D56282.diff
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	diff --git a/sys/compat/linuxkpi/common/include/linux/ascii85.h b/sys/compat/linuxkpi/common/include/linux/ascii85.h
	new file mode 100644
	--- /dev/null
	+++ b/sys/compat/linuxkpi/common/include/linux/ascii85.h
	@@ -0,0 +1,46 @@
	+/*
	+ * SPDX-License-Identifier: BSD-2-Clause
	+ *
	+ * Copyright (c) 2026 The FreeBSD Foundation
	+ */
	+
	+#ifndef _LINUXKPI_LINUX_ASCII85_H_
	+#define _LINUXKPI_LINUX_ASCII85_H_
	+
	+#include <sys/param.h>
	+
	+#define ASCII85_BUFSZ 6
	+
	+static inline long
	+ascii85_encode_len(long in_len)
	+{
	+ long out_len;
	+
	+ out_len = howmany(in_len, 4);
	+
	+ return (out_len);
	+}
	+
	+static inline const char *
	+ascii85_encode(uint32_t in, char *out)
	+{
	+ int i;
	+
	+ if (in == 0) {
	+ out[0] = 'z';
	+ out[1] = '\0';
	+ return (out);
	+ }
	+
	+ for (i = ASCII85_BUFSZ - 2; i >= 0; i--) {
	+ out[i] = in % 85;
	+ out[i] += 33;
	+
	+ in /= 85;
	+ }
	+ out[ASCII85_BUFSZ - 1] = '\0';
	+
	+ return (out);
	+}
	+
	+#endif /* _LINUXKPI_LINUX_ASCII85_H_ */