netdev - [PATCH net-next 09/10] lib: packing: use BITS_PER

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Message-Id: <20240930-packing-kunit-tests-and-split-pack-unpack-v1-9-94b1f04aca85@intel.com>
Date: Mon, 30 Sep 2024 16:19:42 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 Vladimir Oltean <olteanv@...il.com>, 
 "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Jacob Keller <jacob.e.keller@...el.com>, 
 Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH net-next 09/10] lib: packing: use BITS_PER_BYTE instead of
 8

From: Vladimir Oltean <vladimir.oltean@....com>

This helps clarify what the 8 is for.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
---
 lib/packing.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/lib/packing.c b/lib/packing.c
index 9efe57d347c7..ac1f36c56a77 100644
--- a/lib/packing.c
+++ b/lib/packing.c
@@ -83,7 +83,7 @@ int pack(void *pbuf, u64 uval, size_t startbit, size_t endbit, size_t pbuflen,
 	/* 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 >= 8 * pbuflen))
+	if (unlikely(startbit < endbit || startbit >= BITS_PER_BYTE * pbuflen))
 		/* Invalid function call */
 		return -EINVAL;
 
@@ -106,8 +106,8 @@ int pack(void *pbuf, u64 uval, size_t startbit, size_t endbit, size_t pbuflen,
 	 * 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 / 8;
-	plogical_last_u8  = endbit / 8;
+	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 */
@@ -123,11 +123,11 @@ int pack(void *pbuf, u64 uval, size_t startbit, size_t endbit, size_t pbuflen,
 		 * input arguments startbit and endbit.
 		 */
 		if (box == plogical_first_u8)
-			box_start_bit = startbit % 8;
+			box_start_bit = startbit % BITS_PER_BYTE;
 		else
 			box_start_bit = 7;
 		if (box == plogical_last_u8)
-			box_end_bit = endbit % 8;
+			box_end_bit = endbit % BITS_PER_BYTE;
 		else
 			box_end_bit = 0;
 
@@ -138,8 +138,8 @@ int pack(void *pbuf, u64 uval, size_t startbit, size_t endbit, size_t pbuflen,
 		 * box is u8, the projection is u64 because it may fall
 		 * anywhere within the unpacked u64.
 		 */
-		proj_start_bit = ((box * 8) + box_start_bit) - endbit;
-		proj_end_bit   = ((box * 8) + box_end_bit) - endbit;
+		proj_start_bit = ((box * BITS_PER_BYTE) + box_start_bit) - endbit;
+		proj_end_bit = ((box * BITS_PER_BYTE) + box_end_bit) - endbit;
 		proj_mask = GENMASK_ULL(proj_start_bit, proj_end_bit);
 		box_mask  = GENMASK_ULL(box_start_bit, box_end_bit);
 
@@ -199,7 +199,7 @@ int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
 	/* 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 >= 8 * pbuflen))
+	if (unlikely(startbit < endbit || startbit >= BITS_PER_BYTE * pbuflen))
 		/* Invalid function call */
 		return -EINVAL;
 
@@ -214,8 +214,8 @@ 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 / 8;
-	plogical_last_u8  = endbit / 8;
+	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 */
@@ -231,11 +231,11 @@ int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
 		 * input arguments startbit and endbit.
 		 */
 		if (box == plogical_first_u8)
-			box_start_bit = startbit % 8;
+			box_start_bit = startbit % BITS_PER_BYTE;
 		else
 			box_start_bit = 7;
 		if (box == plogical_last_u8)
-			box_end_bit = endbit % 8;
+			box_end_bit = endbit % BITS_PER_BYTE;
 		else
 			box_end_bit = 0;
 
@@ -246,8 +246,8 @@ int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit,
 		 * box is u8, the projection is u64 because it may fall
 		 * anywhere within the unpacked u64.
 		 */
-		proj_start_bit = ((box * 8) + box_start_bit) - endbit;
-		proj_end_bit   = ((box * 8) + box_end_bit) - endbit;
+		proj_start_bit = ((box * BITS_PER_BYTE) + box_start_bit) - endbit;
+		proj_end_bit = ((box * BITS_PER_BYTE) + box_end_bit) - endbit;
 		proj_mask = GENMASK_ULL(proj_start_bit, proj_end_bit);
 		box_mask  = GENMASK_ULL(box_start_bit, box_end_bit);
 

-- 
2.46.2.828.g9e56e24342b6