Re: [kernel]which the file define the variable of "phys_base"?

[Sunny <sundarcs@xxxxxxx>]

It didn’t show me anything like that. It worked well. Here is what I have - note that I changed couple of things in printk statement but that shouldn’t affect your errors:

__________________________________________________

Program - lx.c

#include <linux/module.h>               // for printk()

#include <linux/mm.h>             // for struct page

#include <asm/page.h>             // for struct page

#include <asm/pgtable.h>                // for ZERO_PAGE

static int __init init_hello( void )

{

        int i;

        struct page * zero_page;

        printk(KERN_ALERT "\n   Kello, the first! \n\n" );

        i = 0x100;

        zero_page = ZERO_PAGE(&i);

        printk(KERN_ALERT " the ZERO address is %p", zero_page);

        return  0;

}

static void __exit exit_hello( void )

{

        printk(KERN_ALERT "\n   Goodbye now... \n\n" );

}

MODULE_LICENSE("GPL");

module_init(init_hello);

module_exit(exit_hello);

Makefile

obj-m :=lx.o

KDIR= /lib/modules/$(shell uname -r)/build

all:

$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

clean:

rm -rf $(wildcard *.o *.ko mo* Mo* *.mod.c)

____________________________________________________

Running make gives me(I’m in a Virtual Machine so the page addresses may be messed up):

sunny@ubuntu: make

make -C /lib/modules/3.11.0-12-generic/build SUBDIRS=/home/sunny/Documents/ modules

make[1]: Entering directory `/usr/src/linux-headers-3.11.0-12-generic'

  Building modules, stage 2.

  MODPOST 1 modules

make[1]: Leaving directory `/usr/src/linux-headers-3.11.0-12-generic'

sunny@ubuntu: sudo insmod lx.ko

sunny@ubuntu: sudo rmmod lx

sunny@ubuntu: sudo dmesg | tail -6

[48391.359434]    Kello, the first! 

[48391.359434] 

[48320.368773]  the ZERO address is ffffea0000079b40

[48391.359439]  the ZERO address is ffffea0000079b40<1>[48411.409906] 

[48411.409906]    Goodbye now... 

[48411.409906] 

Hope this helps! Don’t forget to ‘reply all’ so that others in the mailing list could also see your/my problem/solution.

- Sunny

On Feb 24, 2014, at 7:32 PM, lx <lxlenovostar@xxxxxxxxx> wrote:

hi :

    If i command the "insmod zero.ko"; the wrong messages is:

##############

insmod: error inserting 'zero.ko': -1 Unknown symbol in module

##############

2014-02-25 2:33 GMT+08:00 Sunny <sundarcs@xxxxxxx>:

Hi,

I’m not sure about the “pays_base” warning, but your code runs fine in my machine. What happens if you ignore the warning and load the module anyway?

- Sunny

On Feb 24, 2014, at 9:04 AM, lx <lxlenovostar@xxxxxxxxx> wrote:

hi all:

      the codes is:

#########################################

#include <linux/module.h>               // for printk()

#include <linux/mm.h>             // for struct page

#include <asm/page.h>             // for struct page

#include <asm/pgtable.h>                // for ZERO_PAGE

static int __init init_hello( void )

{

        int i;

        struct page * zero_page;

        printk( "\n   Kello, the first! \n\n" );

        i = 0x100;

        zero_page = ZERO_PAGE(&i);

        printk(" the ZERO address is %p", zero_page);

        return  0;

}

static void __exit exit_hello( void )

{

        printk( "\n   Goodbye now... \n\n" );

}

MODULE_LICENSE("GPL");

module_init(init_hello);

module_exit(exit_hello);

#########################################

I complier it. by:

#########################################

make -C /lib/modules/`uname -r`/build M=`pwd`

#########################################

the results is:

#########################################

[root@localhost kernel_test]# make -C /lib/modules/`uname -r`/build M=`pwd`

make: Entering directory `/usr/src/kernels/2.6.18-308.el5-x86_64'

  CC [M]  /opt/lx/kernel/kernel_test/zero.o

  Building modules, stage 2.

  MODPOST

WARNING: "phys_base" [/opt/lx/kernel/kernel_test/zero.ko] undefined!

  LD [M]  /opt/lx/kernel/kernel_test/zero.ko

make: Leaving directory `/usr/src/kernels/2.6.18-308.el5-x86_64'

#########################################

I try to find the file which defined the "phys_base", for examples;

phys_base

Defined as a variable in:

• arch/sparc/mm/init.c, line 40
• arch/sparc64/kernel/sparc64_ksyms.c, line 110
• arch/sparc64/mm/init.c, line 47
• include/asm-sparc/page.h, line 160
• include/asm-sparc/pgtable.h, line 122
• include/asm-sparc64/pgtable.h, line 227

But I can't find the file of init.c in my computer. Please tell me some ways to solve it, thank you.

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