chardev debuggings#3
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- guides/01: 补漏 CROSS_COMPILE 默认 ARM32 工具链 + build 假 SUCCESS 的大坑 - configs: mini config 加 KPROBES/KRETPROBES;关 DEBUG_ATOMIC_SLEEP/DYNAMIC_DEBUG(致外部模块 modpost 失败) - rootfs init: /dev 从 tmpfs 改 devtmpfs(否则 misc 设备节点不自动创建) - .gitignore: 补 example 编译产物 + /wait.md
example/mini 新增(arm64/6.19.9, QEMU ARM64 亲测过): - 01-chardev_basic: misc + fops + copy_*_user 边界检查(-EFBIG) - 02-ioctl: _IOWR/_IO 编码 + switch + compat_ptr_ioctl + 用户态程序 - 03-poll: poll_wait + wait_queue + 阻塞 read + O_NONBLOCK - 04-mmap: vm_insert_page 映射内核页,双向读写 - 05-irq: platform driver + 线程化 irq + workqueue(需设备树设备) - 06-dbgprintk: 八级 loglevel + pr_fmt(pr_debug 默认隐藏) - 07-oops: NULL deref oops(trigger 门控),完整现场 教程 drivers/01-04 + debugging/01,05 升 maturity verified,动手章节填真实输出 进度账本: drv-chardev/ioctl/poll/mmap + debug-printk/oops 六节点 completed
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