D24847.id71810.diff
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D24847.id71810.diff
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	Index: sys/compat/linuxkpi/common/include/linux/mutex.h
	===================================================================
	--- sys/compat/linuxkpi/common/include/linux/mutex.h
	+++ 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;
	@@ -125,6 +126,16 @@
	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
	/* NOTE: the maximum WITNESS name is 64 chars */
	#define __mutex_name(name, file, line) \