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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/range.h
..
..
@@ -1,12 +1,18 @@
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 /* SPDX-License-Identifier: GPL-2.0 */
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 #ifndef _LINUX_RANGE_H
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 #define _LINUX_RANGE_H
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+#include <linux/types.h>
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 struct range {
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 	u64   start;
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 	u64   end;
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 };
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+static inline u64 range_len(const struct range *range)
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+{
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+	return range->end - range->start + 1;
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+}
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+
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 int add_range(struct range *range, int az, int nr_range,
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 		u64 start, u64 end);
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