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authorJeff Dike <jdike@addtoit.com>2008-02-04 22:31:00 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:29 -0800
commit42a2b54ce8c7b9d4f418995a7950e7e2e15e52ce (patch)
tree30bcb0ea0a4ee6d5091b1b9a85589cff8b1863fc /arch/um/include/as-layout.h
parentb7c000cbc4f1fa7b82efa95b34f00c2adbeaa3fe (diff)
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>
Diffstat (limited to 'arch/um/include/as-layout.h')
-rw-r--r--arch/um/include/as-layout.h15
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/um/include/as-layout.h b/arch/um/include/as-layout.h
index 2b859e020ac..a2008f550fe 100644
--- a/arch/um/include/as-layout.h
+++ b/arch/um/include/as-layout.h
@@ -29,9 +29,20 @@
#define _AC(X, Y) __AC(X, Y)
#endif
+/*
+ * The "- 1"'s are to avoid gcc complaining about integer overflows
+ * and unrepresentable decimal constants. With 3-level page tables,
+ * TASK_SIZE is 0x80000000, which gets turned into its signed decimal
+ * equivalent in asm-offsets.s. gcc then complains about that being
+ * unsigned only in C90. To avoid that, UM_TASK_SIZE is defined as
+ * TASK_SIZE - 1. To compensate, we need to add the 1 back here.
+ * However, adding it back to UM_TASK_SIZE produces more gcc
+ * complaints. So, I adjust the thing being subtracted from
+ * UM_TASK_SIZE instead. Bah.
+ */
#define STUB_CODE _AC((unsigned long), \
- UML_CONFIG_TOP_ADDR - 2 * UM_KERN_PAGE_SIZE)
-#define STUB_DATA _AC((unsigned long), UML_CONFIG_TOP_ADDR - UM_KERN_PAGE_SIZE)
+ UM_TASK_SIZE - (2 * UM_KERN_PAGE_SIZE - 1))
+#define STUB_DATA _AC((unsigned long), UM_TASK_SIZE - (UM_KERN_PAGE_SIZE - 1))
#define STUB_START _AC(, STUB_CODE)
#ifndef __ASSEMBLY__