D24847.diff
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	Index: head/sys/compat/linuxkpi/common/include/linux/mutex.h
	===================================================================
	--- head/sys/compat/linuxkpi/common/include/linux/mutex.h
	+++ head/sys/compat/linuxkpi/common/include/linux/mutex.h
	@@ -37,6 +37,7 @@
	#include <sys/sx.h>

	#include <linux/spinlock.h>
	+#include <asm/atomic.h>

	typedef struct mutex {
	struct sx sx;
	@@ -123,6 +124,16 @@
	mutex_is_owned(mutex_t *m)
	{
	return (sx_xlocked(&m->sx));
	+}
	+
	+static inline int atomic_dec_and_mutex_lock(atomic_t cnt, struct mutex m)
	+{
	+ if (atomic_dec_and_test(cnt)) {
	+ mutex_lock(m);
	+ return (1);
	+ }
	+
	+ return (0);
	}

	#ifdef WITNESS_ALL