sched_ext: Add scx_cgroup_sched() for cgrp->scx_sched reads

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cgrp->scx_sched is __rcu and published with rcu_assign_pointer() but every
reader loads it with a plain access, so sparse flags all of them. The reads
are lock-protected: enable/disable paths rewrite the field under all of
scx_enable_mutex, scx_fork_rwsem and cgroup_mutex, and cgroup creation
inherits the parent's sched under cgroup_mutex before the new cgroup is
reachable, so holding any one of the three locks makes the read stable.

Add scx_cgroup_sched() which states the protection with
rcu_dereference_check() and convert the readers. No functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>

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This commit is contained in:

Tejun Heo 2026-07-23 15:07:56 -10:00

parent 3a21e34eb2

commit 7947442047

3 changed files with 26 additions and 10 deletions

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6

kernel/sched/ext/ext.c

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16

kernel/sched/ext/sub.c

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14

kernel/sched/ext/sub.h

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