2 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/bsearch.h b/include/linux/bsearch.h
new file mode 100644
index 0000000..e66b711
--- /dev/null
+++ b/include/linux/bsearch.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_BSEARCH_H
+#define _LINUX_BSEARCH_H
+
+#include <linux/types.h>
+
+static __always_inline
+void *__inline_bsearch(const void *key, const void *base, size_t num, size_t size, cmp_func_t cmp)
+{
+	const char *pivot;
+	int result;
+
+	while (num > 0) {
+		pivot = base + (num >> 1) * size;
+		result = cmp(key, pivot);
+
+		if (result == 0)
+			return (void *)pivot;
+
+		if (result > 0) {
+			base = pivot + size;
+			num--;
+		}
+		num >>= 1;
+	}
+
+	return NULL;
+}
+
+extern void *bsearch(const void *key, const void *base, size_t num, size_t size, cmp_func_t cmp);
+
+#endif /* _LINUX_BSEARCH_H */
diff --git a/include/linux/types.h b/include/linux/types.h
index c9886cb..77f9673 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -76,4 +76,6 @@ typedef __u64 __bitwise __be64;
 
 typedef u64 sector_t;
 
+typedef int (*cmp_func_t)(const void *a, const void *b);
+
 #endif /* _TOOLS_LINUX_TYPES_H_ */