11927 Log, or optionally panic, on zero-length kmem allocations
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Jason King <jason.brian.king@gmail.com>

@@ -98,10 +98,13 @@
        garbage. This random garbage may include secure kernel data. Therefore,
        uninitialized kernel memory should be handled carefully. For example,
        never copyout(9F) a potentially uninitialized buffer.
 
 NOTES
-       kmem_alloc(0, flag) always returns NULL.  kmem_free(NULL, 0) is legal.
+       kmem_alloc(0, flag) always returns NULL, but if KM_SLEEP is set, this
+       behavior is considered to be deprecated; the system may be configured
+       to explicitly panic in this case in lieu of returning NULL.
+       kmem_free(NULL, 0) is legal, however.
 
 
 
-                               October 22, 2014                 KMEM_ALLOC(9F)
+                               November 20, 2019                KMEM_ALLOC(9F)