From: Tiezhu Yang

Sent: 11 December 2021 03:33

v2:
  -- add copy_to_user_or_kernel() in lib/usercopy.c
  -- define userbuf as bool type

Instead of having a flag to indicate whether the buffer is user or kernel,
would it be better to have two separate buffer pointers.
One for a user space buffer, the other for a kernel space buffer.
Exactly one of the buffers should always be NULL.

That way the flag is never incorrectly set.

	David

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