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r: 84881
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Al Viro authored and David Teigland committed Feb 4, 2008
1 parent 71be847 commit f9740c0
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2 changes: 1 addition & 1 deletion [refs]
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@@ -1,2 +1,2 @@
---
refs/heads/master: dde0013782dbd09e1cc68ca03860f3a62b03cb34
refs/heads/master: 8b0d8e03f847d9c1677b8a193cd124debbc54633
7 changes: 4 additions & 3 deletions trunk/CREDITS
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Expand Up @@ -508,8 +508,12 @@ D: REINER SCT cyberJack pinpad/e-com USB chipcard reader driver
S: Germany

N: Adrian Bunk
E: bunk@stusta.de
P: 1024D/4F12B400 B29C E71E FE19 6755 5C8A 84D4 99FC EA98 4F12 B400
D: misc kernel hacking and testing
S: Grasmeierstrasse 11
S: 80805 Muenchen
S: Germany

N: Ray Burr
E: ryb@nightmare.com
Expand Down Expand Up @@ -1120,9 +1124,6 @@ S: 1150 Ringwood Court
S: San Jose, California 95131
S: USA

N: Adam Fritzler
E: mid@zigamorph.net

N: Fernando Fuganti
E: fuganti@conectiva.com.br
E: fuganti@netbank.com.br
Expand Down
31 changes: 23 additions & 8 deletions trunk/Documentation/00-INDEX
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Expand Up @@ -14,7 +14,6 @@ Following translations are available on the WWW:
- this file.
ABI/
- info on kernel <-> userspace ABI and relative interface stability.

BUG-HUNTING
- brute force method of doing binary search of patches to find bug.
Changes
Expand Down Expand Up @@ -67,8 +66,6 @@ VGA-softcursor.txt
- how to change your VGA cursor from a blinking underscore.
accounting/
- documentation on accounting and taskstats.
acpi/
- info on ACPI-specific hooks in the kernel.
aoe/
- description of AoE (ATA over Ethernet) along with config examples.
applying-patches.txt
Expand Down Expand Up @@ -129,16 +126,18 @@ devices.txt
- plain ASCII listing of all the nodes in /dev/ with major minor #'s.
digiepca.txt
- info on Digi Intl. {PC,PCI,EISA}Xx and Xem series cards.
dnotify.txt
- info about directory notification in Linux.
dontdiff
- file containing a list of files that should never be diff'ed.
driver-model/
- directory with info about Linux driver model.
drivers/
- directory with driver documentation (currently only EDAC).
dvb/
- info on Linux Digital Video Broadcast (DVB) subsystem.
early-userspace/
- info about initramfs, klibc, and userspace early during boot.
edac.txt
- information on EDAC - Error Detection And Correction
eisa.txt
- info on EISA bus support.
exception.txt
Expand All @@ -155,7 +154,7 @@ firmware_class/
- request_firmware() hotplug interface info.
floppy.txt
- notes and driver options for the floppy disk driver.
frv/
fujitsu/
- Fujitsu FR-V Linux documentation.
gpio.txt
- overview of GPIO (General Purpose Input/Output) access conventions.
Expand Down Expand Up @@ -335,8 +334,20 @@ rtc.txt
- notes on how to use the Real Time Clock (aka CMOS clock) driver.
s390/
- directory with info on using Linux on the IBM S390.
scheduler/
- directory with info on the scheduler.
sched-arch.txt
- CPU Scheduler implementation hints for architecture specific code.
sched-coding.txt
- reference for various scheduler-related methods in the O(1) scheduler.
sched-design.txt
- goals, design and implementation of the Linux O(1) scheduler.
sched-design-CFS.txt
- goals, design and implementation of the Complete Fair Scheduler.
sched-domains.txt
- information on scheduling domains.
sched-nice-design.txt
- How and why the scheduler's nice levels are implemented.
sched-stats.txt
- information on schedstats (Linux Scheduler Statistics).
scsi/
- directory with info on Linux scsi support.
serial/
Expand All @@ -349,8 +360,12 @@ sgi-visws.txt
- short blurb on the SGI Visual Workstations.
sh/
- directory with info on porting Linux to a new architecture.
sharedsubtree.txt
- a description of shared subtrees for namespaces.
smart-config.txt
- description of the Smart Config makefile feature.
smp.txt
- a few notes on symmetric multi-processing.
sony-laptop.txt
- Sony Notebook Control Driver (SNC) Readme.
sonypi.txt
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33 changes: 0 additions & 33 deletions trunk/Documentation/ABI/testing/sysfs-bus-usb
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Expand Up @@ -52,36 +52,3 @@ Description:
facility is inherently dangerous, it is disabled by default
for all devices except hubs. For more information, see
Documentation/usb/persist.txt.

