hujun260 opened a new pull request, #17965:
URL: https://github.com/apache/nuttx/pull/17965
## Summary
Disable fork support in ARM64 protected build mode. The ARCH_HAVE_FORK
capability is now only enabled in flat/monolithic build configurations
(!BUILD_KERNEL), and explicitly disabled in protected kernel builds
(!BUILD_PROTECTED). This aligns with architectural limitations where fork is
not safely supported when kernel and userspace memory are separated.
## Changes
- **arch/Kconfig**:
- Update ARM64 ARCH_HAVE_FORK condition from `!BUILD_KERNEL` to
`!BUILD_KERNEL && !BUILD_PROTECTED`
- Ensures fork is available only in flat/monolithic builds
- Prevents fork from being incorrectly enabled in protected mode
configurations
## Benefits & Technical Details
- **Build safety**: Prevents fork from being selected in protected build
mode where it cannot be safely implemented
- **Configuration correctness**: Aligns ARM64 configuration with
architectural memory model limitations
- **Consistency**: Matches restrictions already present in other
architectures for protected builds
- **Error prevention**: Catches configuration errors at build time rather
than runtime
## Testing
- Verified ARCH_HAVE_FORK is not available when CONFIG_BUILD_PROTECTED is
enabled
- Confirmed fork support remains available in flat/monolithic builds
- Tested build configurations with various combinations of BUILD_KERNEL and
BUILD_PROTECTED
- Validated no configuration regressions on existing ARM64 builds
## Impact
- **Compatibility**: No impact on existing configurations that properly use
fork
- **Configuration**: Prevents invalid ARM64 protected mode builds with fork
support
- **Architecture**: ARM64 specific build configuration constraint
- **Scope**: Affects ARM64 architecture build mode selection
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