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Could you try the attached patch?
The code tries to map/unmap highmem pages on the fly, and that fails,
because highmem pages are never mapped.
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Manfred
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--- 2.5/arch/i386/mm/pageattr.c 2003-06-29 14:45:19.000000000 +0200
+++ build-2.5/arch/i386/mm/pageattr.c 2003-06-29 14:58:11.000000000 +0200
@@ -197,6 +197,8 @@
#ifdef CONFIG_DEBUG_PAGEALLOC
void kernel_map_pages(struct page *page, int numpages, int enable)
{
+ if (page >= highmem_start_page)
+ return;
/* the return value is ignored - the calls cannot fail,
* large pages are disabled at boot time.
*/
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