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@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@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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