Hi. I've found this: Pointers are __u64, cast from/to a uintptr_t on the userspace side and from/to a void __user * in the kernel. Try really hard not to delay this conversion or worse, fiddle the raw __u64 through your code since that diminishes the checking tools like sparse can provide. The macro u64_to_user_ptr can be used in the kernel to avoid warnings about integers and pointers of different sizes.
https://origin.kernel.org/doc/html/latest/process/botching-up-ioctls.html#:~:text=Pointers%20are%20__u64
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