10 files changed, 583 insertions, 58 deletions

diff --git a/Documentation/ABI/testing/sysfs-kernel-slab b/Documentation/ABI/testing/sysfs-kernel-slab
new file mode 100644
index 000000000000..6dcf75e594fb
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-kernel-slab
@@ -0,0 +1,479 @@
+What:           /sys/kernel/slab
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The /sys/kernel/slab directory contains a snapshot of the
+                internal state of the SLUB allocator for each cache.  Certain
+                files may be modified to change the behavior of the cache (and
+                any cache it aliases, if any).
+Users:          kernel memory tuning tools
+
+What:           /sys/kernel/slab/cache/aliases
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The aliases file is read-only and specifies how many caches
+                have merged into this cache.
+
+What:           /sys/kernel/slab/cache/align
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The align file is read-only and specifies the cache's object
+                alignment in bytes.
+
+What:           /sys/kernel/slab/cache/alloc_calls
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The alloc_calls file is read-only and lists the kernel code
+                locations from which allocations for this cache were performed.
+                The alloc_calls file only contains information if debugging is
+                enabled for that cache (see Documentation/vm/slub.txt).
+
+What:           /sys/kernel/slab/cache/alloc_fastpath
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The alloc_fastpath file is read-only and specifies how many
+                objects have been allocated using the fast path.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/alloc_from_partial
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The alloc_from_partial file is read-only and specifies how
+                many times a cpu slab has been full and it has been refilled
+                by using a slab from the list of partially used slabs.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/alloc_refill
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The alloc_refill file is read-only and specifies how many
+                times the per-cpu freelist was empty but there were objects
+                available as the result of remote cpu frees.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/alloc_slab
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The alloc_slab file is read-only and specifies how many times
+                a new slab had to be allocated from the page allocator.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/alloc_slowpath
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The alloc_slowpath file is read-only and specifies how many
+                objects have been allocated using the slow path because of a
+                refill or allocation from a partial or new slab.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/cache_dma
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The cache_dma file is read-only and specifies whether objects
+                are from ZONE_DMA.
+                Available when CONFIG_ZONE_DMA is enabled.
+
+What:           /sys/kernel/slab/cache/cpu_slabs
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The cpu_slabs file is read-only and displays how many cpu slabs
+                are active and their NUMA locality.
+
+What:           /sys/kernel/slab/cache/cpuslab_flush
+Date:           April 2009
+KernelVersion:  2.6.31
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file cpuslab_flush is read-only and specifies how many
+                times a cache's cpu slabs have been flushed as the result of
+                destroying or shrinking a cache, a cpu going offline, or as
+                the result of forcing an allocation from a certain node.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/ctor
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The ctor file is read-only and specifies the cache's object
+                constructor function, which is invoked for each object when a
+                new slab is allocated.
+
+What:           /sys/kernel/slab/cache/deactivate_empty
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file deactivate_empty is read-only and specifies how many
+                times an empty cpu slab was deactivated.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/deactivate_full
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file deactivate_full is read-only and specifies how many
+                times a full cpu slab was deactivated.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/deactivate_remote_frees
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file deactivate_remote_frees is read-only and specifies how
+                many times a cpu slab has been deactivated and contained free
+                objects that were freed remotely.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/deactivate_to_head
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file deactivate_to_head is read-only and specifies how
+                many times a partial cpu slab was deactivated and added to the
+                head of its node's partial list.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/deactivate_to_tail
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file deactivate_to_tail is read-only and specifies how
+                many times a partial cpu slab was deactivated and added to the
+                tail of its node's partial list.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/destroy_by_rcu
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The destroy_by_rcu file is read-only and specifies whether
+                slabs (not objects) are freed by rcu.
+
+What:           /sys/kernel/slab/cache/free_add_partial
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file free_add_partial is read-only and specifies how many
+                times an object has been freed in a full slab so that it had to
+                added to its node's partial list.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/free_calls
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The free_calls file is read-only and lists the locations of
+                object frees if slab debugging is enabled (see
+                Documentation/vm/slub.txt).
+
+What:           /sys/kernel/slab/cache/free_fastpath
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The free_fastpath file is read-only and specifies how many
+                objects have been freed using the fast path because it was an
+                object from the cpu slab.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/free_frozen
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The free_frozen file is read-only and specifies how many
+                objects have been freed to a frozen slab (i.e. a remote cpu
+                slab).
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/free_remove_partial
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file free_remove_partial is read-only and specifies how
+                many times an object has been freed to a now-empty slab so
+                that it had to be removed from its node's partial list.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/free_slab
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The free_slab file is read-only and specifies how many times an
+                empty slab has been freed back to the page allocator.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/free_slowpath
+Date:           February 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The free_slowpath file is read-only and specifies how many
+                objects have been freed using the slow path (i.e. to a full or
+                partial slab).
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/hwcache_align
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The hwcache_align file is read-only and specifies whether
+                objects are aligned on cachelines.
+
+What:           /sys/kernel/slab/cache/min_partial
+Date:           February 2009
+KernelVersion:  2.6.30
