Hi, folks. With the aid of Jonathan's and Philipp's excellent instructions I was able to rebuild the Debian Wheezy 3.2 kernel with the NSS feature enabled.
As I have begun to experiment with building the kernel, I have found the following issues with the Debian process 1) If I install the libncurses5-dev package and use the instructions found in Chapter 4, Section 5 of the Debian Linux Kernel Handbook (i.e., the make menuconfig, make clean, make deb-pkg steps), the kernel built is for the s390 architecture and not the s390x one. 2) If I use the "make menuconfig" command instead of the two "scripts/config" commands shown below, then the next "fakeroot make -f debian/rules.gen binary-arch_s390x_none_s390x" command fails with an error. That is the following sequence does not work: cd linux-3.2.23 fakeroot make -f debian/rules.gen setup_s390x_none_s390x make menuconfig fakeroot make -f debian/rules.gen binary-arch_s390x_none_s390x 3) Since it appears that I can not use the "make menuconfig" process to update the kernel configuration file, where might I find a list of all acceptable options for the "scripts/config --enable" command 4) Why is the kernel build process for s390x different than the one documented in the Handbook? Thanks again for the help, and have a good one, too. DJ On 10/25/2012 05:17 PM, Philipp Kern wrote: > Hi, > > On Tue, Oct 23, 2012 at 08:45:25PM -0700, Jonathan Nieder wrote: >> Dave Jones wrote: >>> Can the wheezy s390x kernel be saved as an NSS? If so, how? >> Based on [1], it looks like the answer is currently no, based on the >> following line in the kernel config file: >> >> # CONFIG_SHARED_KERNEL is not set >> >> The description of that option says >> >> Select this option, if you want to share the text segment of the >> Linux kernel between different VM guests. This reduces memory >> usage with lots of guests but greatly increases kernel size. >> >> You can build a custom kernel using that option if you wish. It works >> like this[2]: >> >> $ apt-get source linux >> # apt-get install build-essential fakeroot >> # apt-get build-dep linux >> $ cd linux-<version> >> $ fakeroot debian/rules source >> $ fakeroot make -f debian/rules.gen setup_s390_none_s390x > > as we're talking about s390x here that would be setup_s390x_none_s390x. > >> $ cd debian/build/build_s390_none_s390x > > Same here. > >> $ scripts/config --disable DEBUG_INFO >> $ scripts/config --enable SHARED_KERNEL > > That's «../source_none/scripts/config». > >> $ cd ../../.. >> $ fakeroot make -f debian/rules.gen binary-arch_s390_none_s390x > > And again s390x_none_s390x instead of s390_none_s390x. > > I just did the recompilation. AFAICS the kernel size is indeed increased quite > a bit. We currently have: > > -rw-r--r-- root/root 6303232 2012-10-22 15:36 ./boot/vmlinuz-3.2.0-4-s390x > > With SHARED_KERNEL on and DEBUG_INFO off as above: > > -rw-r--r-- root/root 7945728 2012-10-25 21:53 ./boot/vmlinuz-3.2.0-4-s390x > > So a NSS shareable kernel is 1.26 times larger than a plain one. And I fear > that the additional bits cannot be discarded at runtime neither, but I cannot > test this right now. > > Interestingly enough the kernel is already in its plain form 2.23 times bigger > than an amd64 build of vmlinuz-3.2.0-3-amd64. > > Kind regards > Philipp Kern > >> [1] http://www.vm.ibm.com/linux/linuxnss.html >> [2] http://kernel-handbook.alioth.debian.org/ch-common-tasks.html > -- Dave Jones V/Soft Software www.vsoft-software.com Houston, TX 281.578.7544 -- To UNSUBSCRIBE, email to debian-s390-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/50982d49.1000...@vsoft-software.com
