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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/lib/bitmap.c
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@@ -1,9 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * From lib/bitmap.c
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  * Helper functions for bitmap.h.
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- *
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- * This source code is licensed under the GNU General Public License,
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- * Version 2.  See the file COPYING for more details.
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  */
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 #include <linux/bitmap.h>
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@@ -73,3 +71,18 @@
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 			   BITMAP_LAST_WORD_MASK(bits));
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 	return result != 0;
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 }
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+
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+int __bitmap_equal(const unsigned long *bitmap1,
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+		const unsigned long *bitmap2, unsigned int bits)
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+{
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+	unsigned int k, lim = bits/BITS_PER_LONG;
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+	for (k = 0; k < lim; ++k)
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+		if (bitmap1[k] != bitmap2[k])
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+			return 0;
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+
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+	if (bits % BITS_PER_LONG)
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+		if ((bitmap1[k] ^ bitmap2[k]) & BITMAP_LAST_WORD_MASK(bits))
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+			return 0;
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+
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+	return 1;
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+}