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resource: Introduce resource_intersection() for overlapping resources 

There will be at least one user that can utilize new helper.
Provide the helper for future user and for wider use.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-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 22:45:07 +02:00 committed by Rafael J. Wysocki
parent 5562f35d7f
commit f65674df1b
1 changed files with 10 additions and 0 deletions
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10
include/linux/ioport.h
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@ -236,6 +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_intersection(struct resource *r1, struct resource *r2, struct resource *r)
{
if (!resource_overlaps(r1, r2))
return false;
r->start = max(r1->start, r2->start);
r->end = min(r1->end, r2->end);
return true;
}
static inline bool
resource_union(struct resource *r1, struct resource *r2, struct resource *r)
{