kernel veraion 2.4.18...
Memory is allocated (kmalloc) in the "open" call.
The above memory is used in copy_from/to in the "ioctl" (and possibly
the read/write) call.
I understand that the copy_from/to may wait for pages to be swapped in,
If the waiting process is killed at this point, is it safe to free the
memory in the "close/release" call? If not, when is it safe to call kfree?
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