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r: 101183
b: refs/heads/master
c: 88f85a5
h: refs/heads/master
i:
  101181: 82c654c
  101179: fa273e4
  101175: 46c25f9
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  101151: 9c5bb86
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Marcin Slusarz authored and Dave Kleikamp committed May 12, 2008
1 parent 1d9276d commit f64d418
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 14351760e314b8a9720804b11c6bd11d0c0b1258
refs/heads/master: 88f85a55c0645c2b7e03bf34d2a90eddf6de34fa
13 changes: 3 additions & 10 deletions trunk/.gitignore
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# 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
#
.*
Expand All @@ -22,21 +18,18 @@
*.lst
*.symtypes
*.order
*.elf
*.bin
*.gz

#
# Top-level generic files
#
tags
TAGS
vmlinux
vmlinux*
!vmlinux.lds.S
System.map
Module.markers
Module.symvers
!.gitignore
!.mailmap

#
# Generated include files
Expand All @@ -59,8 +52,8 @@ series

# cscope files
cscope.*
ncscope.*

*.orig
*.rej
*~
\#*#
5 changes: 2 additions & 3 deletions trunk/CREDITS
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Expand Up @@ -2611,9 +2611,8 @@ S: Perth, Western Australia
S: Australia

N: Miguel Ojeda Sandonis
E: miguel.ojeda.sandonis@gmail.com
W: http://miguelojeda.es
W: http://jair.lab.fi.uva.es/~migojed/
E: maxextreme@gmail.com
W: http://maxextreme.googlepages.com/
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
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34 changes: 0 additions & 34 deletions trunk/Documentation/ABI/testing/sysfs-block
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Expand Up @@ -26,37 +26,3 @@ Description:
I/O statistics of partition <part>. The format is the
same as the above-written /sys/block/<disk>/stat
format.


What: /sys/block/<disk>/integrity/format
Date: June 2008
Contact: Martin K. Petersen <martin.petersen@oracle.com>
Description:
Metadata format for integrity capable block device.
E.g. T10-DIF-TYPE1-CRC.


What: /sys/block/<disk>/integrity/read_verify
Date: June 2008
Contact: Martin K. Petersen <martin.petersen@oracle.com>
Description:
Indicates whether the block layer should verify the
integrity of read requests serviced by devices that
support sending integrity metadata.


What: /sys/block/<disk>/integrity/tag_size
Date: June 2008
Contact: Martin K. Petersen <martin.petersen@oracle.com>
Description:
Number of bytes of integrity tag space available per
512 bytes of data.


What: /sys/block/<disk>/integrity/write_generate
Date: June 2008
Contact: Martin K. Petersen <martin.petersen@oracle.com>
Description:
Indicates whether the block layer should automatically
generate checksums for write requests bound for
devices that support receiving integrity metadata.
35 changes: 0 additions & 35 deletions trunk/Documentation/ABI/testing/sysfs-bus-css
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4 changes: 0 additions & 4 deletions trunk/Documentation/ABI/testing/sysfs-class-bdi
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Expand Up @@ -14,10 +14,6 @@ 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
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71 changes: 0 additions & 71 deletions trunk/Documentation/ABI/testing/sysfs-firmware-memmap
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25 changes: 0 additions & 25 deletions trunk/Documentation/DocBook/kernel-locking.tmpl
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Expand Up @@ -703,31 +703,6 @@
</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>
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20 changes: 14 additions & 6 deletions trunk/Documentation/DocBook/kgdb.tmpl
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Expand Up @@ -84,9 +84,10 @@
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. 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.
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.
</para>
</chapter>
<chapter id="CompilingAKernel">
Expand Down Expand Up @@ -222,7 +223,7 @@
</para>
<para>
IMPORTANT NOTE: Using this option with kgdb over the console
(kgdboc) is not supported.
(kgdboc) or kgdb over ethernet (kgdboe) is not supported.
</para>
</sect1>
</chapter>
Expand All @@ -248,11 +249,18 @@
(gdb) target remote /dev/ttyS0
</programlisting>
<para>
Example (kgdb to a terminal server on tcp port 2012):
Example (kgdb to a terminal server):
</para>
<programlisting>
% gdb ./vmlinux
(gdb) target remote 192.168.2.2:2012
(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
</programlisting>
<para>
Once connected, you can debug a kernel the way you would debug an
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Expand Up @@ -377,7 +377,7 @@ Bug Reporting
bugzilla.kernel.org is where the Linux kernel developers track kernel
bugs. Users are encouraged to report all bugs that they find in this
tool. For details on how to use the kernel bugzilla, please see:
http://bugzilla.kernel.org/page.cgi?id=faq.html
http://test.kernel.org/bugzilla/faq.html

The file REPORTING-BUGS in the main kernel source directory has a good
template for how to report a possible kernel bug, and details what kind
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37 changes: 9 additions & 28 deletions trunk/Documentation/IRQ-affinity.txt
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ChangeLog:
Started by Ingo Molnar <mingo@redhat.com>
Update by Max Krasnyansky <maxk@qualcomm.com>

SMP IRQ affinity
SMP IRQ affinity, started by Ingo Molnar <mingo@redhat.com>


/proc/irq/IRQ#/smp_affinity specifies which target CPUs are permitted
for a given IRQ source. It's a bitmask of allowed CPUs. It's not allowed
to turn off all CPUs, and if an IRQ controller does not support IRQ
affinity then the value will not change from the default 0xffffffff.

/proc/irq/default_smp_affinity specifies default affinity mask that applies
to all non-active IRQs. Once IRQ is allocated/activated its affinity bitmask
will be set to the default mask. It can then be changed as described above.
Default mask is 0xffffffff.

Here is an example of restricting IRQ44 (eth1) to CPU0-3 then restricting
it to CPU4-7 (this is an 8-CPU SMP box):
the IRQ to CPU4-7 (this is an 8-CPU SMP box):

[root@moon 44]# cd /proc/irq/44
[root@moon 44]# cat smp_affinity
ffffffff

[root@moon 44]# echo 0f > smp_affinity
[root@moon 44]# cat smp_affinity
0000000f
Expand All @@ -30,27 +21,17 @@ PING hell (195.4.7.3): 56 data bytes
--- hell ping statistics ---
6029 packets transmitted, 6027 packets received, 0% packet loss
round-trip min/avg/max = 0.1/0.1/0.4 ms
[root@moon 44]# cat /proc/interrupts | grep 'CPU\|44:'
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
44: 1068 1785 1785 1783 0 0 0 0 IO-APIC-level eth1

As can be seen from the line above IRQ44 was delivered only to the first four
processors (0-3).
Now lets restrict that IRQ to CPU(4-7).

[root@moon 44]# cat /proc/interrupts | grep 44:
44: 0 1785 1785 1783 1783 1
1 0 IO-APIC-level eth1
[root@moon 44]# echo f0 > smp_affinity
[root@moon 44]# cat smp_affinity
000000f0
[root@moon 44]# ping -f h
PING hell (195.4.7.3): 56 data bytes
..
--- hell ping statistics ---
2779 packets transmitted, 2777 packets received, 0% packet loss
round-trip min/avg/max = 0.1/0.5/585.4 ms
[root@moon 44]# cat /proc/interrupts | 'CPU\|44:'
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
44: 1068 1785 1785 1783 1784 1069 1070 1069 IO-APIC-level eth1

This time around IRQ44 was delivered only to the last four processors.
i.e counters for the CPU0-3 did not change.
[root@moon 44]# cat /proc/interrupts | grep 44:
44: 1068 1785 1785 1784 1784 1069 1070 1069 IO-APIC-level eth1
[root@moon 44]#

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