1 files changed, 31 insertions, 152 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 0c076d58c676..4830a3bedfb2 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -5,36 +5,33 @@
 #ifndef PAGE_FLAGS_H
 #define PAGE_FLAGS_H
-#include <linux/percpu.h>
-#include <linux/cache.h>
 #include <linux/types.h>
-#include <asm/pgtable.h>
 /*
 * Various page->flags bits:
 *
 * PG_reserved is set for special pages, which can never be swapped out. Some
 * of them might not even exist (eg empty_bad_page)...
 *
- * The PG_private bitflag is set if page->private contains a valid value.
+ * The PG_private bitflag is set on pagecache pages if they contain filesystem
+ * specific data (which is normally at page->private). It can be used by
+ * private allocations for its own usage.
+ *
+ * During initiation of disk I/O, PG_locked is set. This bit is set before I/O
+ * and cleared when writeback _starts_ or when read _completes_. PG_writeback
+ * is set before writeback starts and cleared when it finishes.
 *
- * During disk I/O, PG_locked is used. This bit is set before I/O and
+ * PG_locked also pins a page in pagecache, and blocks truncation of the file
- * reset when I/O completes. page_waitqueue(page) is a wait queue of all tasks
+ * while it is held.
- * waiting for the I/O on this page to complete.
+ *
+ * page_waitqueue(page) is a wait queue of all tasks waiting for the page
+ * to become unlocked.
 *
 * PG_uptodate tells whether the page's contents is valid.  When a read
 * completes, the page becomes uptodate, unless a disk I/O error happened.
 *
- * For choosing which pages to swap out, inode pages carry a PG_referenced bit,
+ * PG_referenced, PG_reclaim are used for page reclaim for anonymous and
- * which is set any time the system accesses that page through the (mapping,
+ * file-backed pagecache (see mm/vmscan.c).
- * index) hash table.  This referenced bit, together with the referenced bit
- * in the page tables, is used to manipulate page->age and move the page across
- * the active, inactive_dirty and inactive_clean lists.
- *
- * Note that the referenced bit, the page->lru list_head and the active,
- * inactive_dirty and inactive_clean lists are protected by the
- * zone->lru_lock, and *NOT* by the usual PG_locked bit!
 *
 * PG_error is set to indicate that an I/O error occurred on this page.
 *
@@ -46,6 +43,10 @@
 * space, they need to be kmapped separately for doing IO on the pages.  The
 * struct page (these bits with information) are always mapped into kernel
 * address space...
+ *
+ * PG_buddy is set to indicate that the page is free and in the buddy system
+ * (see mm/page_alloc.c).
+ *
 */
 /*
@@ -78,7 +79,7 @@
 #define PG_checked               8      /* kill me in 2.5.<early>. */
 #define PG_arch_1                9
 #define PG_reserved             10
-#define PG_private              11      /* Has something at ->private */
+#define PG_private              11      /* If pagecache, has fs-private data */
 #define PG_writeback            12      /* Page is under writeback */
 #define PG_nosave               13      /* Used for system suspend/resume */
@@ -87,7 +88,7 @@
 #define PG_mappedtodisk         16      /* Has blocks allocated on-disk */
 #define PG_reclaim              17      /* To be reclaimed asap */
-#define PG_nosave_free          18      /* Free, should not be written */
+#define PG_nosave_free          18      /* Used for system suspend/resume */
 #define PG_buddy                19      /* Page is free, on buddy lists */
@@ -103,134 +104,6 @@
 #endif
 /*
- * Global page accounting.  One instance per CPU.  Only unsigned longs are
- * allowed.
- *
- * - Fields can be modified with xxx_page_state and xxx_page_state_zone at
- * any time safely (which protects the instance from modification by
- * interrupt.
- * - The __xxx_page_state variants can be used safely when interrupts are
- * disabled.
- * - The __xxx_page_state variants can be used if the field is only
- * modified from process context and protected from preemption, or only
- * modified from interrupt context.  In this case, the field should be
- * commented here.
