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Documentation/BUG-HUNTING whitespace cleanup 

Just a little whitespace cleanup patch for Documentation/BUG-HUNTING

Signed-off-by: Clemens Koller <clemens.koller@anagramm.de>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
This commit is contained in:
Clemens Koller 2008-02-03 16:26:36 +02:00 committed by Adrian Bunk
parent 06c93e8757
commit d81919c9c2
1 changed files with 11 additions and 11 deletions
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Documentation/BUG-HUNTING
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@ -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)] [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. It's a brute force approach but it works pretty well.
You need: You need:
@ -66,12 +66,12 @@ You will then do:
. Rebuild a revision that you believe works, install, and verify that. . Rebuild a revision that you believe works, install, and verify that.
. Do a binary search over the kernels to figure out which one . 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 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 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. 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 . 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 . Narrow it down to a subdirectory
@ -81,27 +81,27 @@ You will then do:
directories: directories:
Copy the non-working directory next to the working directory 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 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 dir.62
mv dir.63 dir mv dir.63 dir
find dir -name '*.[oa]' -print | xargs rm -f find dir -name '*.[oa]' -print | xargs rm -f
And then rebuild and retest. Assuming that all related And then rebuild and retest. Assuming that all related
changes were contained in the sub directory, this should changes were contained in the sub directory, this should
isolate the change to a directory. isolate the change to a directory.
Problems: changes in header files may have occurred; I've 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. or may not want to give up when that happens.
. Narrow it down to a file . Narrow it down to a file
- You can apply the same technique to each file in the directory, - 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 . Narrow it down to a routine
- You can take the old file and the new file and manually create - You can take the old file and the new file and manually create
@ -130,7 +130,7 @@ You will then do:
that makes the difference. that makes the difference.
Finally, you take all the info that you have, kernel revisions, bug 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. 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 A post to linux.dev.kernel isn't such a bad idea if you've done some
work to narrow it down. work to narrow it down.