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madoka_magika0123456789

Member

Registered: 2024-06-22

Posts: 3

Linux-headers main repo package bad makefiles

Hello,
I need to write a module for Linux  so, following a guide, I installed the linux-headers package and wrote a gnu-makefile for a test module, within it, running make on the /usr/lib/modules/6.9.5-arch1-1/build directory encountered errors, specifically with  ...crypto/Kconfig, the 'source file' that was determined in that file is for an arm version of the system and not an x86 one (see line 1480). I tinkered with it a bit but did not solve the problem, one strange thing i encountered though is that solely changing the string under 'if ARM' to name an x86 directory moved the goalpost to the loongarch architecture right under it, funi.

Pls fix

loqs

Member

Registered: 2014-03-06

Posts: 18,859

Re: Linux-headers main repo package bad makefiles

Are you following building external modules? Please provide the contents of the files you have created and the commands you are using to produce the issue.

madoka_magika0123456789

Member

Registered: 2024-06-22

Posts: 3

Re: Linux-headers main repo package bad makefiles

I am following this pdf: https://sysprog21.github.io/lkmpg/
I had written the makefile by hand but
"cd NEWMODULE_DIR
make -C /lib/modules/6.9.6-arch1-1/build M=$PWM"

encounters the same problem, the full error log:

make: Entering directory '/usr/lib/modules/6.9.6-arch1-1/build'
  SYNC    include/config/auto.conf
  HOSTCC  scripts/kconfig/conf.o
  HOSTCC  scripts/kconfig/confdata.o
  HOSTCC  scripts/kconfig/expr.o
  HOSTCC  scripts/kconfig/lexer.lex.o
  HOSTCC  scripts/kconfig/menu.o
  HOSTCC  scripts/kconfig/parser.tab.o
  HOSTCC  scripts/kconfig/preprocess.o
  HOSTCC  scripts/kconfig/symbol.o
  HOSTCC  scripts/kconfig/util.o
  HOSTLD  scripts/kconfig/conf
crypto/Kconfig:1486: can't open file "arch/arm/crypto/Kconfig"
make[3]: *** [scripts/kconfig/Makefile:85: syncconfig] Error 1
make[2]: *** [Makefile:688: syncconfig] Error 2
make[1]: *** [/usr/lib/modules/6.9.6-arch1-1/build/Makefile:789: include/config/auto.conf] Error 2
make[1]: *** [include/config/auto.conf] Deleting file 'include/generated/rustc_cfg'
make[1]: *** [include/config/auto.conf] Deleting file 'include/generated/autoconf.h'
make: *** [Makefile:240: __sub-make] Error 2
make: Leaving directory '/usr/lib/modules/6.9.6-arch1-1/build'

Sorry for the late reply, I had to check thoroughly for some stupid mistake I might have made lol

Last edited by madoka_magika0123456789 (2024-06-23 12:54:06)

loqs

Member

Registered: 2014-03-06

Posts: 18,859

Re: Linux-headers main repo package bad makefiles

make -C /lib/modules/6.9.6-arch1-1/build M=$PWM"

Should be

make -C /lib/modules/6.9.6-arch1-1/build M=$PWD"

Full example:

$ cat Makefile 
obj-m += hello.o
PWD := $(CURDIR)

all: 
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 

clean: 
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
$ cat hello.c
/*
 * hello-1.c - The simplest kernel module. 
 */

#include <linux/module.h> /* Needed by all modules */ 
#include <linux/printk.h> /* Needed for pr_info() */ 

int init_module(void)
{
    pr_info("Hello world 1.\n"); 
    /* A non 0 return means init_module failed; module can't be loaded. */ 
    return 0;
}


void cleanup_module(void) 
{

    pr_info("Goodbye world 1.\n"); 

}

MODULE_LICENSE("GPL");
$ make -C /lib/modules/6.9.6-arch1-1/build M=$PWD
make: Entering directory '/usr/lib/modules/6.9.6-arch1-1/build'
  CC [M]  /tmp/hello-module/hello.o
/tmp/hello-module/hello.o: warning: objtool: init_module(): not an indirect call target
/tmp/hello-module/hello.o: warning: objtool: cleanup_module(): not an indirect call target
  MODPOST /tmp/hello-module/Module.symvers
  CC [M]  /tmp/hello-module/hello.mod.o
  LD [M]  /tmp/hello-module/hello.ko
  BTF [M] /tmp/hello-module/hello.ko
make: Leaving directory '/usr/lib/modules/6.9.6-arch1-1/build'

madoka_magika0123456789

Member

Registered: 2024-06-22

Posts: 3

Re: Linux-headers main repo package bad makefiles

Things are now somehow working, thank you for the help. Sorry for having made such a concerning thread title out of this lol