- */
-struct page_state {
-        unsigned long nr_dirty;         /* Dirty writeable pages */
-        unsigned long nr_writeback;     /* Pages under writeback */
-        unsigned long nr_unstable;      /* NFS unstable pages */
-        unsigned long nr_page_table_pages;/* Pages used for pagetables */
-        unsigned long nr_mapped;        /* mapped into pagetables.
-                                         * only modified from process context */
-        unsigned long nr_slab;          /* In slab */
-#define GET_PAGE_STATE_LAST nr_slab
-        /*
-         * The below are zeroed by get_page_state().  Use get_full_page_state()
-         * to add up all these.
-         */
-        unsigned long pgpgin;           /* Disk reads */
-        unsigned long pgpgout;          /* Disk writes */
-        unsigned long pswpin;           /* swap reads */
-        unsigned long pswpout;          /* swap writes */
-        unsigned long pgalloc_high;     /* page allocations */
-        unsigned long pgalloc_normal;
-        unsigned long pgalloc_dma32;
-        unsigned long pgalloc_dma;
-        unsigned long pgfree;           /* page freeings */
-        unsigned long pgactivate;       /* pages moved inactive->active */
-        unsigned long pgdeactivate;     /* pages moved active->inactive */
-        unsigned long pgfault;          /* faults (major+minor) */
-        unsigned long pgmajfault;       /* faults (major only) */
-        unsigned long pgrefill_high;    /* inspected in refill_inactive_zone */
-        unsigned long pgrefill_normal;
-        unsigned long pgrefill_dma32;
-        unsigned long pgrefill_dma;
-        unsigned long pgsteal_high;     /* total highmem pages reclaimed */
-        unsigned long pgsteal_normal;
-        unsigned long pgsteal_dma32;
-        unsigned long pgsteal_dma;
-        unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
-        unsigned long pgscan_kswapd_normal;
-        unsigned long pgscan_kswapd_dma32;
-        unsigned long pgscan_kswapd_dma;
-        unsigned long pgscan_direct_high;/* total highmem pages scanned */
-        unsigned long pgscan_direct_normal;
-        unsigned long pgscan_direct_dma32;
-        unsigned long pgscan_direct_dma;
-        unsigned long pginodesteal;     /* pages reclaimed via inode freeing */
-        unsigned long slabs_scanned;    /* slab objects scanned */
-        unsigned long kswapd_steal;     /* pages reclaimed by kswapd */
-        unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
-        unsigned long pageoutrun;       /* kswapd's calls to page reclaim */
-        unsigned long allocstall;       /* direct reclaim calls */
-        unsigned long pgrotated;        /* pages rotated to tail of the LRU */
-        unsigned long nr_bounce;        /* pages for bounce buffers */
-};
-extern void get_page_state(struct page_state *ret);
-extern void get_page_state_node(struct page_state *ret, int node);
-extern void get_full_page_state(struct page_state *ret);
-extern unsigned long read_page_state_offset(unsigned long offset);
-extern void mod_page_state_offset(unsigned long offset, unsigned long delta);
-extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
-#define read_page_state(member) \
-        read_page_state_offset(offsetof(struct page_state, member))
-#define mod_page_state(member, delta)   \
-        mod_page_state_offset(offsetof(struct page_state, member), (delta))
-#define __mod_page_state(member, delta) \
-        __mod_page_state_offset(offsetof(struct page_state, member), (delta))
-#define inc_page_state(member)          mod_page_state(member, 1UL)
-#define dec_page_state(member)          mod_page_state(member, 0UL - 1)
-#define add_page_state(member,delta)    mod_page_state(member, (delta))
-#define sub_page_state(member,delta)    mod_page_state(member, 0UL - (delta))
-#define __inc_page_state(member)        __mod_page_state(member, 1UL)
-#define __dec_page_state(member)        __mod_page_state(member, 0UL - 1)
-#define __add_page_state(member,delta)  __mod_page_state(member, (delta))
-#define __sub_page_state(member,delta)  __mod_page_state(member, 0UL - (delta))
-#define page_state(member) (*__page_state(offsetof(struct page_state, member)))
-#define state_zone_offset(zone, member)                                 \
-({                                                                      \
-        unsigned offset;                                                \
-        if (is_highmem(zone))                                           \
-                offset = offsetof(struct page_state, member##_high);    \
-        else if (is_normal(zone))                                       \
-                offset = offsetof(struct page_state, member##_normal);  \
-        else if (is_dma32(zone))                                        \
-                offset = offsetof(struct page_state, member##_dma32);   \
