[uml-devel] Another bug report for UML in latest Linux 2.6-BK repository.

[uml-devel] Another bug report for UML in latest Linux 2.6-BK repository.

[Anton Altaparmakov]

If I enable HIGHMEM in my .config (see my previous bug report for my
.config and just change HIGHMEM to enabled) compilation fails:

[snip]
  CC      arch/um/kernel/mem.o
arch/um/kernel/mem.c: In function `mem_init':
arch/um/kernel/mem.c:71: warning: implicit declaration of function
`phys_page'
arch/um/kernel/mem.c:71: warning: assignment makes pointer from integer
without a cast
arch/um/kernel/mem.c: In function `kmap_init':
arch/um/kernel/mem.c:151: warning: implicit declaration of function
`pte_offset'arch/um/kernel/mem.c:151: warning: assignment makes pointer
from integer without a cast
[snip]
  LD      .tmp_vmlinux1
arch/um/kernel/built-in.o(.text+0x2ca9): In function `mem_init':
arch/um/kernel/mem.c:71: undefined reference to `phys_page'
arch/um/kernel/built-in.o(.init.text+0x1d2): In function `kmap_init':
include/asm/pgtable.h:394: undefined reference to `pte_offset'
collect2: ld returned 1 exit status
  KSYM    .tmp_kallsyms1.S
nm: '.tmp_vmlinux1': No such file
make: *** [.tmp_kallsyms1.S] Error 139

Best regards,

	Anton
-- 
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net
WWW: http://linux-ntfs.sf.net/, http://www-stu.christs.cam.ac.uk/~aia21/



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[uml-devel] Re: Another bug report for UML in latest Linux 2.6-BK repository.

[Jeff Dike]

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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