mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Gustavo A. R. Silva](/assets/img/avatar_default.png)
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>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
/*
|
|
* System Trace Module (STM) userspace interfaces
|
|
* Copyright (c) 2014, Intel Corporation.
|
|
*
|
|
* STM class implements generic infrastructure for System Trace Module devices
|
|
* as defined in MIPI STPv2 specification.
|
|
*/
|
|
|
|
#ifndef _UAPI_LINUX_STM_H
|
|
#define _UAPI_LINUX_STM_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
/* Maximum allowed master and channel values */
|
|
#define STP_MASTER_MAX 0xffff
|
|
#define STP_CHANNEL_MAX 0xffff
|
|
|
|
/**
|
|
* struct stp_policy_id - identification for the STP policy
|
|
* @size: size of the structure including real id[] length
|
|
* @master: assigned master
|
|
* @channel: first assigned channel
|
|
* @width: number of requested channels
|
|
* @id: identification string
|
|
*
|
|
* User must calculate the total size of the structure and put it into
|
|
* @size field, fill out the @id and desired @width. In return, kernel
|
|
* fills out @master, @channel and @width.
|
|
*/
|
|
struct stp_policy_id {
|
|
__u32 size;
|
|
__u16 master;
|
|
__u16 channel;
|
|
__u16 width;
|
|
/* padding */
|
|
__u16 __reserved_0;
|
|
__u32 __reserved_1;
|
|
char id[];
|
|
};
|
|
|
|
#define STP_POLICY_ID_SET _IOWR('%', 0, struct stp_policy_id)
|
|
#define STP_POLICY_ID_GET _IOR('%', 1, struct stp_policy_id)
|
|
#define STP_SET_OPTIONS _IOW('%', 2, __u64)
|
|
|
|
#endif /* _UAPI_LINUX_STM_H */
|