-        else                                                            \
-                offset = offsetof(struct page_state, member##_dma);     \
-        offset;                                                         \
-})
-#define __mod_page_state_zone(zone, member, delta)                      \
- do {                                                                   \
-        __mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
- } while (0)
-#define mod_page_state_zone(zone, member, delta)                        \
- do {                                                                   \
-        mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
- } while (0)
-/*
 * Manipulation of page state flags
 */
 #define PageLocked(page)                \
@@ -254,7 +127,13 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
 #define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags)
 #define PageUptodate(page)      test_bit(PG_uptodate, &(page)->flags)
-#ifndef SetPageUptodate
+#ifdef CONFIG_S390
+static inline void SetPageUptodate(struct page *page)
+{
+        if (!test_and_set_bit(PG_uptodate, &page->flags))
+                page_test_and_clear_dirty(page);
+}
+#else
 #define SetPageUptodate(page)   set_bit(PG_uptodate, &(page)->flags)
 #endif
 #define ClearPageUptodate(page) clear_bit(PG_uptodate, &(page)->flags)
@@ -306,7 +185,7 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
        do {                                                            \
                if (!test_and_set_bit(PG_writeback,                     \
                                &(page)->flags))                        \
-                        inc_page_state(nr_writeback);                   \
+                        inc_zone_page_state(page, NR_WRITEBACK);        \
        } while (0)
 #define TestSetPageWriteback(page)                                      \
        ({                                                              \
@@ -314,14 +193,14 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
                ret = test_and_set_bit(PG_writeback,                    \
                                        &(page)->flags);                \
                if (!ret)                                               \
-                        inc_page_state(nr_writeback);                   \
+                        inc_zone_page_state(page, NR_WRITEBACK);        \
                ret;                                                    \
        })
 #define ClearPageWriteback(page)                                        \
        do {                                                            \
                if (test_and_clear_bit(PG_writeback,                    \
                                &(page)->flags))                        \
-                        dec_page_state(nr_writeback);                   \
+                        dec_zone_page_state(page, NR_WRITEBACK);        \
        } while (0)
 #define TestClearPageWriteback(page)                                    \
        ({                                                              \
@@ -329,7 +208,7 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
                ret = test_and_clear_bit(PG_writeback,                  \
                                &(page)->flags);                        \
                if (ret)                                                \
-                        dec_page_state(nr_writeback);                   \
+                        dec_zone_page_state(page, NR_WRITEBACK);        \
                ret;                                                    \
        })

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 0c076d58c676..4830a3bedfb2 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h
@@ -5,36 +5,33 @@
5	#ifndef PAGE_FLAGS_H	5	#ifndef PAGE_FLAGS_H
6	#define PAGE_FLAGS_H	6	#define PAGE_FLAGS_H
7		7
8	#include <linux/percpu.h>
9	#include <linux/cache.h>
10	#include <linux/types.h>	8	#include <linux/types.h>
11		9
12	#include <asm/pgtable.h>
13
14	/*	10	/*
15	* Various page->flags bits:	11	* Various page->flags bits:
16	*	12	*
17	* PG_reserved is set for special pages, which can never be swapped out. Some	13	* PG_reserved is set for special pages, which can never be swapped out. Some
18	* of them might not even exist (eg empty_bad_page)...	14	* of them might not even exist (eg empty_bad_page)...
19	*	15	*
20	* The PG_private bitflag is set if page->private contains a valid value.	16	* The PG_private bitflag is set on pagecache pages if they contain filesystem
		17	* specific data (which is normally at page->private). It can be used by
		18	* private allocations for its own usage.
		19	*
		20	* During initiation of disk I/O, PG_locked is set. This bit is set before I/O
		21	* and cleared when writeback _starts_ or when read _completes_. PG_writeback
		22	* is set before writeback starts and cleared when it finishes.
