[PATCH 1/5] sched_ext: Remove deprecated SCX_OPS_HAS_CGROUP_WEIGHT flag

[zhidao su <soolaugust@gmail.com>]

From: Su Zhidao <suzhidao@xiaomi.com>

SCX_OPS_HAS_CGROUP_WEIGHT was deprecated in 6.15 with a comment
'will be removed on 6.18'. Now that we are at 6.18, remove it.

The flag was a no-op and only triggered a pr_warn() on use. Remove
the flag definition, the warning, and update scx_flatcg which was
the last in-tree user.

Signed-off-by: Su Zhidao <suzhidao@xiaomi.com>
---
 kernel/sched/ext.c                              | 3 ---
 kernel/sched/ext_internal.h                     | 8 +-------
 tools/sched_ext/include/scx/enum_defs.autogen.h | 1 -
 tools/sched_ext/scx_flatcg.bpf.c                | 2 +-
 4 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index c4ccd685259f..56ff5874af94 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -5061,9 +5061,6 @@ static int validate_ops(struct scx_sched *sch, const struct sched_ext_ops *ops)
 		return -EINVAL;
 	}
 
-	if (ops->flags & SCX_OPS_HAS_CGROUP_WEIGHT)
-		pr_warn("SCX_OPS_HAS_CGROUP_WEIGHT is deprecated and a noop\n");
-
 	if (ops->cpu_acquire || ops->cpu_release)
 		pr_warn("ops->cpu_acquire/release() are deprecated, use sched_switch TP instead\n");
 
diff --git a/kernel/sched/ext_internal.h b/kernel/sched/ext_internal.h
index bd26811fea99..3c86c53e1975 100644
--- a/kernel/sched/ext_internal.h
+++ b/kernel/sched/ext_internal.h
@@ -174,19 +174,13 @@ enum scx_ops_flags {
 	 */
 	SCX_OPS_BUILTIN_IDLE_PER_NODE	= 1LLU << 6,
 
-	/*
-	 * CPU cgroup support flags
-	 */
-	SCX_OPS_HAS_CGROUP_WEIGHT	= 1LLU << 16,	/* DEPRECATED, will be removed on 6.18 */
-
 	SCX_OPS_ALL_FLAGS		= SCX_OPS_KEEP_BUILTIN_IDLE |
 					  SCX_OPS_ENQ_LAST |
 					  SCX_OPS_ENQ_EXITING |
 					  SCX_OPS_ENQ_MIGRATION_DISABLED |
 					  SCX_OPS_ALLOW_QUEUED_WAKEUP |
 					  SCX_OPS_SWITCH_PARTIAL |
-					  SCX_OPS_BUILTIN_IDLE_PER_NODE |
-					  SCX_OPS_HAS_CGROUP_WEIGHT,
+					  SCX_OPS_BUILTIN_IDLE_PER_NODE,
 
 	/* high 8 bits are internal, don't include in SCX_OPS_ALL_FLAGS */
 	__SCX_OPS_INTERNAL_MASK		= 0xffLLU << 56,
diff --git a/tools/sched_ext/include/scx/enum_defs.autogen.h b/tools/sched_ext/include/scx/enum_defs.autogen.h
index dcc945304760..80c885f781ba 100644
--- a/tools/sched_ext/include/scx/enum_defs.autogen.h
+++ b/tools/sched_ext/include/scx/enum_defs.autogen.h
@@ -91,7 +91,6 @@
 #define HAVE_SCX_OPS_SWITCH_PARTIAL
 #define HAVE_SCX_OPS_ENQ_MIGRATION_DISABLED
 #define HAVE_SCX_OPS_ALLOW_QUEUED_WAKEUP
-#define HAVE_SCX_OPS_HAS_CGROUP_WEIGHT
 #define HAVE_SCX_OPS_ALL_FLAGS
 #define HAVE_SCX_OPSS_NONE
 #define HAVE_SCX_OPSS_QUEUEING
diff --git a/tools/sched_ext/scx_flatcg.bpf.c b/tools/sched_ext/scx_flatcg.bpf.c
index 0e785cff0f24..a8a9234bb41e 100644
--- a/tools/sched_ext/scx_flatcg.bpf.c
+++ b/tools/sched_ext/scx_flatcg.bpf.c
@@ -960,5 +960,5 @@ SCX_OPS_DEFINE(flatcg_ops,
 	       .cgroup_move		= (void *)fcg_cgroup_move,
 	       .init			= (void *)fcg_init,
 	       .exit			= (void *)fcg_exit,
-	       .flags			= SCX_OPS_HAS_CGROUP_WEIGHT | SCX_OPS_ENQ_EXITING,
+	       .flags			= SCX_OPS_ENQ_EXITING,
 	       .name			= "flatcg");
-- 
2.43.0