From 56b6a703a500930a3a82648d510bce10b2dc47de Mon Sep 17 00:00:00 2001
From: kib <kib@FreeBSD.org>
Date: Sun, 4 Jul 2010 11:13:33 +0000
Subject: Introduce a helper function vm_page_find_least(). Use it in several
 places, which inline the function.

Reviewed by:	alc
Tested by:	pho
MFC after:	1 week
---
 sys/vm/vm_map.c    |  8 +-------
 sys/vm/vm_object.c | 16 ++--------------
 sys/vm/vm_page.c   | 25 +++++++++++++++++++++++++
 sys/vm/vm_page.h   |  1 +
 4 files changed, 29 insertions(+), 21 deletions(-)

(limited to 'sys/vm')

diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
index 3ef93a3..c4089c6 100644
--- a/sys/vm/vm_map.c
+++ b/sys/vm/vm_map.c
@@ -1750,13 +1750,7 @@ vm_map_pmap_enter(vm_map_t map, vm_offset_t addr, vm_prot_t prot,
 	start = 0;
 	p_start = NULL;
 
-	if ((p = TAILQ_FIRST(&object->memq)) != NULL) {
-		if (p->pindex < pindex) {
-			p = vm_page_splay(pindex, object->root);
-			if ((object->root = p)->pindex < pindex)
-				p = TAILQ_NEXT(p, listq);
-		}
-	}
+	p = vm_page_find_least(object, pindex);
 	/*
 	 * Assert: the variable p is either (1) the page with the
 	 * least pindex greater than or equal to the parameter pindex
diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
index ae7af15..11284ab 100644
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -1400,13 +1400,7 @@ vm_object_split(vm_map_entry_t entry)
 		orig_object->charge -= ptoa(size);
 	}
 retry:
-	if ((m = TAILQ_FIRST(&orig_object->memq)) != NULL) {
-		if (m->pindex < offidxstart) {
-			m = vm_page_splay(offidxstart, orig_object->root);
-			if ((orig_object->root = m)->pindex < offidxstart)
-				m = TAILQ_NEXT(m, listq);
-		}
-	}
+	m = vm_page_find_least(orig_object, offidxstart);
 	for (; m != NULL && (idx = m->pindex - offidxstart) < size;
 	    m = m_next) {
 		m_next = TAILQ_NEXT(m, listq);
@@ -1910,13 +1904,7 @@ vm_object_page_remove(vm_object_t object, vm_pindex_t start, vm_pindex_t end,
 
 	vm_object_pip_add(object, 1);
 again:
-	if ((p = TAILQ_FIRST(&object->memq)) != NULL) {
-		if (p->pindex < start) {
-			p = vm_page_splay(start, object->root);
-			if ((object->root = p)->pindex < start)
-				p = TAILQ_NEXT(p, listq);
-		}
-	}
+	p = vm_page_find_least(object, start);
 
 	/*
 	 * Assert: the variable p is either (1) the page with the
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index fc9fdd4..6659e76 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -879,6 +879,31 @@ vm_page_lookup(vm_object_t object, vm_pindex_t pindex)
 }
 
 /*
+ *	vm_page_find_least:
+ *
+ *	Returns the page associated with the object with least pindex
+ *	greater