commit c2fda5fed81eea077363b285b66eafce20dfd45a
author Peter Zijlstra <a.p.zijlstra@chello.nl> Fri Dec 22 14:25:52 2006 +0100
committer Linus Torvalds <torvalds@woody.osdl.org> Fri Dec 22 10:39:35 2006 -0800
tree db4c7cdc8492df706a26eaeb050b8a788168fd32
parent e21654a756177bf209d7a3cbe971f16104555f75

[PATCH] Fix up page_mkclean_one(): virtual caches, s390

 - add flush_cache_page() for all those virtual indexed cache
   architectures.

 - handle s390.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index b3deda8..57306fa 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -433,7 +433,7 @@
 {
 	struct mm_struct *mm = vma->vm_mm;
 	unsigned long address;
-	pte_t *pte, entry;
+	pte_t *pte;
 	spinlock_t *ptl;
 	int ret = 0;
 
@@ -445,17 +445,18 @@
 	if (!pte)
 		goto out;
 
-	if (!pte_dirty(*pte) && !pte_write(*pte))
-		goto unlock;
+	if (pte_dirty(*pte) || pte_write(*pte)) {
+		pte_t entry;
 
-	entry = ptep_get_and_clear(mm, address, pte);
-	entry = pte_mkclean(entry);
-	entry = pte_wrprotect(entry);
-	ptep_establish(vma, address, pte, entry);
-	lazy_mmu_prot_update(entry);
-	ret = 1;
+		flush_cache_page(vma, address, pte_pfn(*pte));
+		entry = ptep_clear_flush(vma, address, pte);
+		entry = pte_wrprotect(entry);
+		entry = pte_mkclean(entry);
+		set_pte_at(vma, address, pte, entry);
+		lazy_mmu_prot_update(entry);
+		ret = 1;
+	}
 
-unlock:
 	pte_unmap_unlock(pte, ptl);
 out:
 	return ret;
@@ -490,6 +491,8 @@
 		if (mapping)
 			ret = page_mkclean_file(mapping, page);
 	}
+	if (page_test_and_clear_dirty(page))
+		ret = 1;
 
 	return ret;
 }