1 files changed, 11 insertions, 1 deletions

diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c
index 35c37b7f717a..a2dc7f9ecc51 100644
--- a/arch/sh/mm/cache.c
+++ b/arch/sh/mm/cache.c
@@ -128,7 +128,7 @@ void __update_cache(struct vm_area_struct *vma,
                 return;
 
         page = pfn_to_page(pfn);
-        if (pfn_valid(pfn) && page_mapping(page)) {
+        if (pfn_valid(pfn)) {
                 int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
                 if (dirty) {
                         unsigned long addr = (unsigned long)page_address(page);
@@ -265,6 +265,8 @@ static void __init emit_cache_params(void)
 
 void __init cpu_cache_init(void)
 {
+        unsigned int cache_disabled = !(__raw_readl(CCR) & CCR_CACHE_ENABLE);
+
         compute_alias(&boot_cpu_data.icache);
         compute_alias(&boot_cpu_data.dcache);
         compute_alias(&boot_cpu_data.scache);
@@ -273,6 +275,13 @@ void __init cpu_cache_init(void)
         __flush_purge_region            = noop__flush_region;
         __flush_invalidate_region       = noop__flush_region;
 
+        /*
+         * No flushing is necessary in the disabled cache case so we can
+         * just keep the noop functions in local_flush_..() and __flush_..()
+         */
+        if (unlikely(cache_disabled))
+                goto skip;
+
         if (boot_cpu_data.family == CPU_FAMILY_SH2) {
                 extern void __weak sh2_cache_init(void);
 
@@ -312,5 +321,6 @@ void __init cpu_cache_init(void)
                 sh5_cache_init();
         }
 
+skip:
         emit_cache_params();
 }