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crypto: qat - Avoid -Wflex-array-member-not-at-end warnings

PATCH In review Gustavo A. R. Silva 3 participants 3 messages Mar 25, 2024 – Apr 5, 2024

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Gustavo A. R. Silva

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PATCH 1/1 crypto: qat - Avoid -Wflex-array-member-not-at-end warnings

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

Use the __struct_group() helper to separate the flexible array from the rest of the members in flexible struct qat_alg_buf_list, through tagged struct qat_alg_buf_list_hdr, and avoid embedding the flexible-array member in the middle of struct qat_alg_fixed_buf_list.

Also, use container_of() whenever we need to retrieve a pointer to the flexible structure.

So, with these changes, fix the following warnings:
drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Link https://github.com/KSPP/linux/issues/202
Signed-off-by Gustavo A. R. Silva <[email protected]>
---
 drivers/crypto/intel/qat/qat_common/qat_bl.c |  6 ++++--
 drivers/crypto/intel/qat/qat_common/qat_bl.h | 11 +++++++----
 2 files changed, 11 insertions(+), 6 deletions(-)
drivers/crypto/intel/qat/qat_common/qat_bl.c +4 -2
index 76baed0a76c0..338acf29c487 100644
@@ -81,7 +81,8 @@ static int __qat_bl_sgl_to_bufl(struct adf_accel_dev *accel_dev,
 		if (unlikely(!bufl))
 			return -ENOMEM;
 	} else {
-		bufl = &buf->sgl_src.sgl_hdr;
+		bufl = container_of(&buf->sgl_src.sgl_hdr,
+				    struct qat_alg_buf_list, hdr);
 		memset(bufl, 0, sizeof(struct qat_alg_buf_list));
 		buf->sgl_src_valid = true;
 	}

@@ -139,7 +140,8 @@ static int __qat_bl_sgl_to_bufl(struct adf_accel_dev *accel_dev,
 			if (unlikely(!buflout))
 				goto err_in;
 		} else {
-			buflout = &buf->sgl_dst.sgl_hdr;
+			buflout = container_of(&buf->sgl_dst.sgl_hdr,
+					       struct qat_alg_buf_list, hdr);
 			memset(buflout, 0, sizeof(struct qat_alg_buf_list));
 			buf->sgl_dst_valid = true;
 		}
drivers/crypto/intel/qat/qat_common/qat_bl.h +7 -4
index d87e4f35ac39..85bc32a9ec0e 100644
@@ -15,14 +15,17 @@ struct qat_alg_buf {
 } __packed;
 
 struct qat_alg_buf_list {
-	u64 resrvd;
-	u32 num_bufs;
-	u32 num_mapped_bufs;
+	/* New members must be added within the __struct_group() macro below. */
+	__struct_group(qat_alg_buf_list_hdr, hdr, __packed,
+		u64 resrvd;
+		u32 num_bufs;
+		u32 num_mapped_bufs;
+	);
 	struct qat_alg_buf buffers[];
 } __packed;
 
 struct qat_alg_fixed_buf_list {
-	struct qat_alg_buf_list sgl_hdr;
+	struct qat_alg_buf_list_hdr sgl_hdr;
 	struct qat_alg_buf descriptors[QAT_MAX_BUFF_DESC];
 } __packed __aligned(64);
Signature · 1 line
2.34.1
maintainer Acked-by on v1 1/1
#1 lore raw
Quoted 21 lines · Gustavo A. R. Silva

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

Use the __struct_group() helper to separate the flexible array from the rest of the members in flexible struct qat_alg_buf_list, through tagged struct qat_alg_buf_list_hdr, and avoid embedding the flexible-array member in the middle of struct qat_alg_fixed_buf_list.

Also, use container_of() whenever we need to retrieve a pointer to the flexible structure.

So, with these changes, fix the following warnings:
drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Quoted 2 lines
Link https://github.com/KSPP/linux/issues/202
Signed-off-by Gustavo A. R. Silva <[email protected]>
Acked-by Giovanni Cabiddu <[email protected]>

Regards,

Signature · 1 line
Giovanni
maintainer
#2 lore raw
In reply to Gustavo A. R. Silva
Quoted 21 lines · Gustavo A. R. Silva

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

Use the __struct_group() helper to separate the flexible array from the rest of the members in flexible struct qat_alg_buf_list, through tagged struct qat_alg_buf_list_hdr, and avoid embedding the flexible-array member in the middle of struct qat_alg_fixed_buf_list.

Also, use container_of() whenever we need to retrieve a pointer to the flexible structure.

So, with these changes, fix the following warnings:
drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Quoted 6 lines
Link https://github.com/KSPP/linux/issues/202
Signed-off-by Gustavo A. R. Silva <[email protected]>

---
drivers/crypto/intel/qat/qat_common/qat_bl.c | 6 ++++-- drivers/crypto/intel/qat/qat_common/qat_bl.h | 11 +++++++----

2 files changed, 11 insertions(+), 6 deletions(-)

Patch applied. Thanks.

Signature · 3 lines
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt