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https://gitee.com/bianbu-linux/linux-6.6
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94dfc73e7c
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].
This code was transformed with the help of Coccinelle:
(linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
@@
identifier S, member, array;
type T1, T2;
@@
struct S {
...
T1 member;
T2 array[
- 0
];
};
-fstrict-flex-arrays=3 is coming and we need to land these changes
to prevent issues like these in the short future:
../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
but the source string has length 2 (including NUL byte) [-Wfortify-source]
strcpy(de3->name, ".");
^
Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
this breaks anything, we can use a union with a new member name.
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/78
Build-tested-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
Acked-by: Dan Williams <dan.j.williams@intel.com> # For ndctl.h
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
105 lines
4 KiB
C
105 lines
4 KiB
C
/* SPDX-License-Identifier: ((GPL-2.0-only WITH Linux-syscall-note) OR BSD-3-Clause) */
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/*
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* linux/can/bcm.h
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*
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* Definitions for CAN Broadcast Manager (BCM)
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*
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* Author: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
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* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Volkswagen nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* The provided data structures and external interfaces from this code
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* are not restricted to be used by modules with a GPL compatible license.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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#ifndef _UAPI_CAN_BCM_H
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#define _UAPI_CAN_BCM_H
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#include <linux/types.h>
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#include <linux/can.h>
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struct bcm_timeval {
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long tv_sec;
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long tv_usec;
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};
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/**
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* struct bcm_msg_head - head of messages to/from the broadcast manager
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* @opcode: opcode, see enum below.
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* @flags: special flags, see below.
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* @count: number of frames to send before changing interval.
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* @ival1: interval for the first @count frames.
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* @ival2: interval for the following frames.
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* @can_id: CAN ID of frames to be sent or received.
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* @nframes: number of frames appended to the message head.
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* @frames: array of CAN frames.
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*/
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struct bcm_msg_head {
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__u32 opcode;
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__u32 flags;
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__u32 count;
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struct bcm_timeval ival1, ival2;
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canid_t can_id;
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__u32 nframes;
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struct can_frame frames[];
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};
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enum {
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TX_SETUP = 1, /* create (cyclic) transmission task */
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TX_DELETE, /* remove (cyclic) transmission task */
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TX_READ, /* read properties of (cyclic) transmission task */
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TX_SEND, /* send one CAN frame */
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RX_SETUP, /* create RX content filter subscription */
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RX_DELETE, /* remove RX content filter subscription */
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RX_READ, /* read properties of RX content filter subscription */
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TX_STATUS, /* reply to TX_READ request */
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TX_EXPIRED, /* notification on performed transmissions (count=0) */
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RX_STATUS, /* reply to RX_READ request */
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RX_TIMEOUT, /* cyclic message is absent */
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RX_CHANGED /* updated CAN frame (detected content change) */
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};
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#define SETTIMER 0x0001
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#define STARTTIMER 0x0002
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#define TX_COUNTEVT 0x0004
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#define TX_ANNOUNCE 0x0008
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#define TX_CP_CAN_ID 0x0010
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#define RX_FILTER_ID 0x0020
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#define RX_CHECK_DLC 0x0040
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#define RX_NO_AUTOTIMER 0x0080
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#define RX_ANNOUNCE_RESUME 0x0100
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#define TX_RESET_MULTI_IDX 0x0200
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#define RX_RTR_FRAME 0x0400
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#define CAN_FD_FRAME 0x0800
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#endif /* !_UAPI_CAN_BCM_H */
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