linux-hardening - [PATCH][next] drm/amdgpu/amdkfd: Avoid a couple hundred -Wflex-array-member-not-at-end warnings

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Message-ID: <aLF5vQv9P_vp0R6_@kspp>
Date: Fri, 29 Aug 2025 11:58:21 +0200
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Felix Kuehling <Felix.Kuehling@....com>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] drm/amdgpu/amdkfd: Avoid a couple hundred
 -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. Notice that `struct dev_pagemap` is a flexible structure,
this is a structure that contains a flexible-array member.

Fix 283 of the following type of warnings:
    283 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h:111:28: 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/gpu/drm/amd/amdgpu/amdgpu.h        | 8 +++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index ddd472e56f69..24f3e5cfbe5d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1155,9 +1155,6 @@ struct amdgpu_device {
 	/* for userq and VM fences */
 	struct amdgpu_seq64		seq64;
 
-	/* KFD */
-	struct amdgpu_kfd_dev		kfd;
-
 	/* UMC */
 	struct amdgpu_umc		umc;
 
@@ -1320,6 +1317,11 @@ struct amdgpu_device {
 	struct mutex                    userq_mutex;
 	bool                            userq_halt_for_enforce_isolation;
 	struct amdgpu_uid *uid_info;
+
+	/* KFD
+	 * Must be last --ends in a flexible-array member.
+	 */
+	struct amdgpu_kfd_dev		kfd;
 };
 
 static inline uint32_t amdgpu_ip_version(const struct amdgpu_device *adev,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index 33eb4826b58b..127927b16ee2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -107,11 +107,13 @@ struct amdgpu_kfd_dev {
 	bool init_complete;
 	struct work_struct reset_work;
 
-	/* HMM page migration MEMORY_DEVICE_PRIVATE mapping */
-	struct dev_pagemap pgmap;
-
 	/* Client for KFD BO GEM handle allocations */
 	struct drm_client_dev client;
+
+	/* HMM page migration MEMORY_DEVICE_PRIVATE mapping
+	 * Must be last --ends in a flexible-array member.
+	 */
+	struct dev_pagemap pgmap;
 };
 
 enum kgd_engine_type {
-- 
2.43.0