LinuxKPI: Add abs_diff to linux/math.h

[wulf]

Summary

It returns absolute value of the difference between the arguments.

Sponsored by: Serenity Cyber Security, LLC
MFC after: 1 week

[bz]

sys/compat/linuxkpi/common/include/linux/math.h

58

why do we need this version check if we haven't had it before? Is there's a reason add it as comment or to the commit message please.

[wulf]

Add version check explanation to commit message

[wulf]

In D45453#1036976, @wulf wrote:

Add version check explanation to commit message

The explanation is

Add LinuxKPI version check as the macro was moved from drm-kmod to
linux/math.h in Linux kernel commit 46f12960aad (6.6 timeframe).

It seems git arc can not update summary

[bz]

Thanks for the update!