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

[Sunny]

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 at 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 at ubuntu: sudo insmod lx.ko
sunny at ubuntu: sudo rmmod lx
sunny at 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 at gmail.com> 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 at gwu.edu>:
> 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 at gmail.com> 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 at 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.
>> 
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20140225/e61aea3f/attachment-0001.html