21	*	23	*
22	* During disk I/O, PG_locked is used. This bit is set before I/O and	24	* PG_locked also pins a page in pagecache, and blocks truncation of the file
23	* reset when I/O completes. page_waitqueue(page) is a wait queue of all tasks	25	* while it is held.
24	* waiting for the I/O on this page to complete.	26	*
		27	* page_waitqueue(page) is a wait queue of all tasks waiting for the page
		28	* to become unlocked.
25	*	29	*
26	* PG_uptodate tells whether the page's contents is valid. When a read	30	* PG_uptodate tells whether the page's contents is valid. When a read
27	* completes, the page becomes uptodate, unless a disk I/O error happened.	31	* completes, the page becomes uptodate, unless a disk I/O error happened.
28	*	32	*
29	* For choosing which pages to swap out, inode pages carry a PG_referenced bit,	33	* PG_referenced, PG_reclaim are used for page reclaim for anonymous and
30	* which is set any time the system accesses that page through the (mapping,	34	* file-backed pagecache (see mm/vmscan.c).
31	* index) hash table. This referenced bit, together with the referenced bit
32	* in the page tables, is used to manipulate page->age and move the page across
33	* the active, inactive_dirty and inactive_clean lists.
34	*
35	* Note that the referenced bit, the page->lru list_head and the active,
36	* inactive_dirty and inactive_clean lists are protected by the
37	* zone->lru_lock, and NOT by the usual PG_locked bit!
38	*	35	*
39	* PG_error is set to indicate that an I/O error occurred on this page.	36	* PG_error is set to indicate that an I/O error occurred on this page.
40	*	37	*
@@ -46,6 +43,10 @@
46	* space, they need to be kmapped separately for doing IO on the pages. The	43	* space, they need to be kmapped separately for doing IO on the pages. The
47	* struct page (these bits with information) are always mapped into kernel	44	* struct page (these bits with information) are always mapped into kernel
48	* address space...	45	* address space...
		46	*
		47	* PG_buddy is set to indicate that the page is free and in the buddy system
		48	* (see mm/page_alloc.c).
		49	*
49	*/	50	*/
50		51
51	/*	52	/*
@@ -78,7 +79,7 @@
78	#define PG_checked 8 /* kill me in 2.5.<early>. */	79	#define PG_checked 8 /* kill me in 2.5.<early>. */
79	#define PG_arch_1 9	80	#define PG_arch_1 9
80	#define PG_reserved 10	81	#define PG_reserved 10
81	#define PG_private 11 /* Has something at ->private */	82	#define PG_private 11 /* If pagecache, has fs-private data */
82		83
83	#define PG_writeback 12 /* Page is under writeback */	84	#define PG_writeback 12 /* Page is under writeback */
84	#define PG_nosave 13 /* Used for system suspend/resume */	85	#define PG_nosave 13 /* Used for system suspend/resume */
@@ -87,7 +88,7 @@
87		88
88	#define PG_mappedtodisk 16 /* Has blocks allocated on-disk */	89	#define PG_mappedtodisk 16 /* Has blocks allocated on-disk */
89	#define PG_reclaim 17 /* To be reclaimed asap */	90	#define PG_reclaim 17 /* To be reclaimed asap */
90	#define PG_nosave_free 18 /* Free, should not be written */	91	#define PG_nosave_free 18 /* Used for system suspend/resume */
91	#define PG_buddy 19 /* Page is free, on buddy lists */	92	#define PG_buddy 19 /* Page is free, on buddy lists */
92		93
93		94
@@ -103,134 +104,6 @@
103	#endif	104	#endif
104		105
105	/*	106	/*
106	* Global page accounting. One instance per CPU. Only unsigned longs are
107	* allowed.
108	*
109	* - Fields can be modified with xxx_page_state and xxx_page_state_zone at
110	* any time safely (which protects the instance from modification by
111	* interrupt.
112	* - The __xxx_page_state variants can be used safely when interrupts are
113	* disabled.
114	* - The __xxx_page_state variants can be used if the field is only
115	* modified from process context and protected from preemption, or only
116	* modified from interrupt context. In this case, the field should be
117	* commented here.
