makefile – 编译错误：内核模块

概述我是一个新手在内核编程&我希望运行这个内核模块(发布在下面)…我运行makefile(发布在下面),但是我收到以下错误：有人可以帮助我了解如何克服这个： 内核程序应该从 Intel’s implementation开始运行错误： obj-m += hello-1.oall:make -C /lib/modules/$(shell uname -r)/build M=$(PWD) module 我是一个新手在内核编程&我希望运行这个内核模块(发布在下面)…我运行makefile(发布在下面),但是我收到以下错误：有人可以帮助我了解如何克服这个：
内核程序应该从 Intel’s implementation开始运行错误：

obj-m += hello-1.oall:make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modulesclean:make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

这是错误：

snehil@ubuntu:~/Desktop/measure$makemake -C /lib/modules/3.0.0-12-generic/build M=/home/snehil/Desktop/measure modulesmake[1]: Entering directory `/usr/src/linux-headers-3.0.0-12-generic'CC [M]  /home/snehil/Desktop/measure/measure1.o/home/snehil/Desktop/measure/measure1.c: In function ‘hello_start’:/home/snehil/Desktop/measure/measure1.c:108:2: error: implicit declaration of function  ‘kmalloc’ [-Werror=implicit-function-declaration]/home/snehil/Desktop/measure/measure1.c:108:8: warning: assignment makes pointer from   integer without a cast [enabled by default]/home/snehil/Desktop/measure/measure1.c:115:11: warning: assignment makes pointer from integer without a cast [enabled by default]/home/snehil/Desktop/measure/measure1.c:124:12: warning: assignment makes pointer from  integer without a cast [enabled by default]/home/snehil/Desktop/measure/measure1.c:130:13: warning: assignment makes pointer frominteger without a cast [enabled by default]cc1: some warnings being treated as errorsmake[2]: *** [/home/snehil/Desktop/measure/measure1.o] Error 1make[1]: *** [_module_/home/snehil/Desktop/measure] Error 2make[1]: Leaving directory `/usr/src/linux-headers-3.0.0-12-generic'make: *** [all] Error 2snehil@ubuntu:~/Desktop/measure$gcc measure1gcc: error: measure1: No such file or directorygcc: Fatal error: no input filescompilation terminated.

