linux-kernel - [PATCH][next] scsi: hisi_sas: Avoid a couple -Wflex-array-member-not-at-end warnings

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Message-ID: <aM1J5UemZFgdso3F@kspp>
Date: Fri, 19 Sep 2025 14:17:41 +0200
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Yihang Li <liyihang9@...artners.com>,
	"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: hisi_sas: Avoid a couple
 -Wflex-array-member-not-at-end warnings

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

Move the conflicting declarations to the end of the corresponding
structures (and in a union). Notice that `struct ssp_command_iu`
is a flexible structure, this is a structure that contains a
flexible-array member.

With these changes fix the following warnings:

drivers/scsi/hisi_sas/hisi_sas.h:639:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
drivers/scsi/hisi_sas/hisi_sas.h:616:47: 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/hisi_sas/hisi_sas.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 1323ed8aa717..55c638dd58b1 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -613,8 +613,8 @@ struct hisi_sas_command_table_ssp {
 	struct ssp_frame_hdr hdr;
 	union {
 		struct {
-			struct ssp_command_iu task;
 			u32 prot[PROT_BUF_SIZE];
+			struct ssp_command_iu task;
 		};
 		struct ssp_tmf_iu ssp_task;
 		struct xfer_rdy_iu xfer_rdy;
@@ -636,13 +636,17 @@ struct hisi_sas_status_buffer {
 
 struct hisi_sas_slot_buf_table {
 	struct hisi_sas_status_buffer status_buffer;
-	union hisi_sas_command_table command_header;
 	struct hisi_sas_sge_page sge_page;
+
+	/* Must be last --ends in a flexible-array member. */
+	union hisi_sas_command_table command_header;
 };
 
 struct hisi_sas_slot_dif_buf_table {
-	struct hisi_sas_slot_buf_table slot_buf;
 	struct hisi_sas_sge_dif_page sge_dif_page;
+
+	/* Must be last --ends in a flexible-array member. */
+	struct hisi_sas_slot_buf_table slot_buf;
 };
 
 extern struct scsi_transport_template *hisi_sas_stt;
-- 
2.43.0