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uml: clean up TASK_SIZE usage

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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>
This commit is contained in:
Jeff Dike
2008-02-04 22:31:00 -08:00
committed by Linus Torvalds
parent b7c000cbc4
commit 42a2b54ce8
11 changed files with 23 additions and 49 deletions
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22
arch/um/kernel/um_arch.c
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@@ -101,8 +101,6 @@ const struct seq_operations cpuinfo_op = {
};
/* 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 @@ EXPORT_SYMBOL(end_iomem);
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 @@ int __init linux_main(int argc, char **argv)
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 @@ int __init linux_main(int argc, char **argv)
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 @@ int __init linux_main(int argc, char **argv)
}
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;