What: /sys/bus/usb/device/.../power/connected_duration
Date: January 2008
KernelVersion: 2.6.25
Contact: Sarah Sharp <sarah.a.sharp@intel.com>
Description:
If CONFIG_PM and CONFIG_USB_SUSPEND are enabled, then this file
is present. When read, it returns the total time (in msec)
that the USB device has been connected to the machine. This
file is read-only.
Users:
PowerTOP <power@bughost.org>
http://www.lesswatts.org/projects/powertop/

What: /sys/bus/usb/device/.../power/active_duration
Date: January 2008
KernelVersion: 2.6.25
Contact: Sarah Sharp <sarah.a.sharp@intel.com>
Description:
If CONFIG_PM and CONFIG_USB_SUSPEND are enabled, then this file
is present. When read, it returns the total time (in msec)
that the USB device has been active, i.e. not in a suspended
state. This file is read-only.

Tools can use this file and the connected_duration file to
compute the percentage of time that a device has been active.
For example,
echo $((100 * `cat active_duration` / `cat connected_duration`))
will give an integer percentage. Note that this does not
account for counter wrap.
Users:
PowerTOP <power@bughost.org>
http://www.lesswatts.org/projects/powertop/
99 changes: 0 additions & 99 deletions trunk/Documentation/ABI/testing/sysfs-firmware-acpi

This file was deleted.

2 changes: 1 addition & 1 deletion trunk/Documentation/ABI/testing/sysfs-kernel-uids
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Expand Up @@ -11,4 +11,4 @@ Description:
example would be, if User A has shares = 1024 and user
B has shares = 2048, User B will get twice the CPU
bandwidth user A will. For more details refer
Documentation/scheduler/sched-design-CFS.txt
Documentation/sched-design-CFS.txt
39 changes: 11 additions & 28 deletions trunk/Documentation/BUG-HUNTING
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Expand Up @@ -53,7 +53,7 @@ Finding it the old way

[Sat Mar 2 10:32:33 PST 1996 KERNEL_BUG-HOWTO lm@sgi.com (Larry McVoy)]

This is how to track down a bug if you know nothing about kernel hacking.
This is how to track down a bug if you know nothing about kernel hacking.
It's a brute force approach but it works pretty well.

You need:
Expand All @@ -66,12 +66,12 @@ You will then do:

. Rebuild a revision that you believe works, install, and verify that.
. Do a binary search over the kernels to figure out which one
introduced the bug. I.e., suppose 1.3.28 didn't have the bug, but
introduced the bug. I.e., suppose 1.3.28 didn't have the bug, but
you know that 1.3.69 does. Pick a kernel in the middle and build
that, like 1.3.50. Build & test; if it works, pick the mid point
between .50 and .69, else the mid point between .28 and .50.
. You'll narrow it down to the kernel that introduced the bug. You
can probably do better than this but it gets tricky.
can probably do better than this but it gets tricky.

. Narrow it down to a subdirectory

Expand All @@ -81,27 +81,27 @@ You will then do:
directories:

Copy the non-working directory next to the working directory
as "dir.63".
as "dir.63".
One directory at time, try moving the working directory to
"dir.62" and mv dir.63 dir"time, try
"dir.62" and mv dir.63 dir"time, try

mv dir dir.62
mv dir.63 dir
find dir -name '*.[oa]' -print | xargs rm -f

And then rebuild and retest. Assuming that all related
changes were contained in the sub directory, this should
isolate the change to a directory.
changes were contained in the sub directory, this should
isolate the change to a directory.

Problems: changes in header files may have occurred; I've
found in my case that they were self explanatory - you may
found in my case that they were self explanatory - you may
or may not want to give up when that happens.

. Narrow it down to a file

- You can apply the same technique to each file in the directory,
hoping that the changes in that file are self contained.

hoping that the changes in that file are self contained.
. Narrow it down to a routine

- You can take the old file and the new file and manually create
Expand Down Expand Up @@ -130,7 +130,7 @@ You will then do:
that makes the difference.

Finally, you take all the info that you have, kernel revisions, bug
description, the extent to which you have narrowed it down, and pass
description, the extent to which you have narrowed it down, and pass
that off to whomever you believe is the maintainer of that section.
A post to linux.dev.kernel isn't such a bad idea if you've done some
work to narrow it down.
Expand Down Expand Up @@ -214,23 +214,6 @@ And recompile the kernel with CONFIG_DEBUG_INFO enabled:
gdb vmlinux
(gdb) p vt_ioctl
(gdb) l *(0x<address of vt_ioctl> + 0xda8)
or, as one command
(gdb) l *(vt_ioctl + 0xda8)

If you have a call trace, such as :-
>Call Trace:
> [<ffffffff8802c8e9>] :jbd:log_wait_commit+0xa3/0xf5
> [<ffffffff810482d9>] autoremove_wake_function+0x0/0x2e
> [<ffffffff8802770b>] :jbd:journal_stop+0x1be/0x1ee
> ...
this shows the problem in the :jbd: module. You can load that module in gdb
and list the relevant code.
gdb fs/jbd/jbd.ko
(gdb) p log_wait_commit
(gdb) l *(0x<address> + 0xa3)
or
(gdb) l *(log_wait_commit + 0xa3)


Another very useful option of the Kernel Hacking section in menuconfig is
Debug memory allocations. This will help you see whether data has been
Expand Down
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