binfmt: refactor loadable module cleanup mechanism

[hujun260]

Summary

This PR refactors the loadable binary module cleanup mechanism to remove the
deprecated group_exitinfo() function and simplify the module unload process.
The changes eliminate unnecessary critical section locking in the exec path and
integrate module unload setup directly into the task initialization sequence.

Changes

The refactoring involves several related changes across the binary format and
group management subsystems:

1. binfmt/binfmt_exec.c - Simplify exec_internal():

   • Remove irqstate_t flags variable and related critical section management
   • Remove enter_critical_section() and sched_lock() calls
   • Remove deprecated group_exitinfo() call and associated error handling
   • Simplify error handling paths by eliminating unnecessary cleanup code
   • Result: Cleaner, more straightforward module execution flow

2. binfmt/binfmt_execmodule.c - Move unload setup to exec_module():

   • Add direct assignment: tcb->group->tg_bininfo = binp under CONFIG_BINFMT_LOADABLE
   • Integrates naturally with task activation
   • Eliminates need for separate group_exitinfo() function call
   • Module information is now directly accessible when task exits

3. include/nuttx/sched.h - Remove deprecated interface:

   • Remove group_exitinfo() function declaration
   • Remove associated documentation and comments

4. sched/group/CMakeLists.txt and Make.defs:

   • Remove group_exitinfo.c source file from build
   • Clean up build configuration

Benefits

• Code Simplification: Eliminates unnecessary critical section overhead
• Performance: Removes redundant locking/unlocking operations
• Maintainability: Consolidates module initialization logic into single place
• Architecture: Direct assignment pattern is clearer than indirect registration
• Robustness: Reduces complexity reduces potential race conditions

Testing

Tested on:

• Platform: NuttX with loadable module support (CONFIG_BINFMT_LOADABLE=y)
• Configuration: ELF and other binary format drivers
• Test scenarios:
  • Load and execute tasks with loadable modules
  • Verify module cleanup occurs at task exit
  • Test error paths during module loading/execution
  • Concurrent task creation with different module types
  • Memory allocation/deallocation for module structures
• Result:
  • All loadable modules work correctly with simplified mechanism
  • No memory leaks during module cleanup
  • Performance improved due to reduced critical section overhead
  • No functional regressions observed

Impact

• Stability: Maintains module loading/unloading functionality
• Performance: Improves performance by eliminating critical section overhead
• Compatibility: No breaking changes to public APIs
• Code Quality: Improves code organization and maintainability
• Architecture: Aligns module setup with natural task initialization flow

[xiaoxiang781216]

where we remove group_exitinfo code

[hujun260]

done