Realtime kernel build quickie + bootsplash (or not)

[Hadret]

So, I made few tests and definitely X.org doesn't start with Realtime-Prempt patch - without it, all works just fine

[Red-guy]

For those interested in the bootsplash ....
http://www.patroclo7.org/zenwalk/bootsp ... .6.25.diff

Good luck...I am using it.

[Scoop]

Hi and thanks for updating this guide..

I am trying to build 2.6.25.4 realtime kernel with rt6 patch.
I am building 32-bit kernel on dual-core 64bit system (already got a 64bit partition with working rt kernel).
I have tried several times but cannot get any modules built. When I boot into the new kernel it boots ok but lsmod shows no modules.

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norv@sid32:~$ uname -a
Linux sid32 2.6.25.4-rt6 #1 SMP PREEMPT RT Fri Jun 13 16:45:28 EST 2008 i686 GNU/Linux
norv@sid32:~$ lsmod
Module                  Size  Used by
norv@sid32:~$ ls /lib/modules
2.6.24-1-686  2.6.25-2-686  2.6.25.4-rt6
norv@sid32:~$ ls /lib/modules/2.6.25-2-686/kernel
arch  crypto  drivers  fs  lib  net  sound
norv@sid32:~$ ls /lib/modules/2.6.25.4-rt6/kernel
drivers
norv@sid32:~$


I am running export CONCURRENCY_LEVEL=2 before any make commands and following the howto word by word.
Any ideas?

[mzilikazi]

When I boot into the new kernel it boots ok but lsmod shows no modules.

One way this could happen would be if you had built all of your required drivers directly into the kernel and not as modules.

Are certain pieces of hardware failing?

[Scoop]

Sound is not working with compiled rt6 kernel but is working with 2.6.25-2 kernel from sid.
But both kernels see my iPod automatically when I plug it in via USB.
lspci sees the soundcard.

What I did:
installed recent lenny businesscard iso and installed base system over net.
Changed lenny to sid in /etc/apt/sources.list
Ran aptitude update, dist-upgrade.
Installed Desktop Environment with tasksel.
Then followed your excellent howto, but used rt6 patch as that is most recent.

Possibilities:
*tasksel did not get all necessary packages, eg. basic pkgs like eog and gedit were not automatically installed by tasksel. But I am running tasksel 2.74.2
*The mirror I'm using doesn't have all packages. (I tried another mirror, no change.)
*The 'make modules' part of make-kpkg is failing.

I added stable and testing entries to sources.list and updated and upgraded but no extra (missing) packages were found.

[Scoop]

I might reinstall and do tasksel and compile from lenny b4 upgrade to sid.

[max]

Nvidia graphics driver:
You might want to disable Paravirtualization in make menuconfig. The Nvidia driver does not build against kernels with this enabled.

how? I can't find it in menuconfig

EDIT: I've build the kernel but when starting I''get

BUG: using smpreprocessor-id () in preempt [0000000] code: khelper/1012

or something...

@mzilikazi
Can't I use a kernel made by you? I need to build a nvidia driver too...

[alidh]

I ve build the kernel. Everything seems to went fine.

When I boot the kernel I get:

BUG: using smp_processor_id () in preeemtible [00000000] code khelper/1012


When I want to build my rt2500 driver for my wireless connection I'll get:

