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Add UMA_ALIGNOF().

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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.

Discussed on:	arch@
MFC after:	1 week
Sponsored by:	DARPA / AFRL
This commit is contained in:
jhb 2017-09-27 23:15:33 +00:00
parent 67cf61ca22
commit 13b1e2684d
1 changed files with 1 additions and 0 deletions
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sys/vm/uma.h
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@ -296,6 +296,7 @@ uma_zone_t uma_zcache_create(char *name, int size, uma_ctor ctor, uma_dtor dtor,
#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.