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                David Rientjes <rientjes@google.com>
+Description:
+                The min_partial file specifies how many empty slabs shall
+                remain on a node's partial list to avoid the overhead of
+                allocating new slabs.  Such slabs may be reclaimed by utilizing
+                the shrink file.
+
+What:           /sys/kernel/slab/cache/object_size
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The object_size file is read-only and specifies the cache's
+                object size.
+
+What:           /sys/kernel/slab/cache/objects
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The objects file is read-only and displays how many objects are
+                active and from which nodes they are from.
+
+What:           /sys/kernel/slab/cache/objects_partial
+Date:           April 2008
+KernelVersion:  2.6.26
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The objects_partial file is read-only and displays how many
+                objects are on partial slabs and from which nodes they are
+                from.
+
+What:           /sys/kernel/slab/cache/objs_per_slab
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file objs_per_slab is read-only and specifies how many
+                objects may be allocated from a single slab of the order
+                specified in /sys/kernel/slab/cache/order.
+
+What:           /sys/kernel/slab/cache/order
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The order file specifies the page order at which new slabs are
+                allocated.  It is writable and can be changed to increase the
+                number of objects per slab.  If a slab cannot be allocated
+                because of fragmentation, SLUB will retry with the minimum order
+                possible depending on its characteristics.
+
+What:           /sys/kernel/slab/cache/order_fallback
+Date:           April 2008
+KernelVersion:  2.6.26
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file order_fallback is read-only and specifies how many
+                times an allocation of a new slab has not been possible at the
+                cache's order and instead fallen back to its minimum possible
+                order.
+                Available when CONFIG_SLUB_STATS is enabled.
+
+What:           /sys/kernel/slab/cache/partial
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The partial file is read-only and displays how long many
+                partial slabs there are and how long each node's list is.
+
+What:           /sys/kernel/slab/cache/poison
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The poison file specifies whether objects should be poisoned
+                when a new slab is allocated.
+
+What:           /sys/kernel/slab/cache/reclaim_account
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The reclaim_account file specifies whether the cache's objects
+                are reclaimable (and grouped by their mobility).
+
+What:           /sys/kernel/slab/cache/red_zone
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The red_zone file specifies whether the cache's objects are red
+                zoned.
+
+What:           /sys/kernel/slab/cache/remote_node_defrag_ratio
+Date:           January 2008
+KernelVersion:  2.6.25
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The file remote_node_defrag_ratio specifies the percentage of
+                times SLUB will attempt to refill the cpu slab with a partial
+                slab from a remote node as opposed to allocating a new slab on
+                the local node.  This reduces the amount of wasted memory over
+                the entire system but can be expensive.
+                Available when CONFIG_NUMA is enabled.
+
+What:           /sys/kernel/slab/cache/sanity_checks
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The sanity_checks file specifies whether expensive checks
+                should be performed on free and, at minimum, enables double free
+                checks.  Caches that enable sanity_checks cannot be merged with
+                caches that do not.
+
+What:           /sys/kernel/slab/cache/shrink
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The shrink file is written when memory should be reclaimed from
+                a cache.  Empty partial slabs are freed and the partial list is
+                sorted so the slabs with the fewest available objects are used
+                first.
+
+What:           /sys/kernel/slab/cache/slab_size
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The slab_size file is read-only and specifies the object size
+                with metadata (debugging information and alignment) in bytes.
+
+What:           /sys/kernel/slab/cache/slabs
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The slabs file is read-only and displays how long many slabs
+                there are (both cpu and partial) and from which nodes they are
+                from.
+
+What:           /sys/kernel/slab/cache/store_user
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The store_user file specifies whether the location of
+                allocation or free should be tracked for a cache.
+
+What:           /sys/kernel/slab/cache/total_objects
+Date:           April 2008
+KernelVersion:  2.6.26
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The total_objects file is read-only and displays how many total
+                objects a cache has and from which nodes they are from.
+
+What:           /sys/kernel/slab/cache/trace
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                The trace file specifies whether object allocations and frees
+                should be traced.
+
+What:           /sys/kernel/slab/cache/validate
+Date:           May 2007
+KernelVersion:  2.6.22
+Contact:        Pekka Enberg <penberg@cs.helsinki.fi>,
+                Christoph Lameter <cl@linux-foundation.org>
+Description:
+                Writing to the validate file causes SLUB to traverse all of its
+                cache's objects and check the validity of metadata.
diff --git a/Documentation/DocBook/kgdb.tmpl b/Documentation/DocBook/kgdb.tmpl
index 372dec20c8da..5cff41a5fa7c 100644
--- a/Documentation/DocBook/kgdb.tmpl
+++ b/Documentation/DocBook/kgdb.tmpl
@@ -281,7 +281,7 @@
     seriously wrong while debugging, it will most often be the case
     that you want to enable gdb to be verbose about its target
     communications.  You do this prior to issuing the <constant>target
-    remote</constant> command by typing in: <constant>set remote debug 1</constant>
+    remote</constant> command by typing in: <constant>set debug remote 1</constant>
     </para>
   </chapter>
   <chapter id="KGDBTestSuite">
diff --git a/Documentation/filesystems/tmpfs.txt b/Documentation/filesystems/tmpfs.txt
index 222437efd75a..3015da0c6b2a 100644
--- a/Documentation/filesystems/tmpfs.txt
+++ b/Documentation/filesystems/tmpfs.txt
@@ -133,4 +133,4 @@ RAM/SWAP in 10240 inodes and it is only accessible by root.
 Author:
    Christoph Rohland <cr@sap.com>, 1.12.01
 Updated:
-   Hugh Dickins <hugh@veritas.com>, 4 June 2007
+   Hugh Dickins, 4 June 2007
diff --git a/Documentation/input/multi-touch-protocol.txt b/Documentation/input/multi-touch-protocol.txt
index 9f09557aea39..a12ea3b586e6 100644
--- a/Documentation/input/multi-touch-protocol.txt
+++ b/Documentation/input/multi-touch-protocol.txt
@@ -18,8 +18,12 @@ Usage
 Anonymous finger details are sent sequentially as separate packets of ABS
 events. Only the ABS_MT events are recognized as part of a finger
 packet. The end of a packet is marked by calling the input_mt_sync()
-function, which generates a SYN_MT_REPORT event. The end of multi-touch
-transfer is marked by calling the usual input_sync() function.
+function, which generates a SYN_MT_REPORT event. This instructs the
+receiver to accept the data for the current finger and prepare to receive
+another. The end of a multi-touch transfer is marked by calling the usual
+input_sync() function. This instructs the receiver to act upon events
+accumulated since last EV_SYN/SYN_REPORT and prepare to receive a new
+set of events/packets.
 
