[PATCH 1/4] tools/sched_ext: Strip compatibility macros for cgroup and dispatch APIs

[Tejun Heo <tj@kernel.org>]

Enough time has passed since the introduction of scx_bpf_task_cgroup() and
the scx_bpf_dispatch* -> scx_bpf_dsq* kfunc renaming. Strip the compatibility
macros.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
 tools/sched_ext/include/scx/compat.bpf.h | 108 +----------------------
 tools/sched_ext/scx_flatcg.bpf.c         |  10 +--
 tools/sched_ext/scx_qmap.bpf.c           |  14 ++-
 3 files changed, 12 insertions(+), 120 deletions(-)

diff --git a/tools/sched_ext/include/scx/compat.bpf.h b/tools/sched_ext/include/scx/compat.bpf.h
index dd9144624dc9..d979f16a3ae2 100644
--- a/tools/sched_ext/include/scx/compat.bpf.h
+++ b/tools/sched_ext/include/scx/compat.bpf.h
@@ -15,121 +15,17 @@
 	__ret;									\
 })
 
-/* v6.12: 819513666966 ("sched_ext: Add cgroup support") */
-#define __COMPAT_scx_bpf_task_cgroup(p)						\
-	(bpf_ksym_exists(scx_bpf_task_cgroup) ?					\
-	 scx_bpf_task_cgroup((p)) : NULL)
-
 /*
- * v6.13: The verb `dispatch` was too overloaded and confusing. kfuncs are
- * renamed to unload the verb.
- *
- * Build error is triggered if old names are used. New binaries work with both
- * new and old names. The compat macros will be removed on v6.15 release.
+ * v6.15: 950ad93df2fc ("bpf: add kfunc for populating cpumask bits")
  *
- * scx_bpf_dispatch_from_dsq() and friends were added during v6.12 by
- * 4c30f5ce4f7a ("sched_ext: Implement scx_bpf_dispatch[_vtime]_from_dsq()").
- * Preserve __COMPAT macros until v6.15.
+ * Compat macro will be dropped on v6.19 release.
  */
-void scx_bpf_dispatch___compat(struct task_struct *p, u64 dsq_id, u64 slice, u64 enq_flags) __ksym __weak;
-void scx_bpf_dispatch_vtime___compat(struct task_struct *p, u64 dsq_id, u64 slice, u64 vtime, u64 enq_flags) __ksym __weak;
-bool scx_bpf_consume___compat(u64 dsq_id) __ksym __weak;
-void scx_bpf_dispatch_from_dsq_set_slice___compat(struct bpf_iter_scx_dsq *it__iter, u64 slice) __ksym __weak;
-void scx_bpf_dispatch_from_dsq_set_vtime___compat(struct bpf_iter_scx_dsq *it__iter, u64 vtime) __ksym __weak;
-bool scx_bpf_dispatch_from_dsq___compat(struct bpf_iter_scx_dsq *it__iter, struct task_struct *p, u64 dsq_id, u64 enq_flags) __ksym __weak;
-bool scx_bpf_dispatch_vtime_from_dsq___compat(struct bpf_iter_scx_dsq *it__iter, struct task_struct *p, u64 dsq_id, u64 enq_flags) __ksym __weak;
 int bpf_cpumask_populate(struct cpumask *dst, void *src, size_t src__sz) __ksym __weak;
 
