linux-kernel - [PATCH v5 4/7] resource: Introduce resource_intersection() for overlapping resources

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Message-Id: <20201103203655.17701-5-andriy.shevchenko@linux.intel.com>
Date:   Tue,  3 Nov 2020 22:36:52 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     linux-acpi@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH v5 4/7] 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@...ux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 include/linux/ioport.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 40320eb5bc0e..ece1a8db309c 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -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)
 {
-- 
2.28.0