linux-kernel - [PATCH][next] scsi: isci: Avoid -Wflex-array-member-not-at-end warning

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Message-ID: <aM09bpl1xj9KZSZl@kspp>
Date: Fri, 19 Sep 2025 13:24:30 +0200
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] scsi: isci: Avoid -Wflex-array-member-not-at-end
 warning

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Move the conflicting declaration (which happens to be in a union,
so we're moving the entire union) to the end of the corresponding
structure. Notice that `struct ssp_response_iu` is a flexible
structure, this is a structure that contains a flexible-array member.

With these changes fix the following warning:

drivers/scsi/isci/task.h:92:11: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/scsi/isci/task.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/isci/task.h b/drivers/scsi/isci/task.h
index f96633fa6939..d05d09c1263d 100644
--- a/drivers/scsi/isci/task.h
+++ b/drivers/scsi/isci/task.h
@@ -85,15 +85,17 @@ struct isci_tmf {
 
 	struct completion *complete;
 	enum sas_protocol proto;
+	unsigned char lun[8];
+	u16 io_tag;
+	enum isci_tmf_function_codes tmf_code;
+	int status;
+
+	/* Must be last --ends in a flexible-array member. */
 	union {
 		struct ssp_response_iu resp_iu;
 		struct dev_to_host_fis d2h_fis;
 		u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
 	} resp;
-	unsigned char lun[8];
-	u16 io_tag;
-	enum isci_tmf_function_codes tmf_code;
-	int status;
 };
 
 static inline void isci_print_tmf(struct isci_host *ihost, struct isci_tmf *tmf)
-- 
2.43.0