 A set of ABS_MT events with the desired properties is defined. The events
 are divided into categories, to allow for partial implementation.  The
@@ -27,11 +31,26 @@ minimum set consists of ABS_MT_TOUCH_MAJOR, ABS_MT_POSITION_X and
 ABS_MT_POSITION_Y, which allows for multiple fingers to be tracked.  If the
 device supports it, the ABS_MT_WIDTH_MAJOR may be used to provide the size
 of the approaching finger. Anisotropy and direction may be specified with
-ABS_MT_TOUCH_MINOR, ABS_MT_WIDTH_MINOR and ABS_MT_ORIENTATION. Devices with
-more granular information may specify general shapes as blobs, i.e., as a
-sequence of rectangular shapes grouped together by an
-ABS_MT_BLOB_ID. Finally, the ABS_MT_TOOL_TYPE may be used to specify
-whether the touching tool is a finger or a pen or something else.
+ABS_MT_TOUCH_MINOR, ABS_MT_WIDTH_MINOR and ABS_MT_ORIENTATION.  The
+ABS_MT_TOOL_TYPE may be used to specify whether the touching tool is a
+finger or a pen or something else.  Devices with more granular information
+may specify general shapes as blobs, i.e., as a sequence of rectangular
+shapes grouped together by an ABS_MT_BLOB_ID. Finally, for the few devices
+that currently support it, the ABS_MT_TRACKING_ID event may be used to
+report finger tracking from hardware [5].
+
+Here is what a minimal event sequence for a two-finger touch would look
+like:
+
+   ABS_MT_TOUCH_MAJOR
+   ABS_MT_POSITION_X
+   ABS_MT_POSITION_Y
+   SYN_MT_REPORT
+   ABS_MT_TOUCH_MAJOR
+   ABS_MT_POSITION_X
+   ABS_MT_POSITION_Y
+   SYN_MT_REPORT
+   SYN_REPORT
 
