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Message-Id: <20201103204510.19154-5-andriy.shevchenko@linux.intel.com>
Date: Tue, 3 Nov 2020 22:45:07 +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>,
Hanjun Guo <guohanjun@...wei.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH v6 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: Hanjun Guo <guohanjun@...wei.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
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