svn commit: r358248 - head/sys/vm

[Kyle Evans]

Author: kevans
Date: Sat Feb 22 16:20:04 2020
New Revision: 358248
URL: https://svnweb.freebsd.org/changeset/base/358248

Log:
  vm_radix: prefer __builtin_unreachable() to an unreachable panic()
  
  This provides the needed hint to GCC and offers an annotation for readers to
  observe that it's in-fact impossible to hit this point. We'll get hit with a
  a -Wswitch error if the enum applicable to the switch above were to get
  expanded without the new value(s) being handled.

Modified:
  head/sys/vm/vm_radix.c

Modified: head/sys/vm/vm_radix.c
==============================================================================
--- head/sys/vm/vm_radix.c	Sat Feb 22 13:23:27 2020	(r358247)
+++ head/sys/vm/vm_radix.c	Sat Feb 22 16:20:04 2020	(r358248)
@@ -208,8 +208,7 @@ vm_radix_node_load(smrnode_t *p, enum vm_radix_access 
 	case SMR:
 		return (smr_entered_load(p, vm_radix_smr));
 	}
-	/* This is unreachable, silence gcc. */
-	panic("vm_radix_node_get: Unknown access type");
+	__unreachable();
 }
 
 static __inline void