-#define scx_bpf_dsq_insert(p, dsq_id, slice, enq_flags)				\
-	(bpf_ksym_exists(scx_bpf_dsq_insert) ?					\
-	 scx_bpf_dsq_insert((p), (dsq_id), (slice), (enq_flags)) :		\
-	 scx_bpf_dispatch___compat((p), (dsq_id), (slice), (enq_flags)))
-
-#define scx_bpf_dsq_insert_vtime(p, dsq_id, slice, vtime, enq_flags)		\
-	(bpf_ksym_exists(scx_bpf_dsq_insert_vtime) ?				\
-	 scx_bpf_dsq_insert_vtime((p), (dsq_id), (slice), (vtime), (enq_flags)) : \
-	 scx_bpf_dispatch_vtime___compat((p), (dsq_id), (slice), (vtime), (enq_flags)))
-
-#define scx_bpf_dsq_move_to_local(dsq_id)					\
-	(bpf_ksym_exists(scx_bpf_dsq_move_to_local) ?				\
-	 scx_bpf_dsq_move_to_local((dsq_id)) :					\
-	 scx_bpf_consume___compat((dsq_id)))
-
-#define __COMPAT_scx_bpf_dsq_move_set_slice(it__iter, slice)			\
-	(bpf_ksym_exists(scx_bpf_dsq_move_set_slice) ?				\
-	 scx_bpf_dsq_move_set_slice((it__iter), (slice)) :			\
-	 (bpf_ksym_exists(scx_bpf_dispatch_from_dsq_set_slice___compat) ?	\
-	  scx_bpf_dispatch_from_dsq_set_slice___compat((it__iter), (slice)) :	\
-	  (void)0))
-
-#define __COMPAT_scx_bpf_dsq_move_set_vtime(it__iter, vtime)			\
-	(bpf_ksym_exists(scx_bpf_dsq_move_set_vtime) ?				\
-	 scx_bpf_dsq_move_set_vtime((it__iter), (vtime)) :			\
-	 (bpf_ksym_exists(scx_bpf_dispatch_from_dsq_set_vtime___compat) ?	\
-	  scx_bpf_dispatch_from_dsq_set_vtime___compat((it__iter), (vtime)) :	\
-	  (void) 0))
-
-#define __COMPAT_scx_bpf_dsq_move(it__iter, p, dsq_id, enq_flags)		\
-	(bpf_ksym_exists(scx_bpf_dsq_move) ?					\
-	 scx_bpf_dsq_move((it__iter), (p), (dsq_id), (enq_flags)) :		\
-	 (bpf_ksym_exists(scx_bpf_dispatch_from_dsq___compat) ?			\
-	  scx_bpf_dispatch_from_dsq___compat((it__iter), (p), (dsq_id), (enq_flags)) : \
-	  false))
-
-#define __COMPAT_scx_bpf_dsq_move_vtime(it__iter, p, dsq_id, enq_flags)		\
-	(bpf_ksym_exists(scx_bpf_dsq_move_vtime) ?				\
-	 scx_bpf_dsq_move_vtime((it__iter), (p), (dsq_id), (enq_flags)) :	\
-	 (bpf_ksym_exists(scx_bpf_dispatch_vtime_from_dsq___compat) ?		\
-	  scx_bpf_dispatch_vtime_from_dsq___compat((it__iter), (p), (dsq_id), (enq_flags)) : \
-	  false))
-
 #define __COMPAT_bpf_cpumask_populate(cpumask, src, size__sz)		\
 	(bpf_ksym_exists(bpf_cpumask_populate) ?			\
 	 (bpf_cpumask_populate(cpumask, src, size__sz)) : -EOPNOTSUPP)
 
-#define scx_bpf_dispatch(p, dsq_id, slice, enq_flags)				\
-	_Static_assert(false, "scx_bpf_dispatch() renamed to scx_bpf_dsq_insert()")
-
-#define scx_bpf_dispatch_vtime(p, dsq_id, slice, vtime, enq_flags)		\
-	_Static_assert(false, "scx_bpf_dispatch_vtime() renamed to scx_bpf_dsq_insert_vtime()")
-
-#define scx_bpf_consume(dsq_id) ({						\
-	_Static_assert(false, "scx_bpf_consume() renamed to scx_bpf_dsq_move_to_local()"); \
-	false;									\
-})
-
-#define scx_bpf_dispatch_from_dsq_set_slice(it__iter, slice)		\
-	_Static_assert(false, "scx_bpf_dispatch_from_dsq_set_slice() renamed to scx_bpf_dsq_move_set_slice()")
-
-#define scx_bpf_dispatch_from_dsq_set_vtime(it__iter, vtime)		\
-	_Static_assert(false, "scx_bpf_dispatch_from_dsq_set_vtime() renamed to scx_bpf_dsq_move_set_vtime()")
-
-#define scx_bpf_dispatch_from_dsq(it__iter, p, dsq_id, enq_flags) ({	\
-	_Static_assert(false, "scx_bpf_dispatch_from_dsq() renamed to scx_bpf_dsq_move()"); \
-	false;									\
-})
-
-#define scx_bpf_dispatch_vtime_from_dsq(it__iter, p, dsq_id, enq_flags) ({  \
-	_Static_assert(false, "scx_bpf_dispatch_vtime_from_dsq() renamed to scx_bpf_dsq_move_vtime()"); \
-	false;									\
-})
-
-#define __COMPAT_scx_bpf_dispatch_from_dsq_set_slice(it__iter, slice)		\
-	_Static_assert(false, "__COMPAT_scx_bpf_dispatch_from_dsq_set_slice() renamed to __COMPAT_scx_bpf_dsq_move_set_slice()")
-
-#define __COMPAT_scx_bpf_dispatch_from_dsq_set_vtime(it__iter, vtime)		\
-	_Static_assert(false, "__COMPAT_scx_bpf_dispatch_from_dsq_set_vtime() renamed to __COMPAT_scx_bpf_dsq_move_set_vtime()")
-
-#define __COMPAT_scx_bpf_dispatch_from_dsq(it__iter, p, dsq_id, enq_flags) ({	\
-	_Static_assert(false, "__COMPAT_scx_bpf_dispatch_from_dsq() renamed to __COMPAT_scx_bpf_dsq_move()"); \
-	false;									\
-})
-
-#define __COMPAT_scx_bpf_dispatch_vtime_from_dsq(it__iter, p, dsq_id, enq_flags) ({  \
-	_Static_assert(false, "__COMPAT_scx_bpf_dispatch_vtime_from_dsq() renamed to __COMPAT_scx_bpf_dsq_move_vtime()"); \
-	false;									\
-})
-
 /**
  * __COMPAT_is_enq_cpu_selected - Test if SCX_ENQ_CPU_SELECTED is on
  * in a compatible way. We will preserve this __COMPAT helper until v6.16.
diff --git a/tools/sched_ext/scx_flatcg.bpf.c b/tools/sched_ext/scx_flatcg.bpf.c
index 2c720e3ecad5..43126858b8e4 100644
--- a/tools/sched_ext/scx_flatcg.bpf.c
+++ b/tools/sched_ext/scx_flatcg.bpf.c
@@ -382,7 +382,7 @@ void BPF_STRUCT_OPS(fcg_enqueue, struct task_struct *p, u64 enq_flags)
 		return;
 	}
 
