[PR] arch/risc-v: Fix incompatible pointer types in vector context switching [nuttx]

["ENJOU1224 (via GitHub)" <gi...@apache.org>]

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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Re: [PR] arch/risc-v: Fix incompatible pointer types in vector context switching [nuttx]

["acassis (via GitHub)" <gi...@apache.org>]

acassis merged PR #17762:
URL: https://github.com/apache/nuttx/pull/17762


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