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resource: Introduce resource_union() for overlapping resources

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

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2020-11-03 22:45:06 +02:00 committed by Rafael J. Wysocki
parent 1f90f6a835
commit 5562f35d7f
1 changed files with 13 additions and 2 deletions
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15
include/linux/ioport.h
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@ -10,9 +10,10 @@
#define _LINUX_IOPORT_H
#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/bits.h>
#include <linux/compiler.h>
#include <linux/minmax.h>
#include <linux/types.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)