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| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2021-03-24 18:00:36 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-04-01 23:03:00 -0400 |
| commit | ed46ccc7fe7612eb3763346dc0389d8206f071ef (patch) | |
| tree | 82785e85902a9b18cdff6bac04d5e4dfe4eeae81 /drivers/message | |
| parent | 5b11c9d80bde81f6896cc85b23aeaa9502a704ed (diff) | |
| download | lwn-ed46ccc7fe7612eb3763346dc0389d8206f071ef.tar.gz lwn-ed46ccc7fe7612eb3763346dc0389d8206f071ef.zip | |
scsi: message: fusion: Replace one-element array with flexible-array member
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].
Also, this helps with the ongoing efforts to enable -Warray-bounds by
fixing the following warning:
drivers/message/fusion/mptbase.c: In function ‘mptbase_reply’:
drivers/message/fusion/mptbase.c:7747:62: warning: array subscript 1 is above array bounds of ‘U32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
7747 | ioc->events[idx].data[ii] = le32_to_cpu(pEventReply->Data[ii]);
./include/uapi/linux/byteorder/little_endian.h:34:51: note: in definition of macro ‘__le32_to_cpu’
34 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
drivers/message/fusion/mptbase.c:7747:33: note: in expansion of macro ‘le32_to_cpu’
7747 | ioc->events[idx].data[ii] = le32_to_cpu(pEventReply->Data[ii]);
|
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109
Link: https://lore.kernel.org/r/20210324230036.GA67851@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/message')
| -rw-r--r-- | drivers/message/fusion/lsi/mpi_ioc.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/message/fusion/lsi/mpi_ioc.h b/drivers/message/fusion/lsi/mpi_ioc.h index c249f2994fc1..1534460fd5b1 100644 --- a/drivers/message/fusion/lsi/mpi_ioc.h +++ b/drivers/message/fusion/lsi/mpi_ioc.h @@ -448,7 +448,7 @@ typedef struct _MSG_EVENT_NOTIFY_REPLY U32 IOCLogInfo; /* 10h */ U32 Event; /* 14h */ U32 EventContext; /* 18h */ - U32 Data[1]; /* 1Ch */ + U32 Data[]; /* 1Ch */ } MSG_EVENT_NOTIFY_REPLY, MPI_POINTER PTR_MSG_EVENT_NOTIFY_REPLY, EventNotificationReply_t, MPI_POINTER pEventNotificationReply_t; |