drm/sched: Remove a hole from struct drm_sched_job

We can re-order some struct members and take u32 credits outside of the
pointer sandwich and also for the last_dependency member we can get away
with an unsigned int since for dependency we use xa_limit_32b.

Pahole report before:
        /* size: 160, cachelines: 3, members: 14 */
        /* sum members: 156, holes: 1, sum holes: 4 */
        /* last cacheline: 32 bytes */

And after:
        /* size: 152, cachelines: 3, members: 14 */
        /* last cacheline: 24 bytes */

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Philipp Stanner <phasta@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250221105038.79665-4-tvrtko.ursulin@igalia.com

Author: Tvrtko Ursulin

include/drm/gpu_scheduler.h

@@ -338,8 +338,14 @@ struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f);
  * to schedule the job.
  */
 struct drm_sched_job {
-	struct spsc_node		queue_node;
-	struct list_head		list;
+	u64				id;
+
+	/**
+	 * @submit_ts:
+	 *
+	 * When the job was pushed into the entity queue.
+	 */
+	ktime_t                         submit_ts;
 
 	/**
 	 * @sched:
@@ -349,24 +355,30 @@ struct drm_sched_job {
 	 * has finished.
 	 */
 	struct drm_gpu_scheduler	*sched;
+
 	struct drm_sched_fence		*s_fence;
+	struct drm_sched_entity         *entity;
 
+	enum drm_sched_priority		s_priority;
 	u32				credits;
+	/** @last_dependency: tracks @dependencies as they signal */
+	unsigned int			last_dependency;
+	atomic_t			karma;
+
+	struct spsc_node		queue_node;
+	struct list_head		list;
 
 	/*
 	 * work is used only after finish_cb has been used and will not be
 	 * accessed anymore.
 	 */
 	union {
-		struct dma_fence_cb		finish_cb;
-		struct work_struct		work;
+		struct dma_fence_cb	finish_cb;
+		struct work_struct	work;
 	};
 
-	uint64_t			id;
-	atomic_t			karma;
-	enum drm_sched_priority		s_priority;
-	struct drm_sched_entity         *entity;
 	struct dma_fence_cb		cb;
+
 	/**
 	 * @dependencies:
 	 *
@@ -375,16 +387,6 @@ struct drm_sched_job {
 	 * drm_sched_job_add_implicit_dependencies().
 	 */
 	struct xarray			dependencies;
-
-	/** @last_dependency: tracks @dependencies as they signal */
-	unsigned long			last_dependency;
-
-	/**
-	 * @submit_ts:
-	 *
-	 * When the job was pushed into the entity queue.
-	 */
-	ktime_t                         submit_ts;
 };
 
 static inline bool drm_sched_invalidate_job(struct drm_sched_job *s_job,