src/os_cpu/linux_x86/vm/os_linux_x86.cpp

rev 12363 : 8169373: Work around linux NPTL stack guard error.
Summary: Also skip libc guard page for compiler thread, merge similar code on linux platforms, and streamline libc guard page handling on linuxs390, linuxppc, aixppc.
Reviewed-by: dholmes, dcubed
rev 12364 : imported patch compilerGuardFix.patch

*** 675,693 ****
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  // thread stack
  
! #ifdef AMD64
! size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K;
! size_t os::Posix::_java_thread_min_stack_allowed = 64 * K;
  size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
  #else
- size_t os::Posix::_compiler_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K;
- size_t os::Posix::_java_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K;
  size_t os::Posix::_vm_internal_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K;
! #endif // AMD64
  
  // return default stack size for thr_type
  size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
    // default stack size (compiler thread needs larger stack)
  #ifdef AMD64
--- 675,693 ----
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  // thread stack
  
! // Minimum usable stack sizes required to get to user code. Space for
! // HotSpot guard pages is added later.
! size_t os::Posix::_compiler_thread_min_stack_allowed = 48 * K;
! size_t os::Posix::_java_thread_min_stack_allowed = 40 * K;
! #ifdef _LP64
  size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
  #else
  size_t os::Posix::_vm_internal_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K;
! #endif // _LP64
  
  // return default stack size for thr_type
  size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
    // default stack size (compiler thread needs larger stack)
  #ifdef AMD64