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touch config.mk \
      && /usr/bin/make clean
make[1]: Map '/usr/src/modules/rt2500' wordt binnengegaan
make[1]: Map '/usr/src/modules/rt2500' wordt verlaten
dh_clean
/usr/bin/make  -f debian/rules kdist_clean kdist_config binary-modules
make[1]: Map '/usr/src/modules/rt2500' wordt binnengegaan
touch config.mk \
      && /usr/bin/make clean
make[2]: Map '/usr/src/modules/rt2500' wordt binnengegaan
make[2]: Map '/usr/src/modules/rt2500' wordt verlaten
dh_clean
for templ in ; do \
    cp $templ `echo $templ | sed -e 's/_KVERS_/2.6.25.4-rt3/g'` ; \
  done
for templ in `ls debian/*.modules.in` ; do \
    test -e ${templ%.modules.in}.backup || cp ${templ%.modules.in} ${templ%.modules.in}.backup 2>/dev/null || true; \
    sed -e 's/##KVERS##/2.6.25.4-rt3/g ;s/#KVERS#/2.6.25.4-rt3/g ; s/_KVERS_/2.6.25.4-rt3/g ; s/##KDREV##/mz1/g ; s/#KDREV#/mz1/g ; s/_KDREV_/mz1/g  ' < $templ > ${templ%.modules.in}; \
  done
# Install module
dh_installdirs lib/modules/2.6.25.4-rt3/kernel/drivers/net/wireless
# Build modules
/usr/bin/make KERNDIR=/lib/modules/2.6.25.4-rt3/source PATCHLEVEL=6
make[2]: Map '/usr/src/modules/rt2500' wordt binnengegaan
make[3]: Map '/home/d/KERNEL/linux-2.6.25.4-rt3' wordt binnengegaan
  CC [M]  /usr/src/modules/rt2500/rtmp_main.o
/usr/src/modules/rt2500/rtmp_main.c: In function ‘RT2500_probe’:
/usr/src/modules/rt2500/rtmp_main.c:327: error: ‘struct net_device’ has no member named ‘wireless_handlers’
make[4]: *** [/usr/src/modules/rt2500/rtmp_main.o] Fout 1
make[3]: *** [_module_/usr/src/modules/rt2500] Fout 2
make[3]: Map '/home/d/KERNEL/linux-2.6.25.4-rt3' wordt verlaten
rt2500.ko failed to build!
make[2]: *** [module] Fout 1
make[2]: Map '/usr/src/modules/rt2500' wordt verlaten
make[1]: *** [binary_modules] Fout 2
make[1]: Map '/usr/src/modules/rt2500' wordt verlaten
make: *** [kdist_build] Fout 2


[alidh]

Tried to download the prepatched kernel 25.4-rt3
The duration of the building process was about 10 minuts. I didn't seems to have wireless drivers included....





tried 24.7-rt7 building took a lot more time, but it works very badly..

When booting: fails such and so and he didn't recognize the /root system or so...

He don't recognize /dev/hda2 as ext2 file system... but the other kernels do :/

warnings when building:

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/keywords.c
  HOSTCC  scripts/genksyms/lex.o
scripts/genksyms/lex.c:1487: warning: ‘input’ defined but not used
  SHIPPED scripts/genksyms/parse.c
 

C      mm/highmem.o
  CC      mm/madvise.o
  CC      mm/memory.o
  CC      mm/mincore.o
  CC      mm/mlock.o
  CC      mm/mmap.o
mm/mmap.c: In function ‘insert_vm_struct’:
mm/mmap.c:2070: warning: ‘rb_parent’ may be used uninitialized in this function
mm/mmap.c:2070: warning: ‘rb_link’ may be used uninitialized in this function
mm/mmap.c:2069: warning: ‘prev’ may be used uninitialized in this function
mm/mmap.c: In function ‘copy_vma’:
mm/mmap.c:2109: warning: ‘rb_parent’ may be used uninitialized in this function
mm/mmap.c:2109: warning: ‘rb_link’ may be used uninitialized in this function
mm/mmap.c:2108: warning: ‘prev’ may be used uninitialized in this function
mm/mmap.c: In function ‘do_brk’:
mm/mmap.c:1936: warning: ‘rb_parent’ may be used uninitialized in this function
mm/mmap.c:1936: warning: ‘rb_link’ may be used uninitialized in this function
mm/mmap.c:1934: warning: ‘prev’ may be used uninitialized in this function
mm/mmap.c: In function ‘mmap_region’:
mm/mmap.c:1076: warning: ‘rb_parent’ may be used uninitialized in this function
mm/mmap.c:1076: warning: ‘rb_link’ may be used uninitialized in this function
mm/mmap.c:1073: warning: ‘prev’ may be used uninitialized in this function
  CC      mm/mprotect.o


LD      fs/ocfs2/cluster/built-in.o
  LD      fs/ocfs2/dlm/built-in.o
  CC      fs/partitions/check.o
fs/partitions/check.c: In function ‘add_partition’:
fs/partitions/check.c:393: warning: ignoring return value of ‘kobject_add’, declared with attribute warn_unused_result
fs/partitions/check.c:396: warning: ignoring return value of ‘sysfs_create_link’, declared with attribute warn_unused_result
fs/partitions/check.c:403: warning: ignoring return value of ‘sysfs_create_file’, declared with attribute warn_unused_result
  CC      fs/partitions/acorn.o

      drivers/acpi/tables/tbfadt.o
drivers/acpi/tables/tbfadt.c: In function ‘acpi_tb_create_local_fadt’:
include/asm/string_32.h:65: warning: array subscript is above array bounds
  LD      drivers/acpi/tables/built-in.o

