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src/os_cpu/linux_x86/vm/os_linux_x86.cpp

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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

@@ -675,19 +675,19 @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // 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;
+// 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::_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
+#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
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