ENJOU1224 opened a new pull request, #17762:
URL: https://github.com/apache/nuttx/pull/17762
## Summary
The `riscv_savevpu`, `riscv_restorevpu`, and `riscv_vpuregs` functions were
using `uintptr_t *` for vector registers, but `tcb->xcp.vregs` is defined as
`uintreg_t *`. This mismatch caused compilation errors on newer GCC versions
(e.g., GCC 13+) due to incompatible pointer types. This patch aligns the
parameter types to `uintreg_t *` to match the structure definition.
## Impact
**Build:** Fixes compilation warnings/errors on GCC 13+ toolchains regarding
incompatible pointer types.
**Hardware:** RISC-V architectures with Vector extension enabled.
**Compatibility:** No functional change in runtime behavior (since
`uintptr_t` and `uintreg_t` usually have the same width on RV32/RV64), but
ensures source-level type safety.
## Testing
**Host Environment:**
* **OS:** Ubuntu 25.10 (Linux 6.17.0-8-generic)
* **Compiler:** riscv64-unknown-elf-gcc (14.2.0+19) 14.2.0
* **QEMU:** QEMU emulator version 10.1.50 (v10.1.0-1314-gf3f2ad1193)
**Verification Steps:**
1. **Compilation Fix verification:**
* **Target:** `rv-virt:nsh` (Modified to enable Vector extension)
* **Command:** `make -j`
* **Before check:** Build fails with `error: passing argument 1 of
'riscv_savevpu' from incompatible pointer type` on GCC 14.2.0.
* **After check:** Build completes successfully without "incompatible
pointer type" errors.
2. **Runtime Verification:**
Booted the image on QEMU to ensure no regression in context switching
initialization.
Command:
```bash
qemu-system-riscv32 \
-nographic \
-M virt \
-bios none \
-kernel ./nuttx \
-cpu max,vlen=256,elen=64,v=true
```
**Boot Log:**
```text
ABC
NuttShell (NSH) NuttX-12.12.0
nsh>
```
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