From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Date: Thu, 8 Aug 2024 16:05:26 -0600
Subject: crypto: qat - Use static_assert() to check struct sizes
Git-commit: 8caa061cfdf65bca9a3ceb4ce2b2b8e5fb98c1e8
Patch-mainline: v6.12-rc1
References: jsc#PED-9963

Commit 140e4c85d540 ("crypto: qat - Avoid -Wflex-array-member-not-at-end
warnings") introduced tagged `struct qat_alg_buf_list_hdr`. We want to
ensure that when new members need to be added to the flexible structure,
they are always included within this tagged struct.

So, we use `static_assert()` to ensure that the memory layout for
both the flexible structure and the tagged struct is the same after
any changes.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/crypto/intel/qat/qat_common/qat_bl.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/intel/qat/qat_common/qat_bl.h b/drivers/crypto/intel/qat/qat_common/qat_bl.h
index 85bc32a9ec0e..3f5b79015400 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_bl.h
+++ b/drivers/crypto/intel/qat/qat_common/qat_bl.h
@@ -23,6 +23,8 @@ struct qat_alg_buf_list {
 	);
 	struct qat_alg_buf buffers[];
 } __packed;
+static_assert(offsetof(struct qat_alg_buf_list, buffers) == sizeof(struct qat_alg_buf_list_hdr),
+	      "struct member likely outside of __struct_group()");
 
 struct qat_alg_fixed_buf_list {
 	struct qat_alg_buf_list_hdr sgl_hdr;