这是内核模块代码：

#include <linux/module.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/hardirq.h>#include <linux/preempt.h>#include <linux/sched.h>#define SIZE_OF_STAT 100000#define BOUND_OF_LOOP 1000#define UINT64_MAX (18446744073709551615ulL)voID inline Filltimes(uint64_t **times) {unsigned long flags;int i,j;uint64_t start,end;unsigned cycles_low,cycles_high,cycles_low1,cycles_high1;volatile int variable = 0;asm volatile ("cpuID\n\t""RDTSC\n\t""mov %%edx,%0\n\t""mov %%eax,%1\n\t": "=r" (cycles_high),"=r" (cycles_low)::"%rax","%rbx","%rcx","%rdx");asm volatile ("cpuID\n\t""RDTSC\n\t""cpuID\n\t""RDTSC\n\t""mov %%edx,"=r" (cycles_low):: "%rax","%rdx");asm volatile ("cpuID\n\t""RDTSC\n\t"::: "%rax","%rdx");for (j=0; j<BOUND_OF_LOOP; j++) {for (i =0; i<SIZE_OF_STAT; i++) { variable = 0;preempt_disable();raw_local_irq_save(flags);asm volatile ("cpuID\n\t""RDTSC\n\t""mov %%edx,"%rdx");/*call the function to measure here*/asm volatile("cpuID\n\t""RDTSC\n\t""mov %%edx,%0\n\t" "mov %%eax,%1\n\t": "=r" (cycles_high1),"=r" (cycles_low1):: "%rax","%rdx");raw_local_irq_restore(flags);preempt_enable();start = ( ((uint64_t)cycles_high << 32) | cycles_low );end = ( ((uint64_t)cycles_high1 << 32) | cycles_low1 );if ( (end - start) < 0) {printk(KERN_ERR "\n\n>>>>>>>>>>>>>>  CRITICAL ERROR IN TAKING THE TIME!!!!!!\n loop(%d) stat(%d) start = %llu,end = %llu,variable = %u\n",j,i,start,end,variable);times[j][i] = 0;}else {times[j][i] = end - start;}}}   return;}uint64_t var_calc(uint64_t *inputs,int size){ int i;uint64_t acc = 0,prevIoUs = 0,temp_var = 0;for (i=0; i< size; i++) {if (acc < prevIoUs) goto overflow;prevIoUs = acc;acc += inputs[i];}acc = acc * acc;if (acc < prevIoUs) goto overflow;prevIoUs = 0;for (i=0; i< size; i++){if (temp_var < prevIoUs) goto overflow;prevIoUs = temp_var;temp_var+= (inputs[i]*inputs[i]);} temp_var = temp_var * size;if (temp_var < prevIoUs) goto overflow;temp_var =(temp_var - acc)/(((uint64_t)(size))*((uint64_t)(size))); return (temp_var);overflow:printk(KERN_ERR "\n\n>>>>>>>>>>>>>> CRITICAL OVERFLOW ERROR IN var_calc!!!!!!\n\n");return -EINVAL;}static int __init hello_start(voID){int i = 0,j = 0,spurIoUs = 0,k =0;uint64_t **times;uint64_t *variances;uint64_t *min_values;uint64_t max_dev = 0,min_time = 0,max_time = 0,prev_min =0,tot_var=0,max_dev_all=0,var_of_vars=0,var_of_mins=0;printk(KERN_INFO "Loading hello module...\n");times = kmalloc(BOUND_OF_LOOP*sizeof(uint64_t*),GFP_KERNEL);if (!times) {printk(KERN_ERR "unable to allocate memory for times\n");return 0;}for (j=0; j<BOUND_OF_LOOP; j++) {times[j] = kmalloc(SIZE_OF_STAT*sizeof(uint64_t),GFP_KERNEL);if (!times[j]) {printk(KERN_ERR "unable to allocate memory for times[%d]\n",j);for (k=0; k<j; k++)kfree(times[k]);return 0;}}variances = kmalloc(BOUND_OF_LOOP*sizeof(uint64_t),GFP_KERNEL);if (!variances) {printk(KERN_ERR "unable to allocate memory for variances\n");return 0;}min_values = kmalloc(BOUND_OF_LOOP*sizeof(uint64_t),GFP_KERNEL);if (!min_values) {printk(KERN_ERR "unable to allocate memory for min_values\n");return 0;}Filltimes(times);for (j=0; j<BOUND_OF_LOOP; j++) {max_dev = 0;min_time = 0;max_time = 0;for (i =0; i<SIZE_OF_STAT; i++) {if ((min_time == 0)||(min_time > times[j][i]))min_time = times[j][i];if (max_time < times[j][i])max_time = times[j][i];}max_dev = max_time - min_time;min_values[j] = min_time;if ((prev_min != 0) && (prev_min > min_time))spurIoUs++;if (max_dev > max_dev_all)max_dev_all = max_dev;variances[j] = var_calc(times[j],SIZE_OF_STAT);tot_var += variances[j];printk(KERN_ERR "loop_size:%d >>>> variance(cycles): %llu; max_deviation: %llu ;min  time: %llu",variances[j],max_dev,min_time);prev_min = min_time;}var_of_vars = var_calc(variances,BOUND_OF_LOOP);var_of_mins = var_calc(min_values,BOUND_OF_LOOP);printk(KERN_ERR "\n total number of spurIoUs min values = %d",spurIoUs);printk(KERN_ERR "\n total variance = %llu",(tot_var/BOUND_OF_LOOP));printk(KERN_ERR "\n absolute max deviation = %llu",max_dev_all);printk(KERN_ERR "\n variance of variances = %llu",var_of_vars);printk(KERN_ERR "\n variance of minimum values = %llu",var_of_mins);for (j=0; j<BOUND_OF_LOOP; j++) {kfree(times[j]);}kfree(times);kfree(variances);kfree(min_values);return 0;}static voID __exit hello_end(voID){printk(KERN_INFO "Goodbye Mr.\n");}module_init(hello_start);module_exit(hello_end);

解决方法 如果您使用kmalloc或kzalloc()进行内存分配
您必须包括#include< linux / slab.h&gt ;.
它们被称为slab分配器,这些slab是块,即“cache”
在RAM中并且物理上是连续的.这些slab分配器使用底层
“伙伴系统算法”,好友分配器提供更细粒度的分配.

更多推荐通过以下链接：
http://en.wikipedia.org/wiki/Slab_allocation
http://en.wikipedia.org/wiki/Buddy_algorithm

希望这回答你的问题!!!!!

总结

以上是内存溢出为你收集整理的makefile – 编译错误：内核模块全部内容，希望文章能够帮你解决makefile – 编译错误：内核模块所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。