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r: 282107
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c: 7faa33d
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  282105: da44846
  282103: ea4a2d2
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Tejun Heo authored and Jeff Garzik committed Jan 9, 2012
1 parent 472c851 commit 8b00db5
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 90160371b3a3e67ef78d68210a94dd30664a703d
refs/heads/master: 7faa33da9b7add01db9f1ad92c6a5d9145e940a7
75 changes: 0 additions & 75 deletions trunk/Documentation/ABI/stable/sysfs-bus-xen-backend
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77 changes: 0 additions & 77 deletions trunk/Documentation/ABI/stable/sysfs-devices-system-xen_memory
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25 changes: 0 additions & 25 deletions trunk/Documentation/ABI/testing/sysfs-bus-usb
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Expand Up @@ -119,31 +119,6 @@ Description:
Write a 1 to force the device to disconnect
(equivalent to unplugging a wired USB device).

What: /sys/bus/usb/drivers/.../new_id
Date: October 2011
Contact: linux-usb@vger.kernel.org
Description:
Writing a device ID to this file will attempt to
dynamically add a new device ID to a USB device driver.
This may allow the driver to support more hardware than
was included in the driver's static device ID support
table at compile time. The format for the device ID is:
idVendor idProduct bInterfaceClass.
The vendor ID and device ID fields are required, the
interface class is optional.
Upon successfully adding an ID, the driver will probe
for the device and attempt to bind to it. For example:
# echo "8086 10f5" > /sys/bus/usb/drivers/foo/new_id

What: /sys/bus/usb-serial/drivers/.../new_id
Date: October 2011
Contact: linux-usb@vger.kernel.org
Description:
For serial USB drivers, this attribute appears under the
extra bus folder "usb-serial" in sysfs; apart from that
difference, all descriptions from the entry
"/sys/bus/usb/drivers/.../new_id" apply.

What: /sys/bus/usb/drivers/.../remove_id
Date: November 2009
Contact: CHENG Renquan <rqcheng@smu.edu.sg>
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2 changes: 1 addition & 1 deletion trunk/Documentation/ABI/testing/sysfs-driver-hid-logitech-lg4ff
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What: /sys/module/hid_logitech/drivers/hid:logitech/<dev>/range.
Date: July 2011
KernelVersion: 3.2
Contact: Michal Malý <madcatxster@gmail.com>
Contact: Michal Mal� <madcatxster@gmail.com>
Description: Display minimum, maximum and current range of the steering
wheel. Writing a value within min and max boundaries sets the
range of the wheel.
50 changes: 0 additions & 50 deletions trunk/Documentation/DocBook/debugobjects.tmpl
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Expand Up @@ -96,7 +96,6 @@
<listitem><para>debug_object_deactivate</para></listitem>
<listitem><para>debug_object_destroy</para></listitem>
<listitem><para>debug_object_free</para></listitem>
<listitem><para>debug_object_assert_init</para></listitem>
</itemizedlist>
Each of these functions takes the address of the real object and
a pointer to the object type specific debug description
Expand Down Expand Up @@ -274,26 +273,6 @@
debug checks.
</para>
</sect1>

<sect1 id="debug_object_assert_init">
<title>debug_object_assert_init</title>
<para>
This function is called to assert that an object has been
initialized.
</para>
<para>
When the real object is not tracked by debugobjects, it calls
fixup_assert_init of the object type description structure
provided by the caller, with the hardcoded object state
ODEBUG_NOT_AVAILABLE. The fixup function can correct the problem
by calling debug_object_init and other specific initializing
functions.
</para>
<para>
When the real object is already tracked by debugobjects it is
ignored.
</para>
</sect1>
</chapter>
<chapter id="fixupfunctions">
<title>Fixup functions</title>
Expand Down Expand Up @@ -402,35 +381,6 @@
statistics.
</para>
</sect1>
<sect1 id="fixup_assert_init">
<title>fixup_assert_init</title>
<para>
This function is called from the debug code whenever a problem
in debug_object_assert_init is detected.
</para>
<para>
Called from debug_object_assert_init() with a hardcoded state
ODEBUG_STATE_NOTAVAILABLE when the object is not found in the
debug bucket.
</para>
<para>
The function returns 1 when the fixup was successful,
otherwise 0. The return value is used to update the
statistics.
</para>
<para>
Note, this function should make sure debug_object_init() is
called before returning.
</para>
<para>
The handling of statically initialized objects is a special
case. The fixup function should check if this is a legitimate
case of a statically initialized object or not. In this case only
debug_object_init() should be called to make the object known to
the tracker. Then the function should return 0 because this is not
a real fixup.
</para>
</sect1>
</chapter>
<chapter id="bugs">
<title>Known Bugs And Assumptions</title>
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4 changes: 2 additions & 2 deletions trunk/Documentation/HOWTO
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Expand Up @@ -275,8 +275,8 @@ versions.
If no 2.6.x.y kernel is available, then the highest numbered 2.6.x
kernel is the current stable kernel.

