linux-kernel - [PATCH v2 0/3] can: raw: optimize the sizes of struct uniqframe and struct raw

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Message-Id: <20250917-can-raw-repack-v2-0-395e8b3a4437@kernel.org>
Date: Wed, 17 Sep 2025 13:48:23 +0900
From: Vincent Mailhol <mailhol@...nel.org>
To: Oliver Hartkopp <socketcan@...tkopp.net>, 
 Marc Kleine-Budde <mkl@...gutronix.de>
Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Christophe Jaillet <christophe.jaillet@...adoo.fr>, 
 Vincent Mailhol <mailhol@...nel.org>
Subject: [PATCH v2 0/3] can: raw: optimize the sizes of struct uniqframe
 and struct raw_sock

A few bytes can be shaved out of can raw's struct uniqframe and struct
raw_sock.

Patch #1 reorders struct uniqframe fields to save 8 bytes.

Patch #2 and #3 modify struct raw_sock to use bitfields and to reorder
its fields to save 24 bytes in total.

Signed-off-by: Vincent Mailhol <mailhol@...nel.org>
---
Changes in v2:

  - in patch #2 also add raw_sock->bound and raw_sock->join_filters to
    the bitfield.

  - add Oliver's Ack tags.

Link to v1: https://lore.kernel.org/r/20250915-can-raw-repack-v1-0-5ea293bc6d33@kernel.org

---
Vincent Mailhol (3):
      can: raw: reorder struct uniqframe's members to optimise packing
      can: raw: use bitfields to store flags in struct raw_sock
      can: raw: reorder struct raw_sock's members to optimise packing

 net/can/raw.c | 65 ++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 38 insertions(+), 27 deletions(-)
---
base-commit: 5e87fdc37f8dc619549d49ba5c951b369ce7c136
change-id: 20250915-can-raw-repack-c21aab25cc11

Best regards,
-- 
Vincent Mailhol <mailhol@...nel.org>