bus: Add a new IVAR accessor to check for the existence of an IVAR

<varp>_has_<var> returns true if the given IVAR can be read.

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D55352

This commit is contained in:

John Baldwin

2026-02-24 15:28:28 -05:00

parent 82b293ea69

commit cb5a0eb053

1 changed files with 11 additions and 0 deletions

									
										sys/sys/bus.h
									
		+11
		
												View File
												
				@@ -945,6 +945,17 @@ DECLARE_MODULE(_name##_##busname, _name##_##busname##_mod,		\

				 */

				#define __BUS_ACCESSOR(varp, var, ivarp, ivar, type)			\

													\

				static __inline bool							\

				varp ## _has_ ## var(device_t dev)					\

				{									\

					uintptr_t v = 0;						\

					int e;								\

													\

					e = BUS_READ_IVAR(device_get_parent(dev), dev,			\

					    ivarp ## _IVAR_ ## ivar, &v);				\

					return (e == 0);						\

				}									\

													\

				static __inline type							\

				varp ## _get_ ## var(device_t dev)					\

				{									\