cpus in that group that we should also
try to push tasks to.  Here is a patch to fix that small problem.  The
solution is to simply move the code that tries to push the tasks into the
for_each_cpu_mask() loop and do away with the whole 'target_cpu' thing
entirely.  Compiled & booted on a 16-way x440.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Allow idle_balance to search an incresingly larger span of cpus to find a
cpu.  Minor change, NODE_SD_INIT gets SD_BALANCE_NEWIDLE flag.  This is
critical for x86_64, where there is only one cpu oer node.  In the current
code, idle_balance for Opteron -never- works.

Signed-off-by: <habanero@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Fix can_migrate to allow aggressive steal for idle cpus.  This -was- in
mainline, but I believe sched_domains kind of blasted it outta there.  IMO,
it's a no brainer for an idle cpu (with all that cache going to waste) to
be granted to steal a task.  The one enhancement I have made was to make
sure the whole cpu was idle.

Signed-off-by: <habanero@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch addresses some problems with wake_idle().  Currently wake_idle()
will wake a task on an alternate cpu if:

1) task->cpu is not idle
2) an idle cpu can be found

However the span of cpus to look for is very limited (only the task->cpu's
sibling).  The scheduler should find the closest idle cpu, starting with
the lowest level domain, then going to higher level domains if allowed
(doamin has flag SD_WAKE_IDLE).  This patch does this.

This and the other two patches (also to be submitted) combined have
provided as much at 5% improvement on that "online transaction DB workload"
and 2% on the industry standard J@EE workload.

I asked Martin Bligh to test these for regression, and he did not find any.
 I would like to submit for inclusion to -mm and barring any problems
eventually to mainline.

Signed-off-by: <habanero@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Avoid unlock-without-lock problem on error path in nfsd4_setclientid_confirm
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

With Keith Owens <kaos@sgi.com>

This patch from Keith Owens fixes a bug in the ia64 port of oprofile when
built without the kdb patch and with a pre-3.4 gcc.

If you build a standard kernel with gcc < 3.4 then
ia64_spinlock_contention_pre3_4 is defined.  But a standard kernel does not
have ia64_spinlock_contention_pre3_4_end, that label is only added by the
kdb patch.  To get the backtrace profiling with gcc < 3.4, the _end label
needs to be added as part of the kernprof patch, then I will remove it from
kdb.
Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Greg Banks <gnb@melbourne.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch makes several tweaks so that an initramfs image can be
completely created by an unprivileged user.  It should maintain
compatibility with previous initramfs early userspace cpio/image creation
and it updates documentation.

There are a few very important tweaks:

CONFIG_INITRAMFS_SOURCE is now either a single cpio archive that is
directly used or a list of directories and files for building a cpio
archive for the initramfs image.  Making the cpio archive listable in
CONFIG_INITRAMFS_SOURCE makes the cpio step more official and automated so
that it doesn't have to be copied by hand to usr/initramfs_data.cpio (I
think this was broken anyway and would be overwritten).  The alternative
list of directories *and* files means that files can be install in a "root"
directory and device-special files can be listed in a file list.

CONFIG_ROOT_UID and CONFIG_ROOT_GID are now available for doing simple
user/group ID translation.  That means that user ID 500, group ID 500 can
create all the files in the "root" directory, but that they can all be
owned by user ID 0, group ID 0 in the cpio image.

Various documentation updates to pull it all together.

Removal of old cruft that was unused/misleading.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

telldir() is broken on large ext3 dir_index'd directories because
getdents() gives d_off==0 for the first entry

Here's a patch which fixes the problem, but note the following warning
from the readdir man page:

       According to POSIX, the dirent structure contains a field char d_name[]
       of  unspecified  size,  with  at most NAME_MAX characters preceding the
       terminating null character.  Use of other fields will harm  the  porta-
       bility  of  your  programs.

Also, as always, telldir() and seekdir() are truly awful interfaces
because they implicitly assume that (a) a directory is a linear data
structure, and (b) that the position in a directory can be expressed
in a cookie which hsa only 31 bits on 32-bit systems. 

So there will be hash colliions that will cause programs that assume
that seekdir(dirent->d_off) will always return the next directory
entry to sometimes lose directory entries in the
not-as-unlikely-as-we-would wish case of a 31-bit hash collision.
Really, any program which is using telldir/seekdir really should be
rewritten to not use these interfaces if at all possible.  So with
these caveats....