 
 Event Semantics
@@ -44,24 +63,24 @@ ABS_MT_TOUCH_MAJOR
 
 The length of the major axis of the contact. The length should be given in
 surface units. If the surface has an X times Y resolution, the largest
-possible value of ABS_MT_TOUCH_MAJOR is sqrt(X^2 + Y^2), the diagonal.
+possible value of ABS_MT_TOUCH_MAJOR is sqrt(X^2 + Y^2), the diagonal [4].
 
 ABS_MT_TOUCH_MINOR
 
 The length, in surface units, of the minor axis of the contact. If the
-contact is circular, this event can be omitted.
+contact is circular, this event can be omitted [4].
 
 ABS_MT_WIDTH_MAJOR
 
 The length, in surface units, of the major axis of the approaching
 tool. This should be understood as the size of the tool itself. The
 orientation of the contact and the approaching tool are assumed to be the
-same.
+same [4].
 
 ABS_MT_WIDTH_MINOR
 
 The length, in surface units, of the minor axis of the approaching
-tool. Omit if circular.
+tool. Omit if circular [4].
 
 The above four values can be used to derive additional information about
 the contact. The ratio ABS_MT_TOUCH_MAJOR / ABS_MT_WIDTH_MAJOR approximates
@@ -70,14 +89,17 @@ different characteristic widths [1].
 
 ABS_MT_ORIENTATION
 
-The orientation of the ellipse. The value should describe half a revolution
-clockwise around the touch center. The scale of the value is arbitrary, but
-zero should be returned for an ellipse aligned along the Y axis of the
-surface. As an example, an index finger placed straight onto the axis could
-return zero orientation, something negative when twisted to the left, and
-something positive when twisted to the right. This value can be omitted if
-the touching object is circular, or if the information is not available in
-the kernel driver.
+The orientation of the ellipse. The value should describe a signed quarter
+of a revolution clockwise around the touch center. The signed value range
+is arbitrary, but zero should be returned for a finger aligned along the Y
+axis of the surface, a negative value when finger is turned to the left, and
+a positive value when finger turned to the right. When completely aligned with
+the X axis, the range max should be returned.  Orientation can be omitted
+if the touching object is circular, or if the information is not available
+in the kernel driver. Partial orientation support is possible if the device
+can distinguish between the two axis, but not (uniquely) any values in
+between. In such cases, the range of ABS_MT_ORIENTATION should be [0, 1]
+[4].
 
