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Installing CentOs without NetFilter
by Robert Clove Nov. 26, 2013

Nov. 26, 2013

Hi All, Can it be possible to install Centos without installing the Netfilter. Thanks Clove

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How to define function-like macro?
by 乃宏周 Nov. 26, 2013

Nov. 26, 2013

I read manual already: -D name=definition The contents of definition are tokenized and processed as if they appeared during translation phase three in a ‘#define’ directive. In particular, the definition will be truncated by embedded newline characters. If you are invoking the preprocessor from a shell or shell-like program you may need to use the shell's quoting syntax to protect characters such as spaces that have a meaning in the shell syntax. If you wish to define a function-like macro on the command line, write its argument list with surrounding parentheses before the equals sign (if any). Parentheses are meaningful to most shells, so you will need to quote the option. With sh and csh, -D'name(args...)=definition' works. I wrote this in my makefile: *def_dpf = 'dpf(a...)=printk(KERN_ALERT a)'* My code uses `dpf` macro like this: *dpf("current value=%d\n",var);* When I compiling my program, I got this error: *error: ‘Da’ undeclared (first use in this function)* Even manual says *sh* and *csh* can works with that definition, *bash*should support that machanism, I guess. How should I do? Any suggestion?

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How to generate kernel header files like Ubuntu prebuilt standard kernel header files?
by bill4carson Nov. 26, 2013

Nov. 26, 2013

Ubuntu-12.0.4-lts with virtualbox installed building with latest linux kernel tree. When make install, it always spits below error when build virtualbox modules run-parts: executing /etc/kernel/postinst.d/dkms 3.12.0+ /boot/vmlinuz-3.12.0+ ERROR (dkms apport): kernel package linux-headers-3.12.0+ is not supported The Ubuntu system prebuilt kernel header is as below: #ls /usr/src/linux-headers-3.2.0-23 arch block crypto Documentation drivers firmware fs include init ipc Kbuild Kconfig kernel lib Makefile mm net samples scripts security sound tools ubuntu usr virt But the latest kernel headers looks like this, and building virtualbox modules still bad # cd linux-3.12.0 && make headers_install # cat usr/include/ include Can I ask how to generate kernel headers with latest linux kernel tree to successfully build virtualbox modules? thanks -- 八百里秦川尘土飞扬,三千万老陕齐吼秦腔。 --bill

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evaluating boolean kernel param
by devzero＠web.de Nov. 25, 2013

Nov. 25, 2013

Hello, regarding https://bugs.launchpad.net/baltix/+bug/930447 i´m trying to make a simple and tiny kernel patch which let`s you add "fixpae" to the kernel commandline. i`m a rather bad programmer and do not really have a clue about kernel programming, but i think trying to fix this issue at the kernel level, to be included at least in distro`s kernel who ship only pae enabled kernels nowadays is a good approach and chances for inclusion are high - so i thought i give it a try. the mentioned param should 1. make validate_cpu() call being skipped in arch/x86/boot/main.c 2. add "pae" string to the flags line in /proc/cpuinfo The first one was easy - just add one if/else with cmdline_find_option_bool("fixpae") and you´re done. That one actually works, forcing the kernel to boot instead of stopping with a message about missing pae support (which is wrong on some cpu`s). The second one seems a little bit more difficult, i find no example (one that i understand) how to parse a boolean kernel commandline option at "non early boot stage". It seems i cannot use the early commandline parser, so how is that being done in arch/x86/kernel/cpu/proc.c ? regards roland

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How to add '-Dxxx' flags in Makefile?
by 乃宏周 Nov. 25, 2013

Nov. 25, 2013

My makefile of `kpd.ko` is following: ============================ module_name = kpd src_sym = kpd_main a38_kpd util objs = $(addsuffix .o,$(src_sym)) wd = $(shell pwd) EXTRA_CFLAGS+=-DTEST ifneq ($(KERNELRELEASE),) obj-m := $(module_name).o $(module_name)-objs := $(objs) else kver = $(shell uname -r) kd = ../../linux-2.6.32.8 modules: $(MAKE) -C $(kd) M=$(wd) $@ clean: $(MAKE) -C $(kd) M=$(wd) $@ endif ============================= Everything's fine,but I want to add `-DTEST` to EXTRA_CFLAGS. Even if I put $(EXTRA_FLAGS) or other macro into `$(MAKE) -C $(kd) M=$(wd) $@`, Nothing changed in all building process. How should I do to insert `-Dxxx` to original Makefile ?

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Updating the kernel
by Shraddha Kamat Nov. 23, 2013

Nov. 23, 2013

Is it possible to keep the kernel updated to upstream without ever rebooting the system ? Ksplice ?? Regards, Shraddha

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kmap_high calls BUG()
by Ritesh Ranjan Nov. 21, 2013

Nov. 21, 2013

*Sorry for the previous incomplete mail* In highmem.c, the function kmap_high() does the following : BUG_ON(pkmap_count[PKMAP_NR(vaddr)] < 2); Why would this be a " serious bug"? Don't usable entry have pkmap_count[] value as 0. (in map_new_virtual() ) if (!pkmap_count[last_pkmap_nr]) break; How does that work! usable entries have pkmap_count zero but any value less than 2 is a bug!

1 0

kmap_high calls BUG()
by Ritesh Ranjan Nov. 21, 2013

Nov. 21, 2013

In the highmem.c file, the function kmap_high() does the following :

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Need help in printing call stacks for all CPU's
by manty kuma Nov. 21, 2013

Nov. 21, 2013

I wish to print the call stacks of all the cpus. at a given time. How can i do it? for_each_cpu{ dump_stack() -> Some function like this available? or i should write my own code? ... } Any pointers would help. Thank you, Sandeep

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Error message not relevant
by Nav Kamal Nov. 21, 2013

Nov. 21, 2013

Am learning to write LKMs and wrote this program : #include<linux/init.h> #include<linux/module.h> static int module_entry(void){ printk(KERN_ALERT "Hello World !!\n"); return 0; } static void exit_module(void){ printk(KERN_ALERT "Bye World .... \n"); } module_init(module_entry); module_exit(exit_module); In this program if I change return value of function module_entry from 0 to something negative, the module fails to load. The error message is : "insmod: ERROR: could not insert module test.ko: Operation not permitted" Failing to load module with negative return value is understandable but I can't understand why it says "Operation not permitted". Its not about user permissions, its about return value. Can somebody please guide me about this ?

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