REGION_INTERSECTS(9)                   Hardware Interfaces                   REGION_INTERSECTS(9)



NAME
       region_intersects - determine intersection of region with known resources

SYNOPSIS
       int region_intersects(resource_size_t start, size_t size, unsigned long flags,
                             unsigned long desc);

ARGUMENTS
       start
           region start address

       size
           size of region

       flags
           flags of resource (in iomem_resource)

       desc
           descriptor of resource (in iomem_resource) or IORES_DESC_NONE

DESCRIPTION
       Check if the specified region partially overlaps or fully eclipses a resource identified
       by flags and desc (optional with IORES_DESC_NONE). Return REGION_DISJOINT if the region
       does not overlap flags/desc, return REGION_MIXED if the region overlaps flags/desc and
       another resource, and return REGION_INTERSECTS if the region overlaps flags/desc and no
       other defined resource. Note that REGION_INTERSECTS is also returned in the case when the
       specified region overlaps RAM and undefined memory holes.

       region_intersect is used by memory remapping functions to ensure the user is not remapping
       RAM and is a vast speed up over walking through the resource table page by page.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                      REGION_INTERSECTS(9)