2.6.x.y are maintained by the "stable" team <stable@vger.kernel.org>, and
are released as needs dictate. The normal release period is approximately
2.6.x.y are maintained by the "stable" team <stable@kernel.org>, and are
released as needs dictate. The normal release period is approximately
two weeks, but it can be longer if there are no pressing problems. A
security-related problem, instead, can cause a release to happen almost
instantly.
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6 changes: 0 additions & 6 deletions trunk/Documentation/RCU/checklist.txt
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Expand Up @@ -328,12 +328,6 @@ over a rather long period of time, but improvements are always welcome!
RCU rather than SRCU, because RCU is almost always faster and
easier to use than is SRCU.

If you need to enter your read-side critical section in a
hardirq or exception handler, and then exit that same read-side
critical section in the task that was interrupted, then you need
to srcu_read_lock_raw() and srcu_read_unlock_raw(), which avoid
the lockdep checking that would otherwise this practice illegal.

Also unlike other forms of RCU, explicit initialization
and cleanup is required via init_srcu_struct() and
cleanup_srcu_struct(). These are passed a "struct srcu_struct"
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10 changes: 5 additions & 5 deletions trunk/Documentation/RCU/rcu.txt
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Expand Up @@ -38,11 +38,11 @@ o How can the updater tell when a grace period has completed

Preemptible variants of RCU (CONFIG_TREE_PREEMPT_RCU) get the
same effect, but require that the readers manipulate CPU-local
counters. These counters allow limited types of blocking within
RCU read-side critical sections. SRCU also uses CPU-local
counters, and permits general blocking within RCU read-side
critical sections. These variants of RCU detect grace periods
by sampling these counters.
counters. These counters allow limited types of blocking
within RCU read-side critical sections. SRCU also uses
CPU-local counters, and permits general blocking within
RCU read-side critical sections. These two variants of
RCU detect grace periods by sampling these counters.

o If I am running on a uniprocessor kernel, which can only do one
thing at a time, why should I wait for a grace period?
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16 changes: 6 additions & 10 deletions trunk/Documentation/RCU/stallwarn.txt
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Expand Up @@ -101,11 +101,6 @@ o A CPU-bound real-time task in a CONFIG_PREEMPT_RT kernel that
CONFIG_TREE_PREEMPT_RCU case, you might see stall-warning
messages.

o A hardware or software issue shuts off the scheduler-clock
interrupt on a CPU that is not in dyntick-idle mode. This
problem really has happened, and seems to be most likely to
result in RCU CPU stall warnings for CONFIG_NO_HZ=n kernels.

o A bug in the RCU implementation.

o A hardware failure. This is quite unlikely, but has occurred
Expand All @@ -114,11 +109,12 @@ o A hardware failure. This is quite unlikely, but has occurred
This resulted in a series of RCU CPU stall warnings, eventually
leading the realization that the CPU had failed.

The RCU, RCU-sched, and RCU-bh implementations have CPU stall warning.
SRCU does not have its own CPU stall warnings, but its calls to
synchronize_sched() will result in RCU-sched detecting RCU-sched-related
CPU stalls. Please note that RCU only detects CPU stalls when there is
a grace period in progress. No grace period, no CPU stall warnings.
The RCU, RCU-sched, and RCU-bh implementations have CPU stall
warning. SRCU does not have its own CPU stall warnings, but its
calls to synchronize_sched() will result in RCU-sched detecting
RCU-sched-related CPU stalls. Please note that RCU only detects
CPU stalls when there is a grace period in progress. No grace period,
no CPU stall warnings.

To diagnose the cause of the stall, inspect the stack traces.
The offending function will usually be near the top of the stack.
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13 changes: 0 additions & 13 deletions trunk/Documentation/RCU/torture.txt
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Expand Up @@ -61,24 +61,11 @@ nreaders This is the number of RCU reading threads supported.
To properly exercise RCU implementations with preemptible
read-side critical sections.

onoff_interval
The number of seconds between each attempt to execute a
randomly selected CPU-hotplug operation. Defaults to
zero, which disables CPU hotplugging. In HOTPLUG_CPU=n
kernels, rcutorture will silently refuse to do any
CPU-hotplug operations regardless of what value is
specified for onoff_interval.

shuffle_interval
The number of seconds to keep the test threads affinitied
to a particular subset of the CPUs, defaults to 3 seconds.
Used in conjunction with test_no_idle_hz.

shutdown_secs The number of seconds to run the test before terminating
the test and powering off the system. The default is
zero, which disables test termination and system shutdown.
This capability is useful for automated testing.

stat_interval The number of seconds between output of torture
statistics (via printk()). Regardless of the interval,
statistics are printed when the module is unloaded.
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4 changes: 4 additions & 0 deletions trunk/Documentation/RCU/trace.txt
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Expand Up @@ -105,10 +105,14 @@ o "dt" is the current value of the dyntick counter that is incremented
or one greater than the interrupt-nesting depth otherwise.
The number after the second "/" is the NMI nesting depth.

This field is displayed only for CONFIG_NO_HZ kernels.

o "df" is the number of times that some other CPU has forced a
quiescent state on behalf of this CPU due to this CPU being in
dynticks-idle state.

This field is displayed only for CONFIG_NO_HZ kernels.

o "of" is the number of times that some other CPU has forced a
quiescent state on behalf of this CPU due to this CPU being
offline. In a perfect world, this might never happen, but it
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