linux-kernel - [PATCH 1/4] drm/amdgpu: Explicitly add a flexible array at the end of 'struct amdgpu_bo

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Message-Id: <247e082be64febc32a3404a9ea42acca91156ed0.1692524665.git.christophe.jaillet@wanadoo.fr>
Date:   Sun, 20 Aug 2023 11:51:13 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        Felix.Kuehling@....com, Arunpravin.PaneerSelvam@....com
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 1/4] drm/amdgpu: Explicitly add a flexible array at the end of 'struct amdgpu_bo_list'

'struct amdgpu_bo_list' is really used as if it was ended by a flex array.
So make it more explicit and add a 'struct amdgpu_bo_list_entry entries[]'
field at the end of the structure.

This way, struct_size() can be used when it is allocated.
It is less verbose.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c | 5 +----
 drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h | 2 ++
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
index b6298e901cbd..571fed04eb7a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
@@ -75,7 +75,6 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
 	struct amdgpu_bo_list_entry *array;
 	struct amdgpu_bo_list *list;
 	uint64_t total_size = 0;
-	size_t size;
 	unsigned i;
 	int r;
 
@@ -83,9 +82,7 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
 				/ sizeof(struct amdgpu_bo_list_entry))
 		return -EINVAL;
 
-	size = sizeof(struct amdgpu_bo_list);
-	size += num_entries * sizeof(struct amdgpu_bo_list_entry);
-	list = kvmalloc(size, GFP_KERNEL);
+	list = kvmalloc(struct_size(list, entries, num_entries), GFP_KERNEL);
 	if (!list)
 		return -ENOMEM;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
index 26c01cb131f2..368e50b30160 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
@@ -55,6 +55,8 @@ struct amdgpu_bo_list {
 	/* Protect access during command submission.
 	 */
 	struct mutex bo_list_mutex;
+
+	struct amdgpu_bo_list_entry entries[];
 };
 
 int amdgpu_bo_list_get(struct amdgpu_fpriv *fpriv, int id,
-- 
2.34.1