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