sh: Revert lazy dcache writeback changes.

These ended up causing too many problems on older parts,
revert for now..

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

1 files changed, 29 insertions, 2 deletions

diff --git a/arch/sh/mm/pg-sh7705.c b/arch/sh/mm/pg-sh7705.c
index 887ab9d18ccd..a4b015f95a3a 100644
--- a/arch/sh/mm/pg-sh7705.c
+++ b/arch/sh/mm/pg-sh7705.c
@@ -7,7 +7,9 @@
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
+ *
  */
+
 #include <linux/init.h>
 #include <linux/mman.h>
 #include <linux/mm.h>
@@ -74,6 +76,7 @@ void clear_user_page(void *to, unsigned long address, struct page *pg)
 {
         struct page *page = virt_to_page(to);
 
+        __set_bit(PG_mapped, &page->flags);
         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
                 clear_page(to);
                 __flush_wback_region(to, PAGE_SIZE);
@@ -92,11 +95,12 @@ void clear_user_page(void *to, unsigned long address, struct page *pg)
  * @from: P1 address
  * @address: U0 address to be mapped
  */
-void copy_user_page(void *to, void *from, unsigned long address,
-                    struct page *pg)
+void copy_user_page(void *to, void *from, unsigned long address, struct page *pg)
 {
         struct page *page = virt_to_page(to);
 
+
+        __set_bit(PG_mapped, &page->flags);
         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
                 copy_page(to, from);
                 __flush_wback_region(to, PAGE_SIZE);
@@ -108,3 +112,26 @@ void copy_user_page(void *to, void *from, unsigned long address,
                 __flush_wback_region(to, PAGE_SIZE);
         }
 }
+
+/*
+ * For SH7705, we have our own implementation for ptep_get_and_clear
+ * Copied from pg-sh4.c
+ */
+inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+        pte_t pte = *ptep;
+
+        pte_clear(mm, addr, ptep);
+        if (!pte_not_present(pte)) {
+                unsigned long pfn = pte_pfn(pte);
+                if (pfn_valid(pfn)) {
+                        struct page *page = pfn_to_page(pfn);
+                        struct address_space *mapping = page_mapping(page);
+                        if (!mapping || !mapping_writably_mapped(mapping))
+                                __clear_bit(PG_mapped, &page->flags);
+                }
+        }
+
+        return pte;
+}
+