From: Richard M. Stallman <rms@gnu.org>
Date: Thu, 18 Nov 1993 09:26:05 +0000 (+0000)
Subject: (r_alloc_init): Explicitly use real_morecore
X-Git-Tag: emacs-19.34~10788
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=0e93a7cf3fe10e76ef313e6d7ff4936c2d86ac12;p=emacs.git

(r_alloc_init): Explicitly use real_morecore
to allocate the entire incomplete page.
---

diff --git a/src/ralloc.c b/src/ralloc.c
index 0a06d840843..50b1af8b155 100644
--- a/src/ralloc.c
+++ b/src/ralloc.c
@@ -506,8 +506,20 @@ r_alloc_init ()
   extra_bytes = ROUNDUP (50000);
 
   page_break_value = (POINTER) ROUNDUP (break_value);
+
+  /* The extra call to real_morecore guarantees that the end of the
+     address space is a multiple of page_size, even if page_size is
+     not really the page size of the system running the binary in
+     which page_size is stored.  This allows a binary to be built on a
+     system with one page size and run on a system with a smaller page
+     size. */
+  (*real_morecore) (page_break_value - break_value);
+
   /* Clear the rest of the last page; this memory is in our address space
      even though it is after the sbrk value.  */
+  /* Doubly true, with the additional call that explicitly adds the
+     rest of that page to the address space.  */
   bzero (break_value, (page_break_value - break_value));
+  virtual_break_value = break_value = page_break_value;
   use_relocatable_buffers = 1;
 }