From ca1d48a86fab82da94cf0ddf586b484dcd04df6e Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 8 May 2026 05:50:08 -1000 Subject: [PATCH] sched_ext: Use offsetofend on both sides of the ops_cid layout assert sizeof() includes trailing struct pad, offsetofend() doesn't. On 32-bit PPC, sched_ext_ops_cid tail-pads 4 bytes past @priv and the assert trips. Use offsetofend() on both sides. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202605081637.DbH4SZ1E-lkp@intel.com/ Fixes: 7e655ed7b953 ("sched_ext: Add bpf_sched_ext_ops_cid struct_ops type") Signed-off-by: Tejun Heo --- kernel/sched/ext.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 7ac7d10a41bef..f86ee15be7cb1 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -10380,9 +10380,11 @@ static int __init scx_init(void) /* * cid-form must end exactly at @priv - validate_ops() skips * cpu_acquire/cpu_release for cid-form because reading those fields - * past the BPF allocation would be UB. + * past the BPF allocation would be UB. offsetofend() on both sides + * instead of sizeof() on sched_ext_ops_cid to sidestep trailing + * struct padding (e.g. 32-bit PPC tail-pads ops_cid past @priv). */ - BUILD_BUG_ON(sizeof(struct sched_ext_ops_cid) != + BUILD_BUG_ON(offsetofend(struct sched_ext_ops_cid, priv) != offsetofend(struct sched_ext_ops, priv)); #undef CID_OFFSET_MATCH -- 2.47.3