aia21@cam.ac.uk said:
If I enable HIGHMEM in my .config (see my previous bug report for my
.config and just change HIGHMEM to enabled) compilation fails:
The patch below fixes it.
Jeff
Index: 2.6.9/arch/um/Kconfig
===================================================================
--- 2.6.9.orig/arch/um/Kconfig 2004-11-16 21:25:38.000000000 -0500
+++ 2.6.9/arch/um/Kconfig 2004-11-16 21:44:53.000000000 -0500
@@ -224,7 +224,15 @@
config HIGHMEM
bool "Highmem support"
- depends on BROKEN
+ default n
+ help
+ This enables UML's highmem support. This allows UML to have
+ more physical memory than it can map into its virtual address
+ space. In tt mode, or with CONFIG_MODE_TT enabled, the limit is a
+ bit less than 512M. With CONFIG_MODE_TT disabled and
+ CONFIG_LOAD_LOW and CONFIG_STATIC_LINK enabled, the limit is
+ around 2.75G.
+ Enabling this option slows down UML, signficantly in skas mode.
config KERNEL_STACK_ORDER
int "Kernel stack size order"
Index: 2.6.9/arch/um/kernel/mem.c
===================================================================
--- 2.6.9.orig/arch/um/kernel/mem.c 2004-11-16 21:54:53.000000000 -0500
+++ 2.6.9/arch/um/kernel/mem.c 2004-11-16 21:55:45.000000000 -0500
@@ -68,7 +68,7 @@
max_low_pfn = (high_physmem - uml_physmem) >> PAGE_SHIFT;
#ifdef CONFIG_HIGHMEM
- highmem_start_page = phys_page(__pa(high_physmem));
+ highmem_start_page = pfn_to_page(phys_to_pfn(__pa(high_physmem)));
#endif
/* clear the zero-page */@@ -140,7 +140,7 @@
pgprot_t kmap_prot;
#define kmap_get_fixmap_pte(vaddr) \
- pte_offset_kernel(pmd_offset(pml4_pgd_offset(pml4_offset_k(vaddr),
+ pte_offset_kernel(pmd_offset(pml4_pgd_offset(pml4_offset_k(vaddr), \
vaddr), (vaddr)), (vaddr))
void __init kmap_init(void)
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