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

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• hselasky
emaste

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rS361138: linuxkpi: Add atomic_dec_and_mutex_lock

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

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rS FreeBSD src repository - subversion

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manu created this revision.May 15 2020, 9:24 AM

Herald added a subscriber: imp. · View Herald TranscriptMay 15 2020, 9:24 AM

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

Closed by commit rS361138: linuxkpi: Add atomic_dec_and_mutex_lock (authored by manu). · Explain Why

This revision was automatically updated to reflect the committed changes.

manu added a commit: rS361138: linuxkpi: Add atomic_dec_and_mutex_lock.

• hselasky added inline comments.May 17 2020, 8:12 PM

head/sys/compat/linuxkpi/common/include/linux/mutex.h
129 ↗	(On Diff #71891)	Try to follow BSD style. Linebreak after int, before atomic_ .

manu mentioned this in rS364654: MFC r361007, r361138-r361140, r361245-r361246.Aug 24 2020, 10:46 AM

Revision Contents
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sys/

compat/

linuxkpi/

common/

include/

linux/

mutex.h

11 lines

Diff 71810

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

linuxkpi: Add atomic_dec_and_mutex_lockClosedPublicActions