118	*/
119	struct page_state {
120	unsigned long nr_dirty; /* Dirty writeable pages */
121	unsigned long nr_writeback; /* Pages under writeback */
122	unsigned long nr_unstable; /* NFS unstable pages */
123	unsigned long nr_page_table_pages;/* Pages used for pagetables */
124	unsigned long nr_mapped; /* mapped into pagetables.
125	* only modified from process context */
126	unsigned long nr_slab; /* In slab */
127	#define GET_PAGE_STATE_LAST nr_slab
128
129	/*
130	* The below are zeroed by get_page_state(). Use get_full_page_state()
131	* to add up all these.
132	*/
133	unsigned long pgpgin; /* Disk reads */
134	unsigned long pgpgout; /* Disk writes */
135	unsigned long pswpin; /* swap reads */
136	unsigned long pswpout; /* swap writes */
137
138	unsigned long pgalloc_high; /* page allocations */
139	unsigned long pgalloc_normal;
140	unsigned long pgalloc_dma32;
141	unsigned long pgalloc_dma;
142
143	unsigned long pgfree; /* page freeings */
144	unsigned long pgactivate; /* pages moved inactive->active */
145	unsigned long pgdeactivate; /* pages moved active->inactive */
146
147	unsigned long pgfault; /* faults (major+minor) */
148	unsigned long pgmajfault; /* faults (major only) */
149
150	unsigned long pgrefill_high; /* inspected in refill_inactive_zone */
151	unsigned long pgrefill_normal;
152	unsigned long pgrefill_dma32;
153	unsigned long pgrefill_dma;
154
155	unsigned long pgsteal_high; /* total highmem pages reclaimed */
156	unsigned long pgsteal_normal;
157	unsigned long pgsteal_dma32;
158	unsigned long pgsteal_dma;
159
160	unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
161	unsigned long pgscan_kswapd_normal;
162	unsigned long pgscan_kswapd_dma32;
163	unsigned long pgscan_kswapd_dma;
164
165	unsigned long pgscan_direct_high;/* total highmem pages scanned */
166	unsigned long pgscan_direct_normal;
167	unsigned long pgscan_direct_dma32;
168	unsigned long pgscan_direct_dma;
169
170	unsigned long pginodesteal; /* pages reclaimed via inode freeing */
171	unsigned long slabs_scanned; /* slab objects scanned */
172	unsigned long kswapd_steal; /* pages reclaimed by kswapd */
173	unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
174	unsigned long pageoutrun; /* kswapd's calls to page reclaim */
175	unsigned long allocstall; /* direct reclaim calls */
176
177	unsigned long pgrotated; /* pages rotated to tail of the LRU */
178	unsigned long nr_bounce; /* pages for bounce buffers */
179	};
180
181	extern void get_page_state(struct page_state *ret);
182	extern void get_page_state_node(struct page_state *ret, int node);
183	extern void get_full_page_state(struct page_state *ret);
184	extern unsigned long read_page_state_offset(unsigned long offset);
185	extern void mod_page_state_offset(unsigned long offset, unsigned long delta);
186	extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
187
188	#define read_page_state(member) \
189	read_page_state_offset(offsetof(struct page_state, member))
190
191	#define mod_page_state(member, delta) \
192	mod_page_state_offset(offsetof(struct page_state, member), (delta))
193
194	#define __mod_page_state(member, delta) \
195	__mod_page_state_offset(offsetof(struct page_state, member), (delta))
196
197	#define inc_page_state(member) mod_page_state(member, 1UL)
198	#define dec_page_state(member) mod_page_state(member, 0UL - 1)
199	#define add_page_state(member,delta) mod_page_state(member, (delta))
200	#define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta))
201
202	#define __inc_page_state(member) __mod_page_state(member, 1UL)
203	#define __dec_page_state(member) __mod_page_state(member, 0UL - 1)
204	#define __add_page_state(member,delta) __mod_page_state(member, (delta))
