gpoulios opened a new pull request, #16800:
URL: https://github.com/apache/nuttx/pull/16800
## Summary
Long OP-TEE calls would starve the Normal World tasks. OP-TEE foreign
interrupts were delivered to NW but we would resume OP-TEE immediately without
giving any potentially unblocked tasks a chance to run. This breaks real-time
guarantees.
Fix it by calling `sched_yield()` during OP-TEE return with reason foreign
interrupts (`OPTEE_SMC_RETURN_RPC_FOREIGN_INTR`).
## Impact
Users of `CONFIG_DEV_OPTEE_SMC`:
- Better cooperation with OP-TEE's foreign interrupt delivery mechanism.
Fixes scheduling during long OP-TEE calls with the SMC driver.
Other users:
- No impact.
## Testing
Tested on custom i.MX93 board and i.MX93 EVK with `imx93-evk:koptee` to fix
the issue of starving normal world tasks during CPU-heavy OP-TEE calls.
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