sh: Provide the kmap_coherent() interface generically.

This plugs in kmap_coherent() for the non-SH4 cases to permit the
pg-mmu.c bits to be used generically across all CPUs. SH-5 is still in
the TODO state, but will move over to fixmap and the generic interface
gradually.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/mm/cache-sh5.c

@@ -29,6 +29,21 @@ void __init p3_cache_init(void)
 	dtlb_cache_slot	= sh64_get_wired_dtlb_entry();
 }
 
+void __init kmap_coherent_init(void)
+{
+	/* XXX ... */
+}
+
+void *kmap_coherent(struct page *page, unsigned long addr)
+{
+	/* XXX ... */
+	return NULL;
+}
+
+void kunmap_coherent(void)
+{
+}
+
 #ifdef CONFIG_DCACHE_DISABLED
 #define sh64_dcache_purge_all()					do { } while (0)
 #define sh64_dcache_purge_coloured_phy_page(paddr, eaddr)	do { } while (0)