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Subject[PATCH] [19/31] mm: export stable page flags
Date

From: Wu Fengguang <fengguang.wu@intel.com>

Rename get_uflags() to stable_page_flags() and make it a global function
for use in the hwpoison page flags filter, which need to compare user
page flags with the value provided by user space.

Also move KPF_* to kernel-page-flags.h for use by user space tools.

CC: Matt Mackall <mpm@selenic.com>
CC: Nick Piggin <npiggin@suse.de>
CC: Christoph Lameter <cl@linux-foundation.org>
CC: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

---
fs/proc/page.c | 45 ++-----------------------------------
include/linux/kernel-page-flags.h | 46 ++++++++++++++++++++++++++++++++++++++
include/linux/page-flags.h | 2 +
3 files changed, 51 insertions(+), 42 deletions(-)
Index: linux/fs/proc/page.c
===================================================================
--- linux.orig/fs/proc/page.c
+++ linux/fs/proc/page.c
@@ -8,6 +8,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/hugetlb.h>
+#include <linux/kernel-page-flags.h>
#include <asm/uaccess.h>
#include "internal.h"

@@ -71,52 +72,12 @@ static const struct file_operations proc
* physical page flags.
*/

-/* These macros are used to decouple internal flags from exported ones */
-
-#define KPF_LOCKED 0
-#define KPF_ERROR 1
-#define KPF_REFERENCED 2
-#define KPF_UPTODATE 3
-#define KPF_DIRTY 4
-#define KPF_LRU 5
-#define KPF_ACTIVE 6
-#define KPF_SLAB 7
-#define KPF_WRITEBACK 8
-#define KPF_RECLAIM 9
-#define KPF_BUDDY 10
-
-/* 11-20: new additions in 2.6.31 */
-#define KPF_MMAP 11
-#define KPF_ANON 12
-#define KPF_SWAPCACHE 13
-#define KPF_SWAPBACKED 14
-#define KPF_COMPOUND_HEAD 15
-#define KPF_COMPOUND_TAIL 16
-#define KPF_HUGE 17
-#define KPF_UNEVICTABLE 18
-#define KPF_HWPOISON 19
-#define KPF_NOPAGE 20
-
-#define KPF_KSM 21
-
-/* kernel hacking assistances
- * WARNING: subject to change, never rely on them!
- */
-#define KPF_RESERVED 32
-#define KPF_MLOCKED 33
-#define KPF_MAPPEDTODISK 34
-#define KPF_PRIVATE 35
-#define KPF_PRIVATE_2 36
-#define KPF_OWNER_PRIVATE 37
-#define KPF_ARCH 38
-#define KPF_UNCACHED 39
-
static inline u64 kpf_copy_bit(u64 kflags, int ubit, int kbit)
{
return ((kflags >> kbit) & 1) << ubit;
}

-static u64 get_uflags(struct page *page)
+u64 stable_page_flags(struct page *page)
{
u64 k;
u64 u;
@@ -219,7 +180,7 @@ static ssize_t kpageflags_read(struct fi
else
ppage = NULL;

- if (put_user(get_uflags(ppage), out)) {
+ if (put_user(stable_page_flags(ppage), out)) {
ret = -EFAULT;
break;
}
Index: linux/include/linux/page-flags.h
===================================================================
--- linux.orig/include/linux/page-flags.h
+++ linux/include/linux/page-flags.h
@@ -284,6 +284,8 @@ PAGEFLAG_FALSE(HWPoison)
#define __PG_HWPOISON 0
#endif

+u64 stable_page_flags(struct page *page);
+
static inline int PageUptodate(struct page *page)
{
int ret = test_bit(PG_uptodate, &(page)->flags);
Index: linux/include/linux/kernel-page-flags.h
===================================================================
--- /dev/null
+++ linux/include/linux/kernel-page-flags.h
@@ -0,0 +1,46 @@
+#ifndef LINUX_KERNEL_PAGE_FLAGS_H
+#define LINUX_KERNEL_PAGE_FLAGS_H
+
+/*
+ * Stable page flag bits exported to user space
+ */
+
+#define KPF_LOCKED 0
+#define KPF_ERROR 1
+#define KPF_REFERENCED 2
+#define KPF_UPTODATE 3
+#define KPF_DIRTY 4
+#define KPF_LRU 5
+#define KPF_ACTIVE 6
+#define KPF_SLAB 7
+#define KPF_WRITEBACK 8
+#define KPF_RECLAIM 9
+#define KPF_BUDDY 10
+
+/* 11-20: new additions in 2.6.31 */
+#define KPF_MMAP 11
+#define KPF_ANON 12
+#define KPF_SWAPCACHE 13
+#define KPF_SWAPBACKED 14
+#define KPF_COMPOUND_HEAD 15
+#define KPF_COMPOUND_TAIL 16
+#define KPF_HUGE 17
+#define KPF_UNEVICTABLE 18
+#define KPF_HWPOISON 19
+#define KPF_NOPAGE 20
+
+#define KPF_KSM 21
+
+/* kernel hacking assistances
+ * WARNING: subject to change, never rely on them!
+ */
+#define KPF_RESERVED 32
+#define KPF_MLOCKED 33
+#define KPF_MAPPEDTODISK 34
+#define KPF_PRIVATE 35
+#define KPF_PRIVATE_2 36
+#define KPF_OWNER_PRIVATE 37
+#define KPF_ARCH 38
+#define KPF_UNCACHED 39
+
+#endif /* LINUX_KERNEL_PAGE_FLAGS_H */

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