-	cgrp = __COMPAT_scx_bpf_task_cgroup(p);
+	cgrp = scx_bpf_task_cgroup(p);
 	cgc = find_cgrp_ctx(cgrp);
 	if (!cgc)
 		goto out_release;
@@ -508,7 +508,7 @@ void BPF_STRUCT_OPS(fcg_runnable, struct task_struct *p, u64 enq_flags)
 {
 	struct cgroup *cgrp;
 
-	cgrp = __COMPAT_scx_bpf_task_cgroup(p);
+	cgrp = scx_bpf_task_cgroup(p);
 	update_active_weight_sums(cgrp, true);
 	bpf_cgroup_release(cgrp);
 }
@@ -521,7 +521,7 @@ void BPF_STRUCT_OPS(fcg_running, struct task_struct *p)
 	if (fifo_sched)
 		return;
 
-	cgrp = __COMPAT_scx_bpf_task_cgroup(p);
+	cgrp = scx_bpf_task_cgroup(p);
 	cgc = find_cgrp_ctx(cgrp);
 	if (cgc) {
 		/*
@@ -564,7 +564,7 @@ void BPF_STRUCT_OPS(fcg_stopping, struct task_struct *p, bool runnable)
 	if (!taskc->bypassed_at)
 		return;
 
-	cgrp = __COMPAT_scx_bpf_task_cgroup(p);
+	cgrp = scx_bpf_task_cgroup(p);
 	cgc = find_cgrp_ctx(cgrp);
 	if (cgc) {
 		__sync_fetch_and_add(&cgc->cvtime_delta,
@@ -578,7 +578,7 @@ void BPF_STRUCT_OPS(fcg_quiescent, struct task_struct *p, u64 deq_flags)
 {
 	struct cgroup *cgrp;
 
-	cgrp = __COMPAT_scx_bpf_task_cgroup(p);
+	cgrp = scx_bpf_task_cgroup(p);
 	update_active_weight_sums(cgrp, false);
 	bpf_cgroup_release(cgrp);
 }
diff --git a/tools/sched_ext/scx_qmap.bpf.c b/tools/sched_ext/scx_qmap.bpf.c
index 3072b593f898..c67dac78a4c6 100644
--- a/tools/sched_ext/scx_qmap.bpf.c
+++ b/tools/sched_ext/scx_qmap.bpf.c
@@ -320,12 +320,9 @@ static bool dispatch_highpri(bool from_timer)
 
 		if (tctx->highpri) {
 			/* exercise the set_*() and vtime interface too */
-			__COMPAT_scx_bpf_dsq_move_set_slice(
-				BPF_FOR_EACH_ITER, slice_ns * 2);
-			__COMPAT_scx_bpf_dsq_move_set_vtime(
-				BPF_FOR_EACH_ITER, highpri_seq++);
-			__COMPAT_scx_bpf_dsq_move_vtime(
-				BPF_FOR_EACH_ITER, p, HIGHPRI_DSQ, 0);
+			scx_bpf_dsq_move_set_slice(BPF_FOR_EACH_ITER, slice_ns * 2);
+			scx_bpf_dsq_move_set_vtime(BPF_FOR_EACH_ITER, highpri_seq++);
+			scx_bpf_dsq_move_vtime(BPF_FOR_EACH_ITER, p, HIGHPRI_DSQ, 0);
 		}
 	}
 
@@ -342,9 +339,8 @@ static bool dispatch_highpri(bool from_timer)
 		else
 			cpu = scx_bpf_pick_any_cpu(p->cpus_ptr, 0);
 
-		if (__COMPAT_scx_bpf_dsq_move(BPF_FOR_EACH_ITER, p,
-					      SCX_DSQ_LOCAL_ON | cpu,
-					      SCX_ENQ_PREEMPT)) {
+		if (scx_bpf_dsq_move(BPF_FOR_EACH_ITER, p, SCX_DSQ_LOCAL_ON | cpu,
+				     SCX_ENQ_PREEMPT)) {
 			if (cpu == this_cpu) {
 				dispatched = true;
 				__sync_fetch_and_add(&nr_expedited_local, 1);
-- 
2.51.0