src/os_cpu/linux_zero/vm/os_linux_zero.cpp

*** 348,369 ****
    size_t guard_bytes;
    res = pthread_attr_getguardsize(&attr, &guard_bytes);
    if (res != 0) {
      fatal("pthread_attr_getguardsize failed with errno = %d", res);
    }
!   int guard_pages = align_size_up(guard_bytes, page_bytes) / page_bytes;
    assert(guard_bytes == guard_pages * page_bytes, "unaligned guard");
  
  #ifdef IA64
    // IA64 has two stacks sharing the same area of memory, a normal
    // stack growing downwards and a register stack growing upwards.
    // Guard pages, if present, are in the centre.  This code splits
    // the stack in two even without guard pages, though in theory
    // there's nothing to stop us allocating more to the normal stack
    // or more to the register stack if one or the other were found
    // to grow faster.
!   int total_pages = align_size_down(stack_bytes, page_bytes) / page_bytes;
    stack_bottom += (total_pages - guard_pages) / 2 * page_bytes;
  #endif // IA64
  
    stack_bottom += guard_bytes;
  
--- 348,369 ----
    size_t guard_bytes;
    res = pthread_attr_getguardsize(&attr, &guard_bytes);
    if (res != 0) {
      fatal("pthread_attr_getguardsize failed with errno = %d", res);
    }
!   int guard_pages = align_up(guard_bytes, page_bytes) / page_bytes;
    assert(guard_bytes == guard_pages * page_bytes, "unaligned guard");
  
  #ifdef IA64
    // IA64 has two stacks sharing the same area of memory, a normal
    // stack growing downwards and a register stack growing upwards.
    // Guard pages, if present, are in the centre.  This code splits
    // the stack in two even without guard pages, though in theory
    // there's nothing to stop us allocating more to the normal stack
    // or more to the register stack if one or the other were found
    // to grow faster.
!   int total_pages = align_down(stack_bytes, page_bytes) / page_bytes;
    stack_bottom += (total_pages - guard_pages) / 2 * page_bytes;
  #endif // IA64
  
    stack_bottom += guard_bytes;