x86-64 compile error in 2.6.9-rc1-bk1

[Thomas Duffy <Thomas.Duffy.99@alumni.brown.edu>]

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If you have CONFIG_SWIOTLB=y (GART_IOMMU=y), you get:

ld: BFD 2.15.90.0.3 20040415 assertion fail ../../bfd/linker.c:619
arch/x86_64/mm/built-in.o(.init.text+0x52a): In function `mem_init':
: undefined reference to `swiotlb_force'
make[1]: *** [.tmp_vmlinux1] Error 1
make: *** [_all] Error 2

This was added in Linus's tree.  But I cannot find where swiotlb_force is defined...

diff -Nru a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
--- a/arch/x86_64/mm/init.c     2004-06-24 01:55:57 -07:00
+++ b/arch/x86_64/mm/init.c     2004-08-24 02:08:31 -07:00

@@ -396,6 +400,8 @@
        return 0;
 }
                                                                                
+extern int swiotlb_force;
+
 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules,                         kcore_vsyscall;
                                                                                
@@ -405,7 +411,10 @@
        int tmp;
                                                                                
 #ifdef CONFIG_SWIOTLB
-       if (!iommu_aperture && end_pfn >= 0xffffffff>>PAGE_SHIFT)
+       if (swiotlb_force)
+               swiotlb = 1;
+       if (!iommu_aperture &&
+           (end_pfn >= 0xffffffff>>PAGE_SHIFT || force_iommu))
               swiotlb = 1;
        if (swiotlb)
                swiotlb_init();


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