[Bug 286512] linuxkpi: amdgpu regressed after base 325aa4dbd10d

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286512

--- Comment #23 from crahman@gmail.com ---
I haven't studied this enough to know if troublesome values can occur, but in
jiffies.h, there are some problematic uses of unsigned and signed variables,
e.g. in linux_timer_jiffies() or time_after().

For example, if you want to know if a > b, (long)(b - a) < 0 will not always
provide the correct answer when a and b are unsigned.

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