One-line change for malloc to save address space

[Wolfram Gloger <wmglo at dent dot med dot uni-muenchen dot de>]

Hi,

Here is a small change for malloc that should help save address space
when allocating beyond the sbrk() limit.

Regards,
Wolfram.

2001-02-14  Wolfram Gloger  <wg@malloc.de>

	* malloc/malloc.c (new_heap): When allocating large chunk aligned
	to HEAP_MAX_SIZE, prefer one with lower address, to avoid `holes'
	between the heaps.

Index: libc/malloc/malloc.c
===================================================================
RCS file: /cvs/glibc/libc/malloc/malloc.c,v
retrieving revision 1.78
diff -u -r1.78 malloc.c
--- malloc.c	2001/01/21 21:29:17	1.78
+++ malloc.c	2001/02/14 22:55:44
@@ -2026,7 +2026,7 @@
      anyway). */
   p1 = (char *)MMAP(0, HEAP_MAX_SIZE<<1, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE);
   if(p1 != MAP_FAILED) {
-    p2 = (char *)(((unsigned long)p1 + HEAP_MAX_SIZE) & ~(HEAP_MAX_SIZE-1));
+    p2 = (char *)(((unsigned long)p1 + (HEAP_MAX_SIZE-1)) & ~(HEAP_MAX_SIZE-1));
     ul = p2 - p1;
     munmap(p1, ul);
     munmap(p2 + HEAP_MAX_SIZE, HEAP_MAX_SIZE - ul);