Re: [PATCH] drm/nouveau: Constify struct nouveau_job_ops

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On 6/14/24 18:08, Christophe JAILLET wrote:
"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@xxxxxxxxxx>

Applied to drm-misc-next, thanks!

---
  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,





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