CC      drivers/pci/pci.o
  CC      drivers/pci/quirks.o
  CC      drivers/pci/pci-driver.o
  CC      drivers/pci/search.o
drivers/pci/search.c: In function ‘pci_find_slot’:
drivers/pci/search.c:135: warning: ‘pci_find_device’ is deprecated (declared at include/linux/pci.h:493)
drivers/pci/search.c: At top level:
drivers/pci/search.c:478: warning: ‘pci_find_device’ is deprecated (declared at drivers/pci/search.c:283)
drivers/pci/search.c:478: warning: ‘pci_find_device’ is deprecated (declared at drivers/pci/search.c:283)
drivers/pci/search.c:479: warning: ‘pci_find_slot’ is deprecated (declared at drivers/pci/search.c:132)
drivers/pci/search.c:479: warning: ‘pci_find_slot’ is deprecated (declared at drivers/pci/search.c:132)
  CC      drivers/pci/pci-sysfs.o
  CC      drivers/pci/rom.

CC [M]  arch/x86/kernel/apm_32.o
arch/x86/kernel/apm_32.c: In function ‘suspend’:
arch/x86/kernel/apm_32.c:1192: warning: ‘pm_send_all’ is deprecated (declared at include/linux/pm_legacy.h:16)
arch/x86/kernel/apm_32.c:1227: warning: ‘pm_send_all’ is deprecated (declared at include/linux/pm_legacy.h:16)
arch/x86/kernel/apm_32.c: In function ‘check_events’:
arch/x86/kernel/apm_32.c:1340: warning: ‘pm_send_all’ is deprecated (declared at include/linux/pm_legacy.h:16)

CC [M]  fs/afs/dir.o
fs/afs/dir.c: In function ‘afs_d_revalidate’:
fs/afs/dir.c:566: warning: ‘fid.vnode’ may be used uninitialized in this function
fs/afs/dir.c:566: warning: ‘fid.unique’ may be used uninitialized in this function
  CC [M]  fs/afs/file.o


EDIT: is this tutorial for experienced kernel builders or can anyone just follow the steps?

Edit: 23.9-rt12 fails to build

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LD      init/built-in.o
  LD      .tmp_vmlinux1
kernel/built-in.o: In function `getnstimeofday':
(.text+0x1f1d0): undefined reference to `__umoddi3'
kernel/built-in.o: In function `do_gettimeofday':
(.text+0x1f2be): undefined reference to `__udivdi3'
kernel/built-in.o: In function `do_gettimeofday':
(.text+0x1f2e1): undefined reference to `__umoddi3'
kernel/built-in.o: In function `timekeeping_resume':
timekeeping.c:(.text+0x1f421): undefined reference to `__udivdi3'
timekeeping.c:(.text+0x1f444): undefined reference to `__umoddi3'
kernel/built-in.o: In function `update_wall_time':
(.text+0x1fbb1): undefined reference to `__udivdi3'
kernel/built-in.o: In function `update_wall_time':
(.text+0x1fbd4): undefined reference to `__umoddi3'
kernel/built-in.o: In function `update_wall_time':
(.text+0x1fc76): undefined reference to `__udivdi3'
kernel/built-in.o: In function `update_wall_time':
(.text+0x1fc99): undefined reference to `__umoddi3'
make[1]: *** [.tmp_vmlinux1] Fout 1
make[1]: Map '/home/d/KERNEL/linux-2.6.23.9-rt12' wordt verlaten
make: *** [debian/stamp-build-kernel] Fout 2

real    8m3.863s
user    6m42.849s
sys     1m1.300s


SHOOT!!!!!!

[alidh]

Tried a new one 25.8-rt7

errors which i don't get with the normal kernel

http://pastebin.com/m5bc649d

[getdf]

Hi

Is there one patch for linux-2.6.22.1.tar.bz2 ?

[garrincha]

Hi

Is there one patch for linux-2.6.22.1.tar.bz2 ?

You need to look under "older" directory:
http://www.kernel.org/pub/linux/kernel/ ... /rt/older/

There is also a bootsplash patch for it as well:
http://fatcat.ftj.agh.edu.pl/~przyboro/ ... ootsplash/

[getdf]

There is not patch-2.6.22.1-rtx.bz2

can i use patch-2.6.22.1-rtx-broken-out.tar.bz2 ???

[garrincha]

There is not patch-2.6.22.1-rtx.bz2

can i use patch-2.6.22.1-rtx-broken-out.tar.bz2 ???

http://itmaze.com.au/articles/linux-tin ... t_vs_patch

[mzilikazi]

I decided to write the latest RT kernel howto a little differently since it doesn't exactly follow the same procedure as the last one and I thought it would be good to have both howto's in place. If you want 2.6.26.5-rt8 read on. All of this is done as user!

