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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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--- 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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