What we need to do is wire '.' and '..' to have hash values of (0,0) and
(2,0), respectively, without ignoring other existing dirents with colliding
hashes.  (In those cases the programs will break, but they are statistically
rare, and there's not much we can do in those cases anyway.)
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

According to "initramfs buffer format -- third draft"
http://lwn.net/2002/0117/a/initramfs-buffer-format.php3 "the cpio
"TRAILER!!!" entry (cpio end-of-archive) is optional, but is not ignored"

The kernel handling does not follow this spec.  If you add null padding
after an uncompressed cpio without TRAILER!!!  the kernel complains "no
cpio magic".  In a gzipped archive one gets "junk in gzipped archive"
without the TRAILER!!!

This patch changes the state transitions so the kernel will follow the spec.

Tested: padded uncompressed, padded compressed, unpadded compressed (error)
and trailing junk in compressed (error)

===

I have a boot loader that knows how to load files, determine their size,
and advance to the next 4-byte boundary and reports the total size of the
files loaded.  It doesn't understand about converting this number to some
ASCII representation.

With this patch I can embed the contents of a file padded with NULs
with out knowing the exact size of the file with the following files:

1) file containing cpio header & file name, padded to 4 bytes
2) contents of file
3) pad file of zeros, the size at least as large as the that specified
   for the file.

hpa points out that you should be careful with the headers, use unique
inode numbers and/or add a cpio header with just TRAILER!!!  to reset the
inode hash table to avoid unwanted hard links.  I just put this sequence as
the last files loaded.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch makes gen_init_cpio more complete by adding symlink, pipe and
socket support.  It updates scripts/gen_initramfs_list.sh to support the
new types.  The patch applies to the recent mm series that already have the
updated gen_init_cpio and gen_initramfs_list.sh.

From: William Lee Irwin III <wli@holomorphy.com>

The rest of gen_init_cpio.c seems to cast the result of strlen() to handle
this situation, so this patch follows suit while killing off size_t -related
printk() warnings.
Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Fix init & exit section usage, started with this diagnostic from
reference_discarded.pl (make buildcheck):

Error: ./drivers/misc/ibmasm/module.o .data refers to 00000058 R_386_32          .exit.text
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Attached fixes sysfs naming of sx8 block devs to follow LANANA naming.

You then get /sys/block/sx8!0, etc instead of /sys/block/sx80_0 (device
names should be /dev/sx8/0 instead of /dev/sx80_0)
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Small issue: return value missed in getdents64, but handled in getdents.
Signed-Off-by: Prasanna Meda <pmeda@akamai.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The attached patch fixes the CD-ROM autoclose.  It is broken in recent
kernels for CD-ROMs that do not properly report that the tray is opened.
Now on such a drives the kernel will do one close attempt and check for the
disc again.  This is how it used to work in the past.
Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Acked-by: Alexander Kern <alex.kern@gmx.de>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

proc_create() needs to check that the name of an entry to be created does
not contain a '/' character.

To test, I hacked the ibmveth driver to try to call request_irq with a
bogus "foo/bar" devname.  The creation of the /proc/irq/1234/xxx entry
silently fails, as intended.  Perhaps the irq code should be made to check
for the failure.
Signed-off-by: Nathan Lynch <nathanl@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

A few users of request_irq pass a string with '/'.
As a result, ls -l /proc/irq/*/* will fail to list these entries.
Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Earlier cleanup efforts of the ppc64 IOMMU code have mostly been targeted
at simplifying the allocation schemes and modularising things for the
various platforms.  The IOMMU init functions are still a mess.  This is an
attempt to clean them up and make them somewhat easier to follow.

The new rules are:

1. iommu_init_early_<arch> is called before any PCI/VIO init is done
2. The pcibios fixup routines will call the iommu_{bus,dev}_setup functions
   appropriately as devices are added.

