uml: clean up TASK_SIZE usage
Clean up the calculation and use of the usable address space size on the host.
task_size is gone, replaced with TASK_SIZE, which is calculated from
CONFIG_TOP_ADDR. get_kmem_end and set_task_sizes_skas are also gone.
host_task_size, which refers to the entire address space usable by the UML
kernel and which may be larger than the address space usable by a UML process,
since that has to end on a pgdir boundary, is replaced by CONFIG_TOP_ADDR.
STACK_TOP is now TASK_SIZE minus the two stub pages.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-um/a.out.h b/include/asm-um/a.out.h
index 9281dd8..f42ff145 100644
--- a/include/asm-um/a.out.h
+++ b/include/asm-um/a.out.h
@@ -13,11 +13,9 @@
extern unsigned long stacksizelim;
-extern unsigned long host_task_size;
-
#define STACK_ROOM (stacksizelim)
-#define STACK_TOP task_size
+#define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
#define STACK_TOP_MAX STACK_TOP
diff --git a/include/asm-um/fixmap.h b/include/asm-um/fixmap.h
index 3d3e85d..89a87c1 100644
--- a/include/asm-um/fixmap.h
+++ b/include/asm-um/fixmap.h
@@ -56,9 +56,8 @@
* the start of the fixmap, and leave one page empty
* at the top of mem..
*/
-extern unsigned long get_kmem_end(void);
-#define FIXADDR_TOP (get_kmem_end() - 0x2000)
+#define FIXADDR_TOP (CONFIG_TOP_ADDR - 2 * PAGE_SIZE)
#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
diff --git a/include/asm-um/processor-generic.h b/include/asm-um/processor-generic.h
index 35ab6a2..ecf6706 100644
--- a/include/asm-um/processor-generic.h
+++ b/include/asm-um/processor-generic.h
@@ -94,9 +94,7 @@
/*
* User space process size: 3GB (default).
*/
-extern unsigned long task_size;
-
-#define TASK_SIZE (task_size)
+#define TASK_SIZE (CONFIG_TOP_ADDR & PGDIR_MASK)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.