K 10
svn:author
V 4
manu
K 8
svn:date
V 27
2020-05-17T20:09:11.064478Z
K 7
svn:log
V 291
linuxkpi: Add atomic_dec_and_mutex_lock

This function decrement the counter and if the result is 0 it acquires
the mutex and returns 1, if not it simply returns 0.
Needed by DRM from Linux v5.3

Sponsored-by: The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D24847

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