diff --git a/lib/packing.c b/lib/packing.c
index 793942745e34..f237b8af99f5 100644
--- a/lib/packing.c
+++ b/lib/packing.c
@@ -51,64 +51,20 @@ static size_t calculate_box_addr(size_t box, size_t len, u8 quirks)
 	return offset_of_group + offset_in_group;
 }
 
-/**
- * pack - Pack u64 number into bitfield of buffer.
- *
- * @pbuf: Pointer to a buffer holding the packed value.
- * @uval: CPU-readable unpacked value to pack.
- * @startbit: The index (in logical notation, compensated for quirks) where
- *	      the packed value starts within pbuf. Must be larger than, or
- *	      equal to, endbit.
- * @endbit: The index (in logical notation, compensated for quirks) where
- *	    the packed value ends within pbuf. Must be smaller than, or equal
- *	    to, startbit.
- * @pbuflen: The length in bytes of the packed buffer pointed to by @pbuf.
- * @quirks: A bit mask of QUIRK_LITTLE_ENDIAN, QUIRK_LSW32_IS_FIRST and
- *	    QUIRK_MSB_ON_THE_RIGHT.
- *
- * Return: 0 on success, EINVAL or ERANGE if called incorrectly. Assuming
- *	   correct usage, return code may be discarded. The @pbuf memory will
- *	   be modified on success.
- */
-int pack(void *pbuf, u64 uval, size_t startbit, size_t endbit, size_t pbuflen,
-	 u8 quirks)
+static void __pack(void *pbuf, u64 uval, size_t startbit, size_t endbit,
+		   size_t pbuflen, u8 quirks)
 {
 	/* Logical byte indices corresponding to the
 	 * start and end of the field.
 	 */
-	int plogical_first_u8, plogical_last_u8, box;
-	/* width of the field to access in the pbuf */
-	u64 value_width;
-
-	/* startbit is expected to be larger than endbit, and both are
-	 * expected to be within the logically addressable range of the buffer.
-	 */
-	if (unlikely(startbit < endbit || startbit >= BITS_PER_BYTE * pbuflen))
-		/* Invalid function call */
-		return -EINVAL;
-
-	value_width = startbit - endbit + 1;
-	if (unlikely(value_width > 64))
-		return -ERANGE;
-
-	/* Check if "uval" fits in "value_width" bits.
-	 * If value_width is 64, the check will fail, but any
-	 * 64-bit uval will surely fit.
-	 */
-	if (unlikely(value_width < 64 && uval >= (1ull << value_width)))
-		/* Cannot store "uval" inside "value_width" bits.
-		 * Truncating "uval" is most certainly not desirable,
-		 * so simply erroring out is appropriate.
-		 */
-		return -ERANGE;
+	int plogical_first_u8 = startbit / BITS_PER_BYTE;
+	int plogical_last_u8 = endbit / BITS_PER_BYTE;
+	int box;
 
 	/* Iterate through an idealistic view of the pbuf as an u64 with
 	 * no quirks, u8 by u8 (aligned at u8 boundaries), from high to low
 	 * logical bit significance. "box" denotes the current logical u8.
 	 */
-	plogical_first_u8 = startbit / BITS_PER_BYTE;
-	plogical_last_u8  = endbit / BITS_PER_BYTE;
-
 	for (box = plogical_first_u8; box >= plogical_last_u8; box--) {
 		/* Bit indices into the currently accessed 8-bit box */
 		size_t box_start_bit, box_end_bit, box_addr;
@@ -163,15 +119,13 @@ int pack(void *pbuf, u64 uval, size_t startbit, size_t endbit, size_t pbuflen,
 		((u8 *)pbuf)[box_addr] &= ~box_mask;
 		((u8 *)pbuf)[box_addr] |= pval;
 	}
-	return 0;
 }
-EXPORT_SYMBOL(pack);
 
