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I use kmalloc,but an error occurs,Can anyone help
me?
I use kmalloc in modules named "main.c"like
this:
# define __KERNEL__
#endif #ifndef MODULE # define MODULE #endif #include <linux/module.h> #include <linux/version.h> #include <linux/kernel.h> /* printk() */ #include <linux/malloc.h> /* kmalloc() */ int init_module(void) { printk("init-module"); kmalloc(1024,GFP_KERNEL); } void cleanup_module(void) { printk("cleanup_module"); } when I gcc -c main.c
the compiler says:
main.c: In function `init_module':
main.c:20: `GFP_KERNEL' undeclared (first use in this function) main.c:20: (Each undeclared identifier is reported only once main.c:20: for each function it appears in.) I don't know why
then i check my /usr/include/linux/kernel.h,the
content look like this:
#ifndef _LINUX_KERNEL_H
#define _LINUX_KERNEL_H /*
* 'kernel.h' contains some often-used function prototypes etc */ #define SI_LOAD_SHIFT 16
struct sysinfo { long uptime; /* Seconds since boot */ unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ unsigned long totalram; /* Total usable main memory size */ unsigned long freeram; /* Available memory size */ unsigned long sharedram; /* Amount of shared memory */ unsigned long bufferram; /* Memory used by buffers */ unsigned long totalswap; /* Total swap space size */ unsigned long freeswap; /* swap space still available */ unsigned short procs; /* Number of current processes */ unsigned short pad; /* explicit padding for m68k */ unsigned long totalhigh; /* Total high memory size */ unsigned long freehigh; /* Available high memory size */ unsigned int mem_unit; /* Memory unit size in bytes */ char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ }; #endif
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