使用ARM GCC工具链可以很好地构建这个内核..出于某种原因,aarch64工具链会抛出此错误。
kernel/sched/core_ctl.c: In function 'cpufreq_gov_cb':
kernel/sched/core_ctl.c:1086:25: error: dereferencing pointer to incomplete type
core_ctl_set_busy(info->cpu, info->load);
^
kernel/sched/core_ctl.c:1086:36: error: dereferencing pointer to incomplete type
core_ctl_set_busy(info->cpu, info->load);
^
scripts/Makefile.build:257: recipe for target 'kernel/sched/core_ctl.o' failed
这是" cpu"已定义(无法在c文件中找到负载):
#include <linux/init.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/cpufreq.h>
#include <linux/timer.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/sched/rt.h>
#include <linux/mutex.h>
#include <trace/events/sched.h>
#define MAX_CPUS_PER_GROUP 4
struct cpu_data {
/* Per CPU data. */
bool inited;
bool online;
bool rejected;
bool is_busy;
bool not_preferred;
unsigned int busy;
unsigned int cpu;
struct list_head sib;
unsigned int first_cpu;
struct list_head pending_sib;
/* Per cluster data set only on first CPU */
unsigned int min_cpus;
unsigned int max_cpus;
unsigned int offline_delay_ms;
unsigned int busy_up_thres[MAX_CPUS_PER_GROUP];
unsigned int busy_down_thres[MAX_CPUS_PER_GROUP];
unsigned int online_cpus;
unsigned int avail_cpus;
unsigned int num_cpus;
unsigned int need_cpus;
unsigned int task_thres;
s64 need_ts;
struct list_head lru;
bool pending;
spinlock_t pending_lock;
bool is_big_cluster;
int nrrun;
bool nrrun_changed;
struct timer_list timer;
struct task_struct *hotplug_thread;
struct kobject kobj;
struct list_head pending_lru;
bool disabled;
};
什么可以使编译器报告不完整类型?我对C中的指针和结构不太熟悉,但是无法解决这个问题。
答案 0 :(得分:0)
在您的计算机上编译kernel / sched / core_ctl.c时,似乎缺少struct cpufreq_govinfo的头文件。
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在我的机器(ARM:CortexA7)上,GCC编译器不会抛出编译错误,因为正确包含了以下头文件。
struct cpufreq_govinfo {
unsigned int cpu;
unsigned int load;
unsigned int sampling_rate_us;
};
此外,以下补丁将使您在构建Linux内核后拥有预处理文件。
kernel/include/linux/cpufreq.h
如果您查看预处理文件.tmp_core_ctl.i,您将能够看到所有用于编译core_ctl.c的头文件。