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/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 1139e07..9ba39ab 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -101,8 +101,6 @@
};
/* Set in linux_main */
-unsigned long host_task_size;
-unsigned long task_size;
unsigned long uml_physmem;
unsigned long uml_reserved; /* Also modified in mem_init */
unsigned long start_vm;
@@ -234,20 +232,6 @@
extern char __binary_start;
-static unsigned long set_task_sizes_skas(unsigned long *task_size_out)
-{
- /* Round up to the nearest 4M */
- unsigned long host_task_size = ROUND_4M((unsigned long)
- &host_task_size);
-
- if (!skas_needs_stub)
- *task_size_out = host_task_size;
- else
- *task_size_out = STUB_START & PGDIR_MASK;
-
- return host_task_size;
-}
-
int __init linux_main(int argc, char **argv)
{
unsigned long avail, diff;
@@ -278,8 +262,6 @@
printf("UML running in %s mode\n", mode);
- host_task_size = set_task_sizes_skas(&task_size);
-
brk_start = (unsigned long) sbrk(0);
/*
@@ -304,7 +286,7 @@
highmem = 0;
iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
- max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
+ max_physmem = CONFIG_TOP_ADDR - uml_physmem - iomem_size - MIN_VMALLOC;
/*
* Zones have to begin on a 1 << MAX_ORDER page boundary,
@@ -336,7 +318,7 @@
}
virtmem_size = physmem_size;
- avail = get_kmem_end() - start_vm;
+ avail = CONFIG_TOP_ADDR - start_vm;
if (physmem_size > avail)
virtmem_size = avail;
end_vm = start_vm + virtmem_size;