linux kernel map网址

https://makelinux.github.io/kernel/map/

源码分析

点击Scheduler标签内的kernel/sched/

左侧菜单，选择一个内核版本

Search Identifier搜索框输入要搜索的函数，回车执行搜索

 结果列出了一处函数定义及两处引用

 新窗口打开定义

可以看到该函数的源码

 回到上个页面，点击一处引用，查看调用处

 网页会自动显示到调用处，并有色块标注

点击do_sched_cfs_period_timer 

网页跳转到该函数搜索结果页面，继续点击引用

依次循环，找出完整的调用链路 

 分支1：调用处

• kernel/sched/core.c, line 6056

void __init sched_init(void)

 到达内核入口函数

asmlinkage __visible void __init start_kernel(void)

 分支2：调用处

• kernel/sched/fair.c, line 10085

 分支1：

• kernel/sched/autogroup.c, line 71

  ksys_setsid分支2

• init/do_mounts_initrd.c, line 38

 位于

static noinline void __init kernel_init_freeable(void)

到达kernel_init 

 ksys_setsid分支2

• kernel/sys.c, line 1190

 宏定义宏展开SYSCALL_DEFINED(setsid)

SYSCALL_METADATA(setsid, 0); \\
asmlinkage long sys_setsid(void); \\
ALLOW_ERROR_iNJECTION(sys_setsid, ERRNO); \\
asmlinkage long sys_setsid(void)

 参考：

https://blog.csdn.net/hknaruto/article/details/129857542

利用gcc展开

gcc \\
-E \\
-Wp,-MD,kernel/.sys.o.d \\
-nostdinc \\
-isystem \\
/usr/lib/gcc/aarch64-linux-gnu/7.3.0/include \\
-I./arch/arm64/include \\
-I./arch/arm64/include/generated \\
-I./include \\
-I./arch/arm64/include/uapi \\
-I./arch/arm64/include/generated/uapi \\
-I./include/uapi \\
-I./include/generated/uapi \\
-include \\
./include/linux/kconfig.h \\
-include \\
./include/linux/compiler_types.h \\
-D__KERNEL__ \\
-mlittle-endian \\
-Wall \\
-Wundef \\
-Wstrict-prototypes \\
-Wno-trigraphs \\
-fno-strict-aliasing \\
-fno-common \\
-fshort-wchar \\
-Werror-implicit-function-declaration \\
-Wno-format-security \\
-std=gnu89 \\
-fno-PIE \\
-mgeneral-regs-only \\
-DCONFIG_AS_LSE=1 \\
-fno-asynchronous-unwind-tables \\
-Wno-psabi \\
-mabi=lp64 \\
-fno-delete-null-pointer-checks \\
-Wno-frame-address \\
-Wno-format-truncation \\
-Wno-format-overflow \\
-Wno-int-in-bool-context \\
-O2 \\
--param=allow-store-data-races=0 \\
-Wframe-larger-than=2048 \\
-fstack-protector-strong \\
-Wno-unused-but-set-variable \\
-Wno-unused-const-variable \\
-fno-omit-frame-pointer \\
-fno-optimize-sibling-calls \\
-fno-var-tracking-assignments \\
-g \\
-gdwarf-4 \\
-pg \\
-fno-inline-functions-called-once \\
-Wdeclaration-after-statement \\
-Wno-pointer-sign \\
-fno-strict-overflow \\
-fno-merge-all-constants \\
-fmerge-constants \\
-fno-stack-check \\
-fconserve-stack \\
-Werror=implicit-int \\
-Werror=strict-prototypes \\
-Werror=date-time \\
-Werror=incompatible-pointer-types \\
-Werror=designated-init \\
-DKBUILD_BASENAME=\\"sys\\" \\
-DKBUILD_MODNAME=\\"sys\\" \\
-o \\
/tmp/sys.E.c \\
"kernel/sys.c"

查看/tmp/sys.E.c

static const char *types__setsid[] = { }; static const char *args__setsid[] = { }; static struct syscall_metadata __syscall_meta__setsid; static struct trace_event_call __attribute__((__used__)) event_enter__setsid = { .class = &event_class_syscall_enter, { .name = "sys_enter""      _setsid", }, .event.funcs = &enter_syscall_print_funcs, .data = (void *)&__syscall_meta__setsid, .flags = TRACE_EVENT_FL_CAP_ANY, }; static struct trace_event_call __attribute__((__used__)) __attribute__((section("_ftrace_events"))) *__event_enter__setsid = &event_enter__setsid      ;; static struct syscall_metadata __syscall_meta__setsid; static struct trace_event_call __attribute__((__used__)) event_exit__setsid = { .class = &event_class_syscall_exit, { .name = "sys_exit""_setsid", }, .event.funcs = &exit_syscall_print_funcs, .data = (void *)&__syscall_m      eta__setsid, .flags = TRACE_EVENT_FL_CAP_ANY, }; static struct trace_event_call __attribute__((__used__)) __attribute__((section("_ftrace_events"))) *__event_exit__setsid = &event_exit__setsid;; static struct syscall_metadata __attribute__((__used__)) __syscall_meta__setsid = {       .name = "sys""_setsid", .syscall_nr = -1, .nb_args = 0, .types = 0 ? types__setsid : ((void *)0), .args = 0 ? args__setsid : ((void *)0), .enter_event = &event_enter__setsid, .exit_event = &event_exit__setsid, .enter_fields = { &(__syscall_meta__setsid.enter_fields), &(__sysca      ll_meta__setsid.enter_fields) }, }; static struct syscall_metadata __attribute__((__used__)) __attribute__((section("__syscalls_metadata"))) *__p_syscall_meta__setsid = &__syscall_meta__setsid;; long __arm64_sys_setsid(const struct pt_regs *__unused); ; long __arm64_sys_setsid(      const struct pt_regs *__unused)
{return ksys_setsid();
}

最终生成的函数名long __arm64_sys_setsid( const struct pt_regs *__unused)

搜索不到结果，应该是宏修饰导致