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Subject[RFC v2 3/5] Move page initialization into a separate function.
Date
From: Robin Holt <holt@sgi.com>

Currently, memmap_init_zone() has all the smarts for initializing a
single page. When we convert to initializing pages in a 2MiB chunk,
we will need to do this equivalent work from two separate places
so we are breaking out a helper function.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Nathan Zimmer <nzimmer@sgi.com>
To: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Cc: Linux MM <linux-mm@kvack.org>
Cc: Rob Landley <rob@landley.net>
Cc: Mike Travis <travis@sgi.com>
Cc: Daniel J Blueman <daniel@numascale-asia.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
---
mm/mm_init.c | 2 +-
mm/page_alloc.c | 73 +++++++++++++++++++++++++++++++--------------------------
2 files changed, 41 insertions(+), 34 deletions(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index c280a02..be8a539 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -128,7 +128,7 @@ void __init mminit_verify_pageflags_layout(void)
BUG_ON(or_mask != add_mask);
}

-void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
+void mminit_verify_page_links(struct page *page, enum zone_type zone,
unsigned long nid, unsigned long pfn)
{
BUG_ON(page_to_nid(page) != nid);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5adf81e..df3ec13 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -697,6 +697,45 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
spin_unlock(&zone->lock);
}

+static void __init_single_page(unsigned long pfn, unsigned long zone, int nid)
+{
+ struct page *page = pfn_to_page(pfn);
+ struct zone *z = &NODE_DATA(nid)->node_zones[zone];
+
+ set_page_links(page, zone, nid, pfn);
+ mminit_verify_page_links(page, zone, nid, pfn);
+ init_page_count(page);
+ page_mapcount_reset(page);
+ page_nid_reset_last(page);
+ SetPageReserved(page);
+
+ /*
+ * Mark the block movable so that blocks are reserved for
+ * movable at startup. This will force kernel allocations
+ * to reserve their blocks rather than leaking throughout
+ * the address space during boot when many long-lived
+ * kernel allocations are made. Later some blocks near
+ * the start are marked MIGRATE_RESERVE by
+ * setup_zone_migrate_reserve()
+ *
+ * bitmap is created for zone's valid pfn range. but memmap
+ * can be created for invalid pages (for alignment)
+ * check here not to call set_pageblock_migratetype() against
+ * pfn out of zone.
+ */
+ if ((z->zone_start_pfn <= pfn)
+ && (pfn < zone_end_pfn(z))
+ && !(pfn & (pageblock_nr_pages - 1)))
+ set_pageblock_migratetype(page, MIGRATE_MOVABLE);
+
+ INIT_LIST_HEAD(&page->lru);
+#ifdef WANT_PAGE_VIRTUAL
+ /* The shift won't overflow because ZONE_NORMAL is below 4G. */
+ if (!is_highmem_idx(zone))
+ set_page_address(page, __va(pfn << PAGE_SHIFT));
+#endif
+}
+
static bool free_pages_prepare(struct page *page, unsigned int order)
{
int i;
@@ -3951,7 +3990,6 @@ static void setup_zone_migrate_reserve(struct zone *zone)
void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
unsigned long start_pfn, enum memmap_context context)
{
- struct page *page;
unsigned long end_pfn = start_pfn + size;
unsigned long pfn;
struct zone *z;
@@ -3972,38 +4010,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
if (!early_pfn_in_nid(pfn, nid))
continue;
}
- page = pfn_to_page(pfn);
- set_page_links(page, zone, nid, pfn);
- mminit_verify_page_links(page, zone, nid, pfn);
- init_page_count(page);
- page_mapcount_reset(page);
- page_nid_reset_last(page);
- SetPageReserved(page);
- /*
- * Mark the block movable so that blocks are reserved for
- * movable at startup. This will force kernel allocations
- * to reserve their blocks rather than leaking throughout
- * the address space during boot when many long-lived
- * kernel allocations are made. Later some blocks near
- * the start are marked MIGRATE_RESERVE by
- * setup_zone_migrate_reserve()
- *
- * bitmap is created for zone's valid pfn range. but memmap
- * can be created for invalid pages (for alignment)
- * check here not to call set_pageblock_migratetype() against
- * pfn out of zone.
- */
- if ((z->zone_start_pfn <= pfn)
- && (pfn < zone_end_pfn(z))
- && !(pfn & (pageblock_nr_pages - 1)))
- set_pageblock_migratetype(page, MIGRATE_MOVABLE);
-
- INIT_LIST_HEAD(&page->lru);
-#ifdef WANT_PAGE_VIRTUAL
- /* The shift won't overflow because ZONE_NORMAL is below 4G. */
- if (!is_highmem_idx(zone))
- set_page_address(page, __va(pfn << PAGE_SHIFT));
-#endif
+ __init_single_page(pfn, zone, nid);
}
}

--
1.8.2.1


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