 ABS_MT_POSITION_X
 
@@ -98,8 +120,35 @@ ABS_MT_BLOB_ID
 
 The BLOB_ID groups several packets together into one arbitrarily shaped
 contact. This is a low-level anonymous grouping, and should not be confused
-with the high-level contactID, explained below. Most kernel drivers will
-not have this capability, and can safely omit the event.
+with the high-level trackingID [5]. Most kernel drivers will not have blob
+capability, and can safely omit the event.
+
+ABS_MT_TRACKING_ID
+
+The TRACKING_ID identifies an initiated contact throughout its life cycle
+[5]. There are currently only a few devices that support it, so this event
+should normally be omitted.
+
+
+Event Computation
+-----------------
+
+The flora of different hardware unavoidably leads to some devices fitting
+better to the MT protocol than others. To simplify and unify the mapping,
+this section gives recipes for how to compute certain events.
+
+For devices reporting contacts as rectangular shapes, signed orientation
+cannot be obtained. Assuming X and Y are the lengths of the sides of the
+touching rectangle, here is a simple formula that retains the most
+information possible:
+
+   ABS_MT_TOUCH_MAJOR := max(X, Y)
+   ABS_MT_TOUCH_MINOR := min(X, Y)
+   ABS_MT_ORIENTATION := bool(X > Y)
+
+The range of ABS_MT_ORIENTATION should be set to [0, 1], to indicate that
+the device can distinguish between a finger along the Y axis (0) and a
+finger along the X axis (1).
 
 
 Finger Tracking
@@ -109,14 +158,18 @@ The kernel driver should generate an arbitrary enumeration of the set of
 anonymous contacts currently on the surface. The order in which the packets
 appear in the event stream is not important.
 
-The process of finger tracking, i.e., to assign a unique contactID to each
+The process of finger tracking, i.e., to assign a unique trackingID to each
 initiated contact on the surface, is left to user space; preferably the
-multi-touch X driver [3]. In that driver, the contactID stays the same and
+multi-touch X driver [3]. In that driver, the trackingID stays the same and
 unique until the contact vanishes (when the finger leaves the surface). The
 problem of assigning a set of anonymous fingers to a set of identified
 fingers is a euclidian bipartite matching problem at each event update, and
 relies on a sufficiently rapid update rate.
 
+There are a few devices that support trackingID in hardware. User space can
+make use of these native identifiers to reduce bandwidth and cpu usage.
+
+
 Notes
 -----
 
@@ -136,5 +189,7 @@ could be used to derive tilt.
 time of writing (April 2009), the MT protocol is not yet merged, and the
 prototype implements finger matching, basic mouse support and two-finger
 scrolling. The project aims at improving the quality of current multi-touch
-functionality available in the synaptics X driver, and in addition
+functionality available in the Synaptics X driver, and in addition
 implement more advanced gestures.
+[4] See the section on event computation.
+[5] See the section on finger tracking.
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 12df135f8af9..ad2b3078e59c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1545,6 +1545,10 @@ and is between 256 and 4096 characters. It is defined in the file
                         register save and restore. The kernel will only save
                         legacy floating-point registers on task switch.
 
+        noxsave         [BUGS=X86] Disables x86 extended register state save
+                        and restore using xsave. The kernel will fallback to
+                        enabling legacy floating-point and sse state.
+
         nohlt           [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or
                         wfi(ARM) instruction doesn't work correctly and not to
                         use it. This is also useful when using JTAG debugger.
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index ec5de02f543f..b121c5db707f 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1266,13 +1266,22 @@ sctp_rmem - vector of 3 INTEGERs: min, default, max
 sctp_wmem  - vector of 3 INTEGERs: min, default, max
         See tcp_wmem for a description.
 
