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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2007-04-27 16:01:57 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-04-27 16:01:46 +0200
commit6c210482ae4a9a5bb9377ad250feaacec3faa3cd (patch)
tree2eb89d89a22380298d64edad59010c1d0a59e5a4 /include/asm-generic/pgtable.h
parent2fc2d1e9ffcde78af7ab63ed640d9a4901797de2 (diff)
[S390] split page_test_and_clear_dirty.
The page_test_and_clear_dirty primitive really consists of two operations, page_test_dirty and the page_clear_dirty. The combination of the two is not an atomic operation, so it makes more sense to have two separate operations instead of one. In addition to the improved readability of the s390 version of SetPageUptodate, it now avoids the page_test_dirty operation which is an insert-storage-key-extended (iske) instruction which is an expensive operation. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'include/asm-generic/pgtable.h')
-rw-r--r--include/asm-generic/pgtable.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 6d7e279b149..dc8f99ee305 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -139,8 +139,15 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
#define pte_same(A,B) (pte_val(A) == pte_val(B))
#endif
-#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
-#define page_test_and_clear_dirty(page) (0)
+#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
+#define page_test_dirty(page) (0)
+#endif
+
+#ifndef __HAVE_ARCH_PAGE_CLEAR_DIRTY
+#define page_clear_dirty(page) do { } while (0)
+#endif
+
+#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
#define pte_maybe_dirty(pte) pte_dirty(pte)
#else
#define pte_maybe_dirty(pte) (1)