linux-kernel - [PATCH] drm/nouveau: Constify struct nouveau_job

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Date: Fri, 14 Jun 2024 18:08:30 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Karol Herbst <kherbst@...hat.com>,
	Lyude Paul <lyude@...hat.com>,
	Danilo Krummrich <dakr@...hat.com>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	dri-devel@...ts.freedesktop.org,
	nouveau@...ts.freedesktop.org
Subject: [PATCH] drm/nouveau: Constify struct nouveau_job_ops

"struct nouveau_job_ops" is not modified in these drivers.

Constifying this structure moves some data to a read-only section, so
increase overall security.

In order to do it, "struct nouveau_job" and "struct nouveau_job_args" also
need to be adjusted to this new const qualifier.

On a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
   5570	    152	      0	   5722	   165a	drivers/gpu/drm/nouveau/nouveau_exec.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
   5630	    112	      0	   5742	   166e	drivers/gpu/drm/nouveau/nouveau_exec.o

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_exec.c b/drivers/gpu/drm/nouveau/nouveau_exec.c
index e65c0ef23bc7..a0b5f1b16e8b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_exec.c
+++ b/drivers/gpu/drm/nouveau/nouveau_exec.c
@@ -188,7 +188,7 @@ nouveau_exec_job_timeout(struct nouveau_job *job)
 	return DRM_GPU_SCHED_STAT_NOMINAL;
 }
 
-static struct nouveau_job_ops nouveau_exec_job_ops = {
+static const struct nouveau_job_ops nouveau_exec_job_ops = {
 	.submit = nouveau_exec_job_submit,
 	.armed_submit = nouveau_exec_job_armed_submit,
 	.run = nouveau_exec_job_run,
diff --git a/drivers/gpu/drm/nouveau/nouveau_sched.h b/drivers/gpu/drm/nouveau/nouveau_sched.h
index e1f01a23e6f6..20cd1da8db73 100644
--- a/drivers/gpu/drm/nouveau/nouveau_sched.h
+++ b/drivers/gpu/drm/nouveau/nouveau_sched.h
@@ -42,7 +42,7 @@ struct nouveau_job_args {
 		u32 count;
 	} out_sync;
 
-	struct nouveau_job_ops *ops;
+	const struct nouveau_job_ops *ops;
 };
 
 struct nouveau_job {
@@ -73,7 +73,7 @@ struct nouveau_job {
 		u32 count;
 	} out_sync;
 
-	struct nouveau_job_ops {
+	const struct nouveau_job_ops {
 		/* If .submit() returns without any error, it is guaranteed that
 		 * armed_submit() is called.
 		 */
diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.c b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
index ee02cd833c5e..9402fa320a7e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_uvmm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.c
@@ -1534,7 +1534,7 @@ nouveau_uvmm_bind_job_cleanup(struct nouveau_job *job)
 	nouveau_uvmm_bind_job_put(bind_job);
 }
 
-static struct nouveau_job_ops nouveau_bind_job_ops = {
+static const struct nouveau_job_ops nouveau_bind_job_ops = {
 	.submit = nouveau_uvmm_bind_job_submit,
 	.armed_submit = nouveau_uvmm_bind_job_armed_submit,
 	.run = nouveau_uvmm_bind_job_run,
-- 
2.45.2