WARNING: mutexes are preferred for single holder semaphores

[Paul Mackerras]

Sean MacLennan writes:

> This is a bit OT, but I got the warning in the subject from
> checkpatch.pl for a piece of code. The code *is* using a mutex. Does it
> actually mean I shouldn't use a mutex?

I don't require zero checkpatch warnings or errors on patches before I
accept them.  If what checkpatch is saying is rubbish, just ignore it.

Paul.