 /**
- * unpack - Unpack u64 number from packed buffer.
+ * pack - Pack u64 number into bitfield of buffer.
  *
  * @pbuf: Pointer to a buffer holding the packed value.
- * @uval: Pointer to an u64 holding the unpacked value.
+ * @uval: CPU-readable unpacked value to pack.
  * @startbit: The index (in logical notation, compensated for quirks) where
  *	      the packed value starts within pbuf. Must be larger than, or
  *	      equal to, endbit.
@@ -183,16 +137,12 @@ EXPORT_SYMBOL(pack);
  *	    QUIRK_MSB_ON_THE_RIGHT.
  *
  * Return: 0 on success, EINVAL or ERANGE if called incorrectly. Assuming
- *	   correct usage, return code may be discarded. The @uval will be
- *	   modified on success.
+ *	   correct usage, return code may be discarded. The @pbuf memory will
+ *	   be modified on success.
  */
-int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
-	   size_t pbuflen, u8 quirks)
+int pack(void *pbuf, u64 uval, size_t startbit, size_t endbit, size_t pbuflen,
+	 u8 quirks)
 {
-	/* Logical byte indices corresponding to the
-	 * start and end of the field.
-	 */
-	int plogical_first_u8, plogical_last_u8, box;
 	/* width of the field to access in the pbuf */
 	u64 value_width;
 
@@ -207,6 +157,33 @@ int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
 	if (unlikely(value_width > 64))
 		return -ERANGE;
 
+	/* Check if "uval" fits in "value_width" bits.
+	 * If value_width is 64, the check will fail, but any
+	 * 64-bit uval will surely fit.
+	 */
+	if (value_width < 64 && uval >= (1ull << value_width))
+		/* Cannot store "uval" inside "value_width" bits.
+		 * Truncating "uval" is most certainly not desirable,
+		 * so simply erroring out is appropriate.
+		 */
+		return -ERANGE;
+
+	__pack(pbuf, uval, startbit, endbit, pbuflen, quirks);
+
+	return 0;
+}
+EXPORT_SYMBOL(pack);
+
+static void __unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
+		     size_t pbuflen, u8 quirks)
+{
+	/* Logical byte indices corresponding to the
+	 * start and end of the field.
+	 */
+	int plogical_first_u8 = startbit / BITS_PER_BYTE;
+	int plogical_last_u8 = endbit / BITS_PER_BYTE;
+	int box;
+
 	/* Initialize parameter */
 	*uval = 0;
 
@@ -214,9 +191,6 @@ int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
 	 * no quirks, u8 by u8 (aligned at u8 boundaries), from high to low
 	 * logical bit significance. "box" denotes the current logical u8.
 	 */
-	plogical_first_u8 = startbit / BITS_PER_BYTE;
-	plogical_last_u8  = endbit / BITS_PER_BYTE;
-
 	for (box = plogical_first_u8; box >= plogical_last_u8; box--) {
 		/* Bit indices into the currently accessed 8-bit box */
 		size_t box_start_bit, box_end_bit, box_addr;
@@ -271,6 +245,46 @@ int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
 		*uval &= ~proj_mask;
 		*uval |= pval;
 	}
+}
+
+/**
+ * unpack - Unpack u64 number from packed buffer.
+ *
+ * @pbuf: Pointer to a buffer holding the packed value.
+ * @uval: Pointer to an u64 holding the unpacked value.
+ * @startbit: The index (in logical notation, compensated for quirks) where
+ *	      the packed value starts within pbuf. Must be larger than, or
+ *	      equal to, endbit.
+ * @endbit: The index (in logical notation, compensated for quirks) where
+ *	    the packed value ends within pbuf. Must be smaller than, or equal
+ *	    to, startbit.
+ * @pbuflen: The length in bytes of the packed buffer pointed to by @pbuf.
+ * @quirks: A bit mask of QUIRK_LITTLE_ENDIAN, QUIRK_LSW32_IS_FIRST and
+ *	    QUIRK_MSB_ON_THE_RIGHT.
+ *
+ * Return: 0 on success, EINVAL or ERANGE if called incorrectly. Assuming
+ *	   correct usage, return code may be discarded. The @uval will be
+ *	   modified on success.
+ */
+int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
+	   size_t pbuflen, u8 quirks)
+{
+	/* width of the field to access in the pbuf */
+	u64 value_width;
+
+	/* startbit is expected to be larger than endbit, and both are
+	 * expected to be within the logically addressable range of the buffer.
+	 */
+	if (startbit < endbit || startbit >= BITS_PER_BYTE * pbuflen)
+		/* Invalid function call */
+		return -EINVAL;
+
+	value_width = startbit - endbit + 1;
+	if (value_width > 64)
+		return -ERANGE;
+
+	__unpack(pbuf, uval, startbit, endbit, pbuflen, quirks);
+
 	return 0;
 }
 EXPORT_SYMBOL(unpack);