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tmpfs

希望记得区分 shm_fault 和 shmem_fault

static vm_fault_t shm_fault(struct vm_fault *vmf)
{
	struct file *file = vmf->vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);

	return sfd->vm_ops->fault(vmf);
}

https://mp.weixin.qq.com/s/2QOsQUShYD7wqemJzTwIzg

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