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c: b92dccf
h: refs/heads/master
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  23853: d6679db
  23851: fc19321
  23847: 041939f
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Trond Myklebust authored and Trond Myklebust committed Mar 20, 2006
1 parent 38c2a22 commit 7981f51
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 2e9abdd9bad485970b37cd53a82f92702054984c
refs/heads/master: b92dccf65bab3b6b7deb79ff3321dc256eb0f53b
3 changes: 0 additions & 3 deletions trunk/.gitignore
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Expand Up @@ -16,7 +16,6 @@
#
# Top-level generic files
#
tags
vmlinux*
System.map
Module.symvers
Expand All @@ -31,5 +30,3 @@ include/linux/autoconf.h
include/linux/compile.h
include/linux/version.h

# stgit generated dirs
patches-*
13 changes: 5 additions & 8 deletions trunk/CREDITS
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Expand Up @@ -2007,14 +2007,13 @@ S: University of Stuttgart, Germany and
S: Ecole Nationale Superieure des Telecommunications, Paris

N: Jamie Lokier
E: jamie@shareable.org
W: http://www.shareable.org/
E: jamie@imbolc.ucc.ie
D: Reboot-through-BIOS for broken 486 motherboards
D: Parport fixes, futex improvements
D: First instruction of x86 sysenter path :)
S: 51 Sunningwell Road
D: Some parport fixes
S: 11 Goodson Walk
S: Marston
S: Oxford
S: OX1 4SZ
S: OX3 0HX
S: United Kingdom

N: Mark Lord
Expand Down Expand Up @@ -2814,8 +2813,6 @@ E: luca.risolia@studio.unibo.it
P: 1024D/FCE635A4 88E8 F32F 7244 68BA 3958 5D40 99DA 5D2A FCE6 35A4
D: V4L driver for W996[87]CF JPEG USB Dual Mode Camera Chips
D: V4L2 driver for SN9C10x PC Camera Controllers
D: V4L2 driver for ET61X151 and ET61X251 PC Camera Controllers
D: V4L2 driver for ZC0301 Image Processor and Control Chip
S: Via Liberta' 41/A
S: Osio Sotto, 24046, Bergamo
S: Italy
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113 changes: 0 additions & 113 deletions trunk/Documentation/BUG-HUNTING
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Table of contents
=================

Last updated: 20 December 2005

Contents
========

- Introduction
- Devices not appearing
- Finding patch that caused a bug
-- Finding using git-bisect
-- Finding it the old way
- Fixing the bug

Introduction
============

Always try the latest kernel from kernel.org and build from source. If you are
not confident in doing that please report the bug to your distribution vendor
instead of to a kernel developer.

Finding bugs is not always easy. Have a go though. If you can't find it don't
give up. Report as much as you have found to the relevant maintainer. See
MAINTAINERS for who that is for the subsystem you have worked on.

Before you submit a bug report read REPORTING-BUGS.

Devices not appearing
=====================

Often this is caused by udev. Check that first before blaming it on the
kernel.

Finding patch that caused a bug
===============================



Finding using git-bisect
------------------------

Using the provided tools with git makes finding bugs easy provided the bug is
reproducible.

Steps to do it:
- start using git for the kernel source
- read the man page for git-bisect
- have fun

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.
Expand Down Expand Up @@ -143,63 +90,3 @@ it does work and it lets non-hackers help fix bugs. And it is cool
because Linux snapshots will let you do this - something that you can't
do with vendor supplied releases.

Fixing the bug
==============

Nobody is going to tell you how to fix bugs. Seriously. You need to work it
out. But below are some hints on how to use the tools.

To debug a kernel, use objdump and look for the hex offset from the crash
output to find the valid line of code/assembler. Without debug symbols, you
will see the assembler code for the routine shown, but if your kernel has
debug symbols the C code will also be available. (Debug symbols can be enabled
in the kernel hacking menu of the menu configuration.) For example:

objdump -r -S -l --disassemble net/dccp/ipv4.o

NB.: you need to be at the top level of the kernel tree for this to pick up
your C files.

If you don't have access to the code you can also debug on some crash dumps
e.g. crash dump output as shown by Dave Miller.

