Merge branch 'linus' into core/printk

# subdirectories here. Add them in the ".gitignore" file

# in that subdirectory instead.

#

# NOTE! Please use 'git-ls-files -i --exclude-standard'

# command after changing this file, to see if there are

# any tracked files which get ignored after the change.

#

# Normal rules

#

.*

*.lst

*.symtypes

*.order

*.elf

*.bin

*.gz

#

# Top-level generic files

#

tags

TAGS

vmlinux*

!vmlinux.lds.S

vmlinux

System.map

Module.markers

Module.symvers

!.gitignore

!.mailmap

#

# Generated include files

# cscope files

cscope.*

ncscope.*

*.orig

*~

S: Australia

N: Miguel Ojeda Sandonis

E: maxextreme@gmail.com

W: http://maxextreme.googlepages.com/

E: miguel.ojeda.sandonis@gmail.com

W: http://miguelojeda.es

W: http://jair.lab.fi.uva.es/~migojed/

D: Author of the ks0108, cfag12864b and cfag12864bfb auxiliary display drivers.

D: Maintainer of the auxiliary display drivers tree (drivers/auxdisplay/*)

S: C/ Mieses 20, 9-B

	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

</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>

    runs an instance of gdb against the vmlinux file which contains

    the symbols (not boot image such as bzImage, zImage, uImage...).

    In gdb the developer specifies the connection parameters and

    connects to kgdb.  Depending on which kgdb I/O modules exist in

    the kernel for a given architecture, it may be possible to debug

    the test machine's kernel with the development machine using a

    rs232 or ethernet connection.

    connects to kgdb.  The type of connection a developer makes with

    gdb depends on the availability of kgdb I/O modules compiled as

    builtin's or kernel modules in the test machine's kernel.

    </para>

  </chapter>

  <chapter id="CompilingAKernel">

  </para>

  <para>

  IMPORTANT NOTE: Using this option with kgdb over the console

  (kgdboc) or kgdb over ethernet (kgdboe) is not supported.

  (kgdboc) is not supported.

  </para>

  </sect1>

  </chapter>

    (gdb) target remote /dev/ttyS0

    </programlisting>

    <para>

    Example (kgdb to a terminal server):

    Example (kgdb to a terminal server on tcp port 2012):

    </para>

    <programlisting>

    % gdb ./vmlinux

    (gdb) target remote udp:192.168.2.2:6443

    </programlisting>

    <para>

    Example (kgdb over ethernet):

    </para>

    <programlisting>

    % gdb ./vmlinux

    (gdb) target remote udp:192.168.2.2:6443

    (gdb) target remote 192.168.2.2:2012

    </programlisting>

    <para>

    Once connected, you can debug a kernel the way you would debug an