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sched_ext: Annotate ksyncs with __rcu in alloc/free_kick_syncs()

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scx_kick_syncs is a per-CPU __rcu pointer, so per_cpu_ptr() returns struct
scx_kick_syncs __rcu **. alloc_kick_syncs() and free_kick_syncs() stored it
in a plain struct scx_kick_syncs **ksyncs, which sparse flags as an __rcu
address-space mismatch. Annotate ksyncs to match. Its accesses already go
through rcu_*_pointer().

Fixes: 987e00035c ("sched_ext: Rename pnt_seq to kick_sync")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202606122315.pbnDHP0n-lkp@intel.com/
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2026-06-24 12:40:51 -10:00
parent 5c94a3ab6e
commit 115d1ce989
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/ext/ext.c
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@ -5687,7 +5687,7 @@ static void free_kick_syncs(void)
int cpu;
for_each_possible_cpu(cpu) {
struct scx_kick_syncs **ksyncs = per_cpu_ptr(&scx_kick_syncs, cpu);
struct scx_kick_syncs __rcu **ksyncs = per_cpu_ptr(&scx_kick_syncs, cpu);
struct scx_kick_syncs *to_free;
to_free = rcu_replace_pointer(*ksyncs, NULL, true);
@ -6668,7 +6668,7 @@ static int alloc_kick_syncs(void)
* can exceed percpu allocator limits on large machines.
*/
for_each_possible_cpu(cpu) {
struct scx_kick_syncs **ksyncs = per_cpu_ptr(&scx_kick_syncs, cpu);
struct scx_kick_syncs __rcu **ksyncs = per_cpu_ptr(&scx_kick_syncs, cpu);
struct scx_kick_syncs *new_ksyncs;
WARN_ON_ONCE(rcu_access_pointer(*ksyncs));