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Index: sys/compat/linuxkpi/common/include/linux/rwsem.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/rwsem.h
+++ sys/compat/linuxkpi/common/include/linux/rwsem.h
@@ -51,6 +51,7 @@
#define down_read_nested(_rw, _sc) down_read(_rw)
#define init_rwsem(_rw) linux_init_rwsem(_rw, rwsem_name("lnxrwsem"))
#define down_write_nest_lock(sem, _rw) down_write(_rw)
+#define rwsem_is_contended(_rw) sx_xlocked(&(_rw)->sx)
#ifdef WITNESS_ALL
/* NOTE: the maximum WITNESS name is 64 chars */

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