1 files changed, 19 insertions, 1 deletions

diff --git a/arch/mn10300/mm/cache.c b/arch/mn10300/mm/cache.c
index 1b76719ec1c3..9261217e8d2c 100644
--- a/arch/mn10300/mm/cache.c
+++ b/arch/mn10300/mm/cache.c
@@ -54,13 +54,30 @@ EXPORT_SYMBOL(flush_icache_page);
 void flush_icache_range(unsigned long start, unsigned long end)
 {
 #ifdef CONFIG_MN10300_CACHE_WBACK
-        unsigned long addr, size, off;
+        unsigned long addr, size, base, off;
         struct page *page;
         pgd_t *pgd;
         pud_t *pud;
         pmd_t *pmd;
         pte_t *ppte, pte;
 
+        if (end > 0x80000000UL) {
+                /* addresses above 0xa0000000 do not go through the cache */
+                if (end > 0xa0000000UL) {
+                        end = 0xa0000000UL;
+                        if (start >= end)
+                                return;
+                }
+
+                /* kernel addresses between 0x80000000 and 0x9fffffff do not
+                 * require page tables, so we just map such addresses directly */
+                base = (start >= 0x80000000UL) ? start : 0x80000000UL;
+                mn10300_dcache_flush_range(base, end);
+                if (base == start)
+                        goto invalidate;
+                end = base;
+        }
+
         for (; start < end; start += size) {
                 /* work out how much of the page to flush */
                 off = start & (PAGE_SIZE - 1);
@@ -104,6 +121,7 @@ void flush_icache_range(unsigned long start, unsigned long end)
         }
 #endif
 
+invalidate:
         mn10300_icache_inv();
 }
 EXPORT_SYMBOL(flush_icache_range);