205	#define __sub_page_state(member,delta) __mod_page_state(member, 0UL - (delta))
206
207	#define page_state(member) (*__page_state(offsetof(struct page_state, member)))
208
209	#define state_zone_offset(zone, member) \
210	({ \
211	unsigned offset; \
212	if (is_highmem(zone)) \
213	offset = offsetof(struct page_state, member##_high); \
214	else if (is_normal(zone)) \
215	offset = offsetof(struct page_state, member##_normal); \
216	else if (is_dma32(zone)) \
217	offset = offsetof(struct page_state, member##_dma32); \
218	else \
219	offset = offsetof(struct page_state, member##_dma); \
220	offset; \
221	})
222
223	#define __mod_page_state_zone(zone, member, delta) \
224	do { \
225	__mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
226	} while (0)
227
228	#define mod_page_state_zone(zone, member, delta) \
229	do { \
230	mod_page_state_offset(state_zone_offset(zone, member), (delta)); \
231	} while (0)
232
233	/*
234	* Manipulation of page state flags	107	* Manipulation of page state flags
235	*/	108	*/
236	#define PageLocked(page) \	109	#define PageLocked(page) \
@@ -254,7 +127,13 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
254	#define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags)	127	#define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags)
255		128
256	#define PageUptodate(page) test_bit(PG_uptodate, &(page)->flags)	129	#define PageUptodate(page) test_bit(PG_uptodate, &(page)->flags)
257	#ifndef SetPageUptodate	130	#ifdef CONFIG_S390
		131	static inline void SetPageUptodate(struct page *page)
		132	{
		133	if (!test_and_set_bit(PG_uptodate, &page->flags))
		134	page_test_and_clear_dirty(page);
		135	}
		136	#else
258	#define SetPageUptodate(page) set_bit(PG_uptodate, &(page)->flags)	137	#define SetPageUptodate(page) set_bit(PG_uptodate, &(page)->flags)
259	#endif	138	#endif
260	#define ClearPageUptodate(page) clear_bit(PG_uptodate, &(page)->flags)	139	#define ClearPageUptodate(page) clear_bit(PG_uptodate, &(page)->flags)
@@ -306,7 +185,7 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
306	do { \	185	do { \
307	if (!test_and_set_bit(PG_writeback, \	186	if (!test_and_set_bit(PG_writeback, \
308	&(page)->flags)) \	187	&(page)->flags)) \
309	inc_page_state(nr_writeback); \	188	inc_zone_page_state(page, NR_WRITEBACK); \
310	} while (0)	189	} while (0)
311	#define TestSetPageWriteback(page) \	190	#define TestSetPageWriteback(page) \
312	({ \	191	({ \
@@ -314,14 +193,14 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
314	ret = test_and_set_bit(PG_writeback, \	193	ret = test_and_set_bit(PG_writeback, \
315	&(page)->flags); \	194	&(page)->flags); \
316	if (!ret) \	195	if (!ret) \
317	inc_page_state(nr_writeback); \	196	inc_zone_page_state(page, NR_WRITEBACK); \
318	ret; \	197	ret; \
319	})	198	})
320	#define ClearPageWriteback(page) \	199	#define ClearPageWriteback(page) \
321	do { \	200	do { \
322	if (test_and_clear_bit(PG_writeback, \	201	if (test_and_clear_bit(PG_writeback, \
323	&(page)->flags)) \	202	&(page)->flags)) \
324	dec_page_state(nr_writeback); \	203	dec_zone_page_state(page, NR_WRITEBACK); \
325	} while (0)	204	} while (0)
326	#define TestClearPageWriteback(page) \	205	#define TestClearPageWriteback(page) \
327	({ \	206	({ \
@@ -329,7 +208,7 @@ extern void __mod_page_state_offset(unsigned long offset, unsigned long delta);
329	ret = test_and_clear_bit(PG_writeback, \	208	ret = test_and_clear_bit(PG_writeback, \
330	&(page)->flags); \	209	&(page)->flags); \
331	if (ret) \	210	if (ret) \
332	dec_page_state(nr_writeback); \	211	dec_zone_page_state(page, NR_WRITEBACK); \
333	ret; \	212	ret; \
334	})	213	})
335		214