-UNDOCUMENTED:
 
 /proc/sys/net/core/*
-        dev_weight FIXME
+dev_weight - INTEGER
+        The maximum number of packets that kernel can handle on a NAPI
+        interrupt, it's a Per-CPU variable.
+
+        Default: 64
 
 /proc/sys/net/unix/*
-        max_dgram_qlen FIXME
+max_dgram_qlen - INTEGER
+        The maximum length of dgram socket receive queue
+
+        Default: 10
+
+
+UNDOCUMENTED:
 
 /proc/sys/net/irda/*
         fast_poll_increase FIXME
diff --git a/Documentation/sound/alsa/HD-Audio-Models.txt b/Documentation/sound/alsa/HD-Audio-Models.txt
index 8eec05bc079e..322869fc8a9e 100644
--- a/Documentation/sound/alsa/HD-Audio-Models.txt
+++ b/Documentation/sound/alsa/HD-Audio-Models.txt
@@ -334,6 +334,7 @@ STAC9227/9228/9229/927x
   ref-no-jd     Reference board without HP/Mic jack detection
   3stack        D965 3stack
   5stack        D965 5stack + SPDIF
+  5stack-no-fp  D965 5stack without front panel
   dell-3stack   Dell Dimension E520
   dell-bios     Fixes with Dell BIOS setup
   auto          BIOS setup (default)
diff --git a/Documentation/sound/alsa/Procfile.txt b/Documentation/sound/alsa/Procfile.txt
index bba2dbb79d81..cfac20cf9e33 100644
--- a/Documentation/sound/alsa/Procfile.txt
+++ b/Documentation/sound/alsa/Procfile.txt
@@ -104,6 +104,11 @@ card*/pcm*/xrun_debug
         When this value is greater than 1, the driver will show the
         stack trace additionally.  This may help the debugging.
 
+        Since 2.6.30, this option also enables the hwptr check using
+        jiffies.  This detects spontaneous invalid pointer callback
+        values, but can be lead to too much corrections for a (mostly
+        buggy) hardware that doesn't give smooth pointer updates.
+
 card*/pcm*/sub*/info
         The general information of this PCM sub-stream.
 
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index b716d33912d8..c302ddf629a0 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -39,8 +39,6 @@ Currently, these files are in /proc/sys/vm:
 - nr_hugepages
 - nr_overcommit_hugepages
 - nr_pdflush_threads
-- nr_pdflush_threads_min
-- nr_pdflush_threads_max
 - nr_trim_pages         (only if CONFIG_MMU=n)
 - numa_zonelist_order
 - oom_dump_tasks
@@ -469,32 +467,6 @@ The default value is 0.
 
 ==============================================================
 
-nr_pdflush_threads_min
-
-This value controls the minimum number of pdflush threads.
-
-At boot time, the kernel will create and maintain 'nr_pdflush_threads_min'
-threads for the kernel's lifetime.
-
-The default value is 2.  The minimum value you can specify is 1, and
-the maximum value is the current setting of 'nr_pdflush_threads_max'.
-
-See 'nr_pdflush_threads_max' below for more information.
-
-==============================================================
-
-nr_pdflush_threads_max
-
-This value controls the maximum number of pdflush threads that can be
-created.  The pdflush algorithm will create a new pdflush thread (up to
-this maximum) if no pdflush threads have been available for >= 1 second.
-
-The default value is 8.  The minimum value you can specify is the
-current value of 'nr_pdflush_threads_min' and the
-maximum is 1000.
-
-==============================================================
-
 overcommit_memory:
 
 This value contains a flag that enables memory overcommitment.
diff --git a/Documentation/sysfs-rules.txt b/Documentation/sysfs-rules.txt
index 6049a2a84dda..5d8bc2cd250c 100644
--- a/Documentation/sysfs-rules.txt
+++ b/Documentation/sysfs-rules.txt
@@ -113,7 +113,7 @@ versions of the sysfs interface.
   "devices" directory at /sys/subsystem/<name>/devices.
 
   If /sys/subsystem exists, /sys/bus, /sys/class and /sys/block can be
-  ignored. If it does not exist, you have always to scan all three
+  ignored. If it does not exist, you always have to scan all three
   places, as the kernel is free to move a subsystem from one place to
   the other, as long as the devices are still reachable by the same
   subsystem name.