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sched_ext: Use offsetofend on both sides of the ops_cid layout assert

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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 <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202605081637.DbH4SZ1E-lkp@intel.com/
Fixes: 7e655ed7b9 ("sched_ext: Add bpf_sched_ext_ops_cid struct_ops type")
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2026-05-08 05:50:08 -10:00
parent e18002d2c7
commit ca1d48a86f
1 changed files with 4 additions and 2 deletions
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6
kernel/sched/ext.c
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@ -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