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 [off-list ref] 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.

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