Re: simple (and probably trivial) git question about cumulative patches

On 10/31/2007 09:57 AM, Ramagudi Naziir wrote:

> On 10/31/07, Rene Herman <rene.herman <at> keyaccess.nl> wrote:

>> Quilt is tool to manage a stack of patches. You push and pop patches
>> and there's always one on top. I've used it a while, but did not find
>> it to be very handy for managing trees you do actual development in.
>> Working on anything but the patch on top of the stack is somewhere
>> between impossible and ill adviced with it, and I frequently found
>> myself realizing I needed to work on earlier patches a bit more. You
>> then have to pop everything that's on top, work, commit, push all the
>> others again (and suffering maybe massive recompiles due to touching
>> many files...) and so on.
> 
> This is the same problem I have with git (I have never tried quilt). How
> can you work an an earlier patch in git ? I also do exactly what you said
> - I pop everything on top... work.. commit.. push back all others... do
> you have a way to do this otherwise using git ?

Well, firstly, I use seperate branches for most anything. My master branch 
tracks linus' tree but I'm only on that branch when I want to upgrade to a 
new upstream which I don't do daily or anything. I branch off for anything 
conceptually seperate and have a "local" branch that pulls in all the other 
branches that contains work I want to compile, and which generates the 
kernel I run.

I usually branch of at a full release:

	<at the master branch>
	git branch foo v2.6.23

scull driver from ldd3 book , insmod , error

Re: scull driver from ldd3 book , insmod , error

Iman Darabi spiffera, alle Thursday 01 November 2007 circa:
> i got scull driver from http://examples.oreilly.com/linuxdrive3/
> it needs linux-2.6.10 , but i've gentoo with linux-2.6.22.9 ( and gcc
> version 4.1.1 )
>
> so i used 2.6.10 header files to compile scull like this :

No, you must compile it against a 2.6.22 kernel, so you have to:
- download the 2.6.22 version sources, 
- modify the makefile in order to point to the right sources.
- try to compile it again ;)

bye!
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running ide driver in the polling mode

Accessing PCMCIA device registers.

Hello all,

    I have a doubt regarding the difference between I/O Ports and I/O 
Memory. I'm reading through LDD3 and it says I/O ports are consecutive 
address in either memory address space or I/O address space through 
which device registers can be accessed  and I/O memory is a region of 
RAM that the device makes available to the processor over the bus. I 
would like to know as to which are the devices using I/O Ports and which 
are the devices using I/O memory and why.

     I'm trying to write a device driver for PCMCIA MC315+ data card on 
i386 platform for kernel 2.6.18. I'm trying to access the Local 
Configuration Registers made available by the device. By reading the CIS 
from the device i am able to get address of I/O Space. Can someone tell 
the kind of I/O access used for accessing these registers.

Thanks for your help.
Surej

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Re: Does kernel 2.6.20.3 have any apparmor module?

On Tue, Oct 30, 2007 at 10:56:59PM -0400, hxsrmeng wrote:
> Hi friends,
> 
> I am building a 2.6.20.3 kernel on an openSUSE 10.2. I cannot find the
> apparmor in the kernel's configuration file. 

That is because apparmor is not part of the main linux kernel tree.

> When boot with the new kernel, it shows that it's failed to load
> apparmor module. I try to pass capabilities.disable=1 to the booting
> command line. It doesn't work, there is no apparmor module to load.
> 
> Do I need to apply a patch? May I use the kernel patch at the website:
> http://forgeftp.novell.com//apparmor/LKML_Submission-June-07/ ?
> 
> or the kernel-patch-mm at
> http://forge.novell.com/modules/xfmod/project/?apparmor ?

If you want to have it in your kernel, yes, you are going to have to
apply some kind of patch.

thanks,

greg k-h

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can a git commit have more than two parents?

  reading the git user manual, and i'm curious about the phrasing that
a commit might have more than one parent if that commit represents a
merge.  sure, it's obvious that it would have *two* parents, but why
doesn't the text just say that?  can there be *more* than two parents
for a commit operation?  or for any other operation?  thanks.

rday

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Linux Consulting, Training and Annoying Kernel Pedantry
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http://crashcourse.ca
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Re: scull driver from ldd3 book , insmod , error

Device driver in I/O architecture

problem in read operations - inconsistency

Hi All,

My system configuration is   :
Arch : ppc7400
kernel : 2.6.21
Memory : 512MB.
Filesystem : XFS

I am facing a strange problem !

When i do a read operation on a large file,  i am not getting the 
expected data (ie., it reads wrong data).

I  have written a simple read & write program, where it does the 
following :

1.allocate a buffer of 314MB
2.memset it to '5'
3.write this buffer to a file
4.fsync the file
5.close the file
6.open the same file
7.read the contents in chunksize of 4k into a buffer.
8.check the contents for '5'
    Here i am supposed to get only '5's, but i get some different value 
after some reads.

The interesting thing here is :  If i open the file with O_DIRECT, i 
don't see such inconsistency.

Due to this inconsistency, i am not able to untar a large file (600MB) 
properly. In the middle of untarring i get "Invalid headers".  Copy 
operations are also not happening properly, get "Structure needs 
cleanining" in the middle of copy. Even the compare on two same files 
shows me differences.

I guess all the above inconsistency is due to the "buffered read path". 
Some thing goes wrong in the flow of buffered reads.
I have checked the buffer inside the "do_generic_mapping_read" function 
(ie., before the copy_to_user ), even here there is inconsistency.

I checked the memory with memtest, and harddisk with smartmon tools, 
found no errors here. Also same problem is reproduced on different m/c's 
with similar configuration.

Is this a bug in kernel-2.6.21-PPC?
Please help me on finding out the problem.

Thanks
Ashok

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