7 files changed, 83 insertions, 14 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi
index 5ac1e01bbd48..5f500977b42f 100644
--- a/Documentation/ABI/testing/sysfs-class-bdi
+++ b/Documentation/ABI/testing/sysfs-class-bdi
@@ -14,6 +14,10 @@ MAJOR:MINOR
         non-block filesystems which provide their own BDI, such as NFS
         and FUSE.
 
+MAJOR:MINOR-fuseblk
+
+        Value of st_dev on fuseblk filesystems.
+
 default
 
         The default backing dev, used for non-block device backed
diff --git a/Documentation/DocBook/kernel-locking.tmpl b/Documentation/DocBook/kernel-locking.tmpl
index 77c42f40be5d..2510763295d0 100644
--- a/Documentation/DocBook/kernel-locking.tmpl
+++ b/Documentation/DocBook/kernel-locking.tmpl
@@ -703,6 +703,31 @@
 </sect1>
 </chapter>
 
+<chapter id="trylock-functions">
+ <title>The trylock Functions</title>
+  <para>
+   There are functions that try to acquire a lock only once and immediately
+   return a value telling about success or failure to acquire the lock.
+   They can be used if you need no access to the data protected with the lock
+   when some other thread is holding the lock. You should acquire the lock
+   later if you then need access to the data protected with the lock.
+  </para>
+
+  <para>
+    <function>spin_trylock()</function> does not spin but returns non-zero if
+    it acquires the spinlock on the first try or 0 if not. This function can
+    be used in all contexts like <function>spin_lock</function>: you must have
+    disabled the contexts that might interrupt you and acquire the spin lock.
+  </para>
+
+  <para>
+    <function>mutex_trylock()</function> does not suspend your task
+    but returns non-zero if it could lock the mutex on the first try
+    or 0 if not. This function cannot be safely used in hardware or software
+    interrupt contexts despite not sleeping.
+  </para>
+</chapter>
+
   <chapter id="Examples">
    <title>Common Examples</title>
     <para>
diff --git a/Documentation/cpu-freq/governors.txt b/Documentation/cpu-freq/governors.txt
index 6a9c55bd556b..dcec0564d040 100644
--- a/Documentation/cpu-freq/governors.txt
+++ b/Documentation/cpu-freq/governors.txt
@@ -129,14 +129,6 @@ to its default value of '80' it means that between the checking
 intervals the CPU needs to be on average more than 80% in use to then
 decide that the CPU frequency needs to be increased.  
 
-sampling_down_factor: this parameter controls the rate that the CPU
-makes a decision on when to decrease the frequency.  When set to its
-default value of '5' it means that at 1/5 the sampling_rate the kernel
-makes a decision to lower the frequency.  Five "lower rate" decisions
-have to be made in a row before the CPU frequency is actually lower.
-If set to '1' then the frequency decreases as quickly as it increases,
-if set to '2' it decreases at half the rate of the increase.
-
 ignore_nice_load: this parameter takes a value of '0' or '1'. When
 set to '0' (its default), all processes are counted towards the
 'cpu utilisation' value.  When set to '1', the processes that are
diff --git a/Documentation/hwmon/ibmaem b/Documentation/hwmon/ibmaem
new file mode 100644
index 000000000000..2fefaf582a43
--- /dev/null
+++ b/Documentation/hwmon/ibmaem
@@ -0,0 +1,37 @@
+Kernel driver ibmaem
+======================
+
+Supported systems:
+  * Any recent IBM System X server with Active Energy Manager support.
+    This includes the x3350, x3550, x3650, x3655, x3755, x3850 M2,
+    x3950 M2, and certain HS2x/LS2x/QS2x blades.  The IPMI host interface
+    driver ("ipmi-si") needs to be loaded for this driver to do anything.
+    Prefix: 'ibmaem'
+    Datasheet: Not available
+
+Author: Darrick J. Wong
+
+Description
+-----------
+
+This driver implements sensor reading support for the energy and power
+meters available on various IBM System X hardware through the BMC.  All
+sensor banks will be exported as platform devices; this driver can talk
+to both v1 and v2 interfaces.  This driver is completely separate from the
+older ibmpex driver.
+
+The v1 AEM interface has a simple set of features to monitor energy use.
+There is a register that displays an estimate of raw energy consumption
+since the last BMC reset, and a power sensor that returns average power
+use over a configurable interval.
+
+The v2 AEM interface is a bit more sophisticated, being able to present
+a wider range of energy and power use registers, the power cap as
+set by the AEM software, and temperature sensors.
+
+Special Features
+----------------
+
+The "power_cap" value displays the current system power cap, as set by
+the Active Energy Manager software.  Setting the power cap from the host
+is not currently supported.
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index cdd5b934f43e..e07c432c731f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -398,9 +398,6 @@ and is between 256 and 4096 characters. It is defined in the file
         cio_ignore=     [S390]
                         See Documentation/s390/CommonIO for details.
 
