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linuxkpi: Add atomic_dec_and_mutex_lock
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Authored by manu on May 15 2020, 9:24 AM.

Details

Summary

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

Diff Detail

Repository
rS FreeBSD src repository
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Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

manu requested review of this revision.May 15 2020, 9:24 AM
This revision was not accepted when it landed; it landed in state Needs Review.May 17 2020, 8:09 PM
This revision was automatically updated to reflect the committed changes.
head/sys/compat/linuxkpi/common/include/linux/mutex.h
129

Try to follow BSD style. Linebreak after int, before atomic_ .