커널빌드 오류들

char \*get\_task\_comm(char \*buf, struct task\_struct \*tsk)  
{  
/\* buf must be at least sizeof(tsk->comm) in size \*/  
task\_lock(tsk);  
strncpy(buf, tsk->comm, sizeof(tsk->comm));  
task\_unlock(tsk);  
return buf;  
}

fs/exec.c: In function ‘get\_task\_comm’:  
fs/exec.c:1069:39: warning: argument to ‘sizeof’ in ‘strncpy’ call is the same expression as the source; did you mean to use the size of the destination? \[-Wsizeof-pointer-memaccess\]  
1069 | strncpy(buf, tsk->comm, sizeof(tsk->comm));  

|
일단 msm8917common kernel github에 올라온걸로 defconfig elitetlekx 옮겨서 뚜따뚜따하다가 빌드하는 중인데, 에러들 보니깐 뒷골이 멍해져서 하나하나 풀려고한다. 일단 첫번째 에러는 다음과 같다 그냥 스트럭트 구조체한번 뜯어보면 될것같다음-202402141004

아 알고보니깐 set_tastk_comm을 뜯어보고있었네 그냥 주석으로 buf 사이즈가 tsk->comm 사이즈보다 커야한다고 적어놨네요잉

---

CC      kernel/irq/chip.o
In file included from include/linux/compiler.h:54,
                 from include/linux/linkage.h:4,
                 from include/linux/preempt.h:9,
                 from include/linux/spinlock.h:50,
                 from include/linux/mmzone.h:7,
                 from include/linux/gfp.h:5,
                 from include/linux/mm.h:9,
                 from kernel/sched/core.c:29:
kernel/sched/core.c: In function ‘sched_init’:
include/linux/compiler-gcc.h:163:9: error: ‘struct cfs_rq’ has no member named ‘rq’
  163 |         __builtin_offsetof(a, b)
      |         ^~~~~~~~~~~~~~~~~~
include/linux/stddef.h:16:33: note: in expansion of macro ‘__compiler_offsetof’
   16 | #define offsetof(TYPE, MEMBER)  __compiler_offsetof(TYPE, MEMBER)
      |                                 ^~~~~~~~~~~~~~~~~~~
kernel/sched/core.c:10615:25: note: in expansion of macro ‘offsetof’
10615 |                         offsetof(struct cfs_rq, rq));
      |                         ^~~~~~~~
  CC      mm/swap.o

이제 이거 문제인데 또 뭔가 정의가 안됐다고 하네요잉

#ifdef CONFIG\_FAIR\_GROUP\_SCHED

struct rq \*rq; /\* cpu runqueue to which this cfs\_rq is attached \*/

/\*

\* leaf cfs\_rqs are those that hold tasks (lowest schedulable entity in

\* a hierarchy). Non-leaf lrqs hold other higher schedulable entities

\* (like users, containers etc.)

\*

\* leaf\_cfs\_rq\_list ties together list of leaf cfs\_rq's in a cpu. This

\* list is used during load balance.

\*/

int on\_list;

struct list\_head leaf\_cfs\_rq\_list;

struct task\_group \*tg; /\* group that "owns" this runqueue \*/

이거보니깐 아무래도 CONFIG_FAIR_GROUP_SCHED가 y로 정의가 안돼서 runqueue struct가 안잡힌거 같네요잉

진짜 뭐지뭐지하다가 알고보니 CONFIG_SMP도 y로 정의를 해줘야 굴러가는거요잉 

이거 공룡책 처음에 나오는 Symmetric Multi Processor인가 그거같은데 그파트 공부해야겠어요잉 -202502151246