TCE space allocation has changed somewhat:

* On LPARs, nothing is really different. ibm,dma-window properties are still
  used to determine table sizes.
* On pSeries SMP-mode (non-LPAR), the full TCE space per PHB is split up
  in 256MB chunks, each handed out to one child bus/slot as needed. This
  makes current max 7 child buses per PHB, something we're currently below
  on all machine models I'm aware of.
* Exception to the above: Pre-POWER4 machines with Python PHBs have a full
  GB of DMA space allocated at the PHB level, since there are no EADS-level
  tables on such systems.
* PowerMac and Maple still work like before: all buses/slots share one table.
* VIO works like before, ibm,my-dma-window is used like before.
* iSeries has not been touched much at all, besides the changed unit of
  the it_size variable in struct iommu_table.

Other things changed:
* Powermac and maple PCI/IOMMU inits have been changed a bit to conform to
  the new init structure
* pci_dma_direct.c has been renamed pci_direct_iommu.c to match
  pci_iommu.c (see separate patch)
* Likewise, a couple of the pci direct init functions have been renamed.
Signed-off-by: Olof Johansson <olof@austin.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch renames pci_dma_direct.c to pci_direct_iommu.c to comply to the
naming convention of the other iommu files.

This is part of the iommu cleanup, but broken out as a separate patch since
for mainline, a BK rename is more appropriate.  Still, we need a patch to
apply for non-BK-based trees (-mm)
Signed-off-by: Olof Johansson <olof@austin.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch is from Jake Moilanen <moilanen@austin.ibm.com>.

Log machine check errors to error log and NVRAM.
Signed-off-by: Dave Altobelli <dalto@austin.ibm.com>
Signed-off-by: Jake Moilanen <moilanen@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch is from Jake Moilanen <moilanen@austin.ibm.com>.

Changed the naming conventions for head.S to more closely follow the Linux
naming conventions.
Signed-off-by: Jake Moilanen <moilanen@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch is from Jake Moilanen <moilanen@austin.ibm.com>.

Clean-up of traps.c.  Moved the machine dependent calls to a ppc_md call,
and moved the pSeries specific code to ras.c.

I also changed the naming convention to more closely follow the Linux
standards.
Signed-off-by: Jake Moilanen <moilanen@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch is from Nathan Fontenot <nfont@austin.ibm.com> originally.

The PPC64 EEH code needs a small update to start using the
ibm,read-slot-reset-state2 rtas call if available.  The currently used
ibm,read-slot-reset-state call will be going away on future machines.

This patch attempts to use the newer rtas call if available and falls back
the older version otherwise.  This will maintain EEH slot checking
capabilities on all future and current firmware levels.
Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Most special purpose registers on the ppc64 have both the SPR number, and
the various fields within the register defined in asm-ppc64/processor.h.
So far that's not true for the performance counter control registers, MMCR0
and MMCRA.  They have the SPR numbers defined, but the internal fields are
defined in the oprofile code and (just a few) in traps.c where they're
actually used.

This patch moves all the MMCR0 and MMCRA definitions, plus the MSR
performance monitor bit, MSR_PMM, into processor.h.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

OOM kills have been observed with 70% of the pages in lowmem being in the
writeback state.  If we count those pages in sc->nr_scanned, the VM should
throttle and wait for IO completion, instead of OOM killing.

(akpm: this is how the code was designed to work - we broke it six months
ago).
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch is required to fix compile errors for m32r.

This was originally given by the following patch:
  [PATCH] move irq_enter and irq_exit to common code
  http://www.ussg.iu.edu/hypermail/linux/kernel/0411.1/1738.html

I think it was maybe accidentally dropped only for the m32r arch due to a
patching conflict with the other patches or something like that.
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

I'm being at least sometimes deferred to for hugetlb maintenance.
I also originally wrote the fs methods, and generally get stuck
working on it on a regular basis. So here is a MAINTAINERS entry
reflecting that.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

oprofile m32r arch updates, including some API changes.
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Kconfig symbols are always uppercase.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Acked-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

clear_page_range()/4-level page table updates.

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

Patch from Dave Jiang

Signed-off-by: Dave Jiang

This is the IQ80332 platform port that's based off the IOP33x CPU. The IQ80332 is an PCI-express CRB based off the IOP332 processor. Otherwise functionalites are fairly similar to IQ80331.
Signed-off-by: Russell King

Patch from Dave Jiang

Signed-off-by: Dave Jiang

Major cleanup of the 321 PCI defines to make them more coherent. Unified some groups that were per platform to common proc specific. Removed some magic numbers.
Signed-off-by: Russell King