-        cio_msg=        [S390]
-                        See Documentation/s390/CommonIO for details.
-
         clock=          [BUGS=X86-32, HW] gettimeofday clocksource override.
                         [Deprecated]
                         Forces specified clocksource (if available) to be used
@@ -689,6 +686,12 @@ and is between 256 and 4096 characters. It is defined in the file
         floppy=         [HW]
                         See Documentation/floppy.txt.
 
+        force_pal_cache_flush
+                        [IA-64] Avoid check_sal_cache_flush which may hang on
+                        buggy SAL_CACHE_FLUSH implementations. Using this
+                        parameter will force ia64_sal_cache_flush to call
+                        ia64_pal_cache_flush instead of SAL_CACHE_FLUSH.
+
         gamecon.map[2|3]=
                         [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
                         support via parallel port (up to 5 devices per port)
diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 3be8ab2a886a..82fafe0429fe 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -157,6 +157,9 @@ struct virtqueue
 
         /* The routine to call when the Guest pings us. */
         void (*handle_output)(int fd, struct virtqueue *me);
+
+        /* Outstanding buffers */
+        unsigned int inflight;
 };
 
 /* Remember the arguments to the program so we can "reboot" */
@@ -702,6 +705,7 @@ static unsigned get_vq_desc(struct virtqueue *vq,
                         errx(1, "Looped descriptor");
         } while ((i = next_desc(vq, i)) != vq->vring.num);
 
+        vq->inflight++;
         return head;
 }
 
@@ -719,6 +723,7 @@ static void add_used(struct virtqueue *vq, unsigned int head, int len)
         /* Make sure buffer is written before we update index. */
         wmb();
         vq->vring.used->idx++;
+        vq->inflight--;
 }
 
 /* This actually sends the interrupt for this virtqueue */
@@ -726,8 +731,9 @@ static void trigger_irq(int fd, struct virtqueue *vq)
 {
         unsigned long buf[] = { LHREQ_IRQ, vq->config.irq };
 
-        /* If they don't want an interrupt, don't send one. */
-        if (vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+        /* If they don't want an interrupt, don't send one, unless empty. */
+        if ((vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+            && vq->inflight)
                 return;
 
         /* Send the Guest an interrupt tell them we used something up. */
@@ -1107,6 +1113,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs,
         vq->next = NULL;
         vq->last_avail_idx = 0;
         vq->dev = dev;
+        vq->inflight = 0;
 
         /* Initialize the configuration. */
         vq->config.num = num_descs;
@@ -1368,6 +1375,7 @@ static void setup_tun_net(const char *arg)
 
         /* Tell Guest what MAC address to use. */
         add_feature(dev, VIRTIO_NET_F_MAC);
+        add_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY);
         set_config(dev, sizeof(conf), &conf);
 
         /* We don't need the socket any more; setup is done. */
diff --git a/Documentation/networking/bridge.txt b/Documentation/networking/bridge.txt
index bdae2db4119c..bec69a8a1697 100644
--- a/Documentation/networking/bridge.txt
+++ b/Documentation/networking/bridge.txt
@@ -1,6 +1,6 @@
 In order to use the Ethernet bridging functionality, you'll need the
 userspace tools. These programs and documentation are available
-at http://bridge.sourceforge.net.  The download page is
+at http://www.linux-foundation.org/en/Net:Bridge.  The download page is
 http://prdownloads.sourceforge.net/bridge.
 
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