include/linux/mmzone.h: clean up watermark accessors

- we have a helper wmark_pages().  Teach min_wmark_pages(),
  low_wmark_pages(), high_wmark_pages() and promo_wmark_pages() to use
  it instead of open-coding its implementation.

- there's no reason to implement all these things as macros.  Redo them
  in C.

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kaiyang Zhao <kaiyang2@cs.cmu.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 9f3589f7f05c3fa5f873760799d5acf20101392a..17506e4a283559921c289727488d43100ba9ad77 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -666,12 +666,6 @@ enum zone_watermarks {
 #define NR_LOWORDER_PCP_LISTS (MIGRATE_PCPTYPES * (PAGE_ALLOC_COSTLY_ORDER + 1))
 #define NR_PCP_LISTS (NR_LOWORDER_PCP_LISTS + NR_PCP_THP)
 
-#define min_wmark_pages(z) (z->_watermark[WMARK_MIN] + z->watermark_boost)
-#define low_wmark_pages(z) (z->_watermark[WMARK_LOW] + z->watermark_boost)
-#define high_wmark_pages(z) (z->_watermark[WMARK_HIGH] + z->watermark_boost)
-#define promo_wmark_pages(z) (z->_watermark[WMARK_PROMO] + z->watermark_boost)
-#define wmark_pages(z, i) (z->_watermark[i] + z->watermark_boost)
-
 /*
  * Flags used in pcp->flags field.
  *
@@ -1017,6 +1011,32 @@ enum zone_flags {
        ZONE_BELOW_HIGH,                /* zone is below high watermark. */
 };
 
+static inline unsigned long wmark_pages(const struct zone *z,
+                                       enum zone_watermarks w)
+{
+       return z->_watermark[w] + z->watermark_boost;
+}
+
+static inline unsigned long min_wmark_pages(const struct zone *z)
+{
+       return wmark_pages(z, WMARK_MIN);
+}
+
+static inline unsigned long low_wmark_pages(const struct zone *z)
+{
+       return wmark_pages(z, WMARK_LOW);
+}
+
+static inline unsigned long high_wmark_pages(const struct zone *z)
+{
+       return wmark_pages(z, WMARK_HIGH);
+}
+
+static inline unsigned long promo_wmark_pages(const struct zone *z)
+{
+       return wmark_pages(z, WMARK_PROMO);
+}
+
 static inline unsigned long zone_managed_pages(struct zone *zone)
 {
        return (unsigned long)atomic_long_read(&zone->managed_pages);