boot time variable

[valdis.kletnieks at vt.edu]

On Tue, 10 Oct 2017 10:17:09 +1100, "Tobin C. Harding" said:
> I would like to create a boot time variable i.e a variable that is set once at boot time. Variable
> does not need to be globally accessible. (actually I am using two variables).

The canonical way to have stuff happen at boot is usually declaring
an initcall.

> how/where to initialize the lock in a race free manner?

Step 0: Figure out how once-at-boot code could *possibly* be called
a second time.  What are you worried about racing here?
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