X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fglobals.h;h=4ffd653fc9fa4261afcf22482c361c0b9782a458;hb=e404d36bb823d93ad20ccd6c653244cf443f2633;hp=71f30850e79a10356fd637e541cf0a2989956505;hpb=79cc569a97e444389350ea3f5b1017374fe16bec;p=sbcl.git

diff --git a/src/runtime/globals.h b/src/runtime/globals.h
index 71f3085..4ffd653 100644
--- a/src/runtime/globals.h
+++ b/src/runtime/globals.h
@@ -34,9 +34,18 @@ extern lispobj *current_control_frame_pointer;
 extern lispobj *current_binding_stack_pointer;
 # endif
 
-# ifndef LISP_FEATURE_GENCGC
-/* Beware! gencgc has also a (non-global) dynamic_space_free_pointer. */
+#if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64)
+/* This is unused on X86 and X86_64, but is used as the global
+ *  allocation pointer by the cheney GC, and, in some instances, as
+ *  the global allocation pointer on PPC/GENCGC. This should probably
+ *  be cleaned up such that it only needs to exist on cheney. At the
+ *  moment, it is also used by the GENCGC, to hold the pseudo_atomic
+ *  bits, and is tightly coupled to reg_ALLOC by the assembly
+ *  routines. */
 extern lispobj *dynamic_space_free_pointer;
+#endif
+
+# ifndef LISP_FEATURE_GENCGC
 extern lispobj *current_auto_gc_trigger;
 # endif