resource: Introduce resource_union() for overlapping resources (5562f35d) · Commits · 戴 / test

Some already present users may utilize resource_union() helper. Provide it for them and for wider use in the future. Signed-off-by:

include/linux/ioport.h

+12 −1

Original line number	Diff line number	Diff line
		@@ -10,9 +10,10 @@
		#define _LINUX_IOPORT_H

		#ifndef __ASSEMBLY__
		#include <linux/bits.h>
		#include <linux/compiler.h>
		#include <linux/minmax.h>
		#include <linux/types.h>
		#include <linux/bits.h>
		/*
		* Resources are tree-like, allowing
		* nesting etc..
		@@ -235,6 +236,16 @@ static inline bool resource_overlaps(struct resource r1, struct resource r2)
		return r1->start <= r2->end && r1->end >= r2->start;
		}

		static inline bool
		resource_union(struct resource r1, struct resource r2, struct resource *r)
		{
		if (!resource_overlaps(r1, r2))
		return false;
		r->start = min(r1->start, r2->start);
		r->end = max(r1->end, r2->end);
		return true;
		}

		/* Convenience shorthand with allocation */
		#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
		#define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)