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mkdir KERNEL
cd KERNEL
wget http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.26.5.tar.bz2
wget http://jenggo.net/donlod/bootsplash-3.1.6-2.6.26.diff.tar.gz
wget http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.26.5-rt8.gz
unp linux-2.6.26.5.tar.bz2
unp bootsplash-3.1.6-2.6.26.diff.tar.gz
mv linux-2.6.26.5 linux-2.6.26.5-rt8
cd linux-2.6.26.5-rt8
patch -p1 <../bootsplash-3.1.6-2.6.26.diff
zcat ../patch-2.6.26.5-rt8.gz |patch -p1

Note the Makefile in your kernel source. It will automatically update the EXTRAVERSION string for you. In this case:

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VERSION = 2
PATCHLEVEL = 6
SUBLEVEL = 26
EXTRAVERSION = .5-rt8
NAME = Rotary Wombat

This will be appended to your kernel name.

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make menuconfig

OR if you wish to start with the same .config of your current kernel:

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make oldconfig

Then run

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make menuconfig

Enable Real-time preemption.

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Processor type and features> Preemption Mode (Complete Preemption (Real-Time))

Set kernel timer frequency to 1000 HZ

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Processor type and features>Timer frequency (1000 HZ)

Build a kernel the Debian way:

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make-kpkg clean
time fakeroot make-kpkg --initrd -rev mz1 kernel_image kernel_headers

Your new kernel & headers now live in ../KERNEL Use dpkg -i to install.

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$ dpkg -i ../linux-headers-*.deb ../linux-image-*.deb

*TIPS*
Dual core CPU?
Use paralell make processes:

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export CONCURRENCY_LEVEL=2

Skip the patches.
You can just skip the realtime patch and/or the bootsplash patch(es) all together for a basic kernel build. No need to apply either patch.

Nvidia graphics driver:
You might want to disable Paravirtualization in make menuconfig. The Nvidia driver does not build against kernels with this enabled.

You can build the nvidia-kernel driver (or any other drivers like ndiswrapper or rfswitch) before you even boot into your new kernel if you prefer but it must be done as root. You must be in the same dir as your kernel source.

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apt-get update;apt-get install nvidia-kernel-source

Nvidia 173.14.09-5 doesn't play nice with the latest RT patch. If you try to build nvidia it will fail something like this:

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/usr/src/modules/nvidia-kernel/nv.c:1887: error: implicit declaration of function ‘__SEMAPHORE_INITIALIZER’
/usr/src/modules/nvidia-kernel/nv.c:1887: error: invalid initializer
/usr/src/modules/nvidia-kernel/nv.c: In function ‘nv_lock_init_locks’:
/usr/src/modules/nvidia-kernel/nv.c:3783: error: invalid initializer
/usr/src/modules/nvidia-kernel/nv.c:3784: error: invalid initializer
make[4]: *** [/usr/src/modules/nvidia-kernel/nv.o] Error 1
make[3]: *** [_module_/usr/src/modules/nvidia-kernel] Error 2
make[3]: Leaving directory `/home/glenn/KERNEL/linux-2.6.26.5-rt8'
NVIDIA: left KBUILD.
nvidia.ko failed to build!
make[2]: *** [module] Error 1
make[2]: Leaving directory `/usr/src/modules/nvidia-kernel'
make[1]: *** [build-stamp] Error 2
make[1]: Leaving directory `/usr/src/modules/nvidia-kernel'
make: *** [kdist_image] Error 2
BUILD FAILED!
See /var/cache/modass/nvidia-kernel-source.buildlog.2.6.26.5-rt8.1221183345 for details.
Build failed. Press Return to continue...

Fortunately, it's not too difficult to work around.

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apt-get update;apt-get install nvidia-kernel-source
sed -i '/__SEMAPHORE_INITIALIZER/ s/__SEMAPHORE_INITIALIZER/__COMPAT_SEMAPHORE_INITIALIZER/' /usr/src/modules/nvidia-kernel/nv-linux.h
sed -i '/struct semaphore/ s/struct semaphore/struct compat_semaphore/' /usr/src/modules/nvidia-kernel/nv-linux.h

If you run your usual m-a line for nvidia it will unpack the source again and your edits to nv-linux.h will be wasted. Lucky for us m-a has a workaround for this too in the form of the -O switch.

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man m-a

/snip/

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-O

       --not-unpack
              Never unpack the source tarball. Usefull after manual manipulation of module source.


Just put that switch right in front of the module you wish to build like so:

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m-a -t -k linux-2.6.26.5-rt8/ -l linux-2.6.26-5-rt8 a-b -O nvidia