ARM: 5687/1: fix an oops with highmem

In xdr_partial_copy_from_skb() there is that sequence:

		kaddr = kmap_atomic(*ppage, KM_SKB_SUNRPC_DATA);
		[...]
		flush_dcache_page(*ppage);
		kunmap_atomic(kaddr, KM_SKB_SUNRPC_DATA);

Mixing flush_dcache_page() and kmap_atomic() is a bit odd,
especially since kunmap_atomic() must deal with cache issues
already.  OTOH the non-highmem case must use flush_dcache_page()
as kunmap_atomic() becomes a no op with no cache maintenance.

Problem is that with highmem the implementation of kmap_atomic()
doesn't set page->virtual, and page_address(page) returns 0 in
that case. Here flush_dcache_page() calls __flush_dcache_page()
which calls __cpuc_flush_dcache_page(page_address(page)) resulting
in a kernel oops.

None of the kmap_atomic() implementations uses set_page_address().
Hence we can assume page_address() is always expected to return 0 in
that case. Let's conditionally call __cpuc_flush_dcache_page() only
when the page address is non zero, and perform that test only when
highmem is configured.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/flush.c

@@ -144,7 +144,14 @@ void __flush_dcache_page(struct address_space *mapping, struct page *page)
 	 * page.  This ensures that data in the physical page is mutually
 	 * coherent with the kernels mapping.
 	 */
-	__cpuc_flush_dcache_page(page_address(page));
+#ifdef CONFIG_HIGHMEM
+	/*
+	 * kmap_atomic() doesn't set the page virtual address, and
+	 * kunmap_atomic() takes care of cache flushing already.
+	 */
+	if (page_address(page))
+#endif
+		__cpuc_flush_dcache_page(page_address(page));
 
 	/*
 	 * If this is a page cache page, and we have an aliasing VIPT cache,