svn commit: r324602 - in stable: 10/sys/vm 11/sys/vm

[John Baldwin]

Author: jhb
Date: Fri Oct 13 17:11:08 2017
New Revision: 324602
URL: https://svnweb.freebsd.org/changeset/base/324602

Log:
  MFC 324072: Add UMA_ALIGNOF().
  
  This is a wrapper around _Alignof() that sets the alignment for a zone
  to the alignment required by a given type.  This allows the compiler to
  determine the proper alignment rather than having the programmer try to
  guess.

Modified:
  stable/11/sys/vm/uma.h
Directory Properties:
  stable/11/   (props changed)

Changes in other areas also in this revision:
Modified:
  stable/10/sys/vm/uma.h
Directory Properties:
  stable/10/   (props changed)

Modified: stable/11/sys/vm/uma.h
==============================================================================
--- stable/11/sys/vm/uma.h	Fri Oct 13 16:31:50 2017	(r324601)
+++ stable/11/sys/vm/uma.h	Fri Oct 13 17:11:08 2017	(r324602)
@@ -296,6 +296,7 @@ uma_zone_t uma_zcache_create(char *name, int size, uma
 #define UMA_ALIGN_SHORT	(sizeof(short) - 1)	/* "" short */
 #define UMA_ALIGN_CHAR	(sizeof(char) - 1)	/* "" char */
 #define UMA_ALIGN_CACHE	(0 - 1)			/* Cache line size align */
+#define	UMA_ALIGNOF(type) (_Alignof(type) - 1)	/* Alignment fit for 'type' */
 
 /*
  * Destroys an empty uma zone.  If the zone is not empty uma complains loudly.