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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-s390/pgtable.h
parent2fc2d1e9ffcde78af7ab63ed640d9a4901797de2 (diff)
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op-kernel-dev-6c210482ae4a9a5bb9377ad250feaacec3faa3cd.tar.gz
[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-s390/pgtable.h')
-rw-r--r--include/asm-s390/pgtable.h15
1 files changed, 8 insertions, 7 deletions
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 13c1654..8fe8d42 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -753,14 +753,14 @@ ptep_establish(struct vm_area_struct *vma,
* should therefore only be called if it is not mapped in any
* address space.
*/
-static inline int page_test_and_clear_dirty(struct page *page)
+static inline int page_test_dirty(struct page *page)
{
- unsigned long physpage = page_to_phys(page);
- int skey = page_get_storage_key(physpage);
+ return (page_get_storage_key(page_to_phys(page)) & _PAGE_CHANGED) != 0;
+}
- if (skey & _PAGE_CHANGED)
- page_set_storage_key(physpage, skey & ~_PAGE_CHANGED);
- return skey & _PAGE_CHANGED;
+static inline void page_clear_dirty(struct page *page)
+{
+ page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY);
}
/*
@@ -953,7 +953,8 @@ extern void memmap_init(unsigned long, int, unsigned long, unsigned long);
#define __HAVE_ARCH_PTEP_CLEAR_FLUSH
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
#define __HAVE_ARCH_PTE_SAME
-#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
+#define __HAVE_ARCH_PAGE_TEST_DIRTY
+#define __HAVE_ARCH_PAGE_CLEAR_DIRTY
#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
#include <asm-generic/pgtable.h>
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