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    Subject[PATCH v4 3/6] resource: Introduce resource_union() for overlapping resources
    Date
    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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
    Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
    Cc: Bjorn Helgaas <bhelgaas@google.com>
    Cc: linux-pci@vger.kernel.org
    ---
    include/linux/ioport.h | 13 ++++++++++++-
    1 file changed, 12 insertions(+), 1 deletion(-)

    diff --git a/include/linux/ioport.h b/include/linux/ioport.h
    index df4581107536..40320eb5bc0e 100644
    --- a/include/linux/ioport.h
    +++ b/include/linux/ioport.h
    @@ -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)
    --
    2.28.0
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