> EIP is at ip_queue_xmit+0x14/0x4c0
> ...
> Code: 44 24 04 e8 6f 05 00 00 e9 e8 fe ff ff 8d 76 00 8d bc 27 00 00
> 00 00 55 57 56 53 81 ec bc 00 00 00 8b ac 24 d0 00 00 00 8b 5d 08
> <8b> 83 3c 01 00 00 89 44 24 14 8b 45 28 85 c0 89 44 24 18 0f 85
>
> Put the bytes into a "foo.s" file like this:
>
> .text
> .globl foo
> foo:
> .byte .... /* bytes from Code: part of OOPS dump */
>
> Compile it with "gcc -c -o foo.o foo.s" then look at the output of
> "objdump --disassemble foo.o".
>
> Output:
>
> ip_queue_xmit:
> push %ebp
> push %edi
> push %esi
> push %ebx
> sub $0xbc, %esp
> mov 0xd0(%esp), %ebp ! %ebp = arg0 (skb)
> mov 0x8(%ebp), %ebx ! %ebx = skb->sk
> mov 0x13c(%ebx), %eax ! %eax = inet_sk(sk)->opt

Another very useful option of the Kernel Hacking section in menuconfig is
Debug memory allocations. This will help you see whether data has been
initialised and not set before use etc. To see the values that get assigned
with this look at mm/slab.c and search for POISON_INUSE. When using this an
Oops will often show the poisoned data instead of zero which is the default.

Once you have worked out a fix please submit it upstream. After all open
source is about sharing what you do and don't you want to be recognised for
your genius?

Please do read Documentation/SubmittingPatches though to help your code get
accepted.
18 changes: 18 additions & 0 deletions trunk/Documentation/Changes
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Expand Up @@ -15,6 +15,24 @@ and therefore owes credit to the same people as that file (Jared Mauch,
Axel Boldt, Alessandro Sigala, and countless other users all over the
'net).

The latest revision of this document, in various formats, can always
be found at <http://cyberbuzz.gatech.edu/kaboom/linux/Changes-2.4/>.

Feel free to translate this document. If you do so, please send me a
URL to your translation for inclusion in future revisions of this
document.

Smotrite file <http://oblom.rnc.ru/linux/kernel/Changes.ru>, yavlyaushisya
russkim perevodom dannogo documenta.

Visite <http://www2.adi.uam.es/~ender/tecnico/> para obtener la traducci�n
al espa�ol de este documento en varios formatos.

Eine deutsche Version dieser Datei finden Sie unter
<http://www.stefan-winter.de/Changes-2.4.0.txt>.

Chris Ricker (kaboom@gatech.edu or chris.ricker@genetics.utah.edu).

Current Minimal Requirements
============================

Expand Down
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Expand Up @@ -9,7 +9,7 @@
DOCBOOKS := wanbook.xml z8530book.xml mcabook.xml videobook.xml \
kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
procfs-guide.xml writing_usb_driver.xml \
kernel-api.xml journal-api.xml lsm.xml usb.xml \
sis900.xml kernel-api.xml journal-api.xml lsm.xml usb.xml \
gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml

###
Expand All @@ -28,7 +28,7 @@ PS_METHOD = $(prefer-db2x)

###
# The targets that may be used.
PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs
.PHONY: xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs

BOOKS := $(addprefix $(obj)/,$(DOCBOOKS))
xmldocs: $(BOOKS)
Expand Down Expand Up @@ -211,9 +211,3 @@ clean-dirs := $(patsubst %.xml,%,$(DOCBOOKS))

#man put files in man subdir - traverse down
subdir- := man/


# Declare the contents of the .PHONY variable as phony. We keep that
# information in a variable se we can use it in if_changed and friends.

.PHONY: $(PHONY)
19 changes: 19 additions & 0 deletions trunk/Documentation/DocBook/deviceiobook.tmpl
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Expand Up @@ -270,6 +270,25 @@ CPU B: spin_unlock_irqrestore(&amp;dev_lock, flags)
</para>
</sect1>

<sect1>
<title>ISA legacy functions</title>
<para>
On older kernels (2.2 and earlier) the ISA bus could be read or
written with these functions and without ioremap being used. This is
no longer true in Linux 2.4. A set of equivalent functions exist for
easy legacy driver porting. The functions available are prefixed
with 'isa_' and are <function>isa_readb</function>,
<function>isa_writeb</function>, <function>isa_readw</function>,
<function>isa_writew</function>, <function>isa_readl</function>,
<function>isa_writel</function>, <function>isa_memcpy_fromio</function>
and <function>isa_memcpy_toio</function>
</para>
<para>
These functions should not be used in new drivers, and will
eventually be going away.
</para>
</sect1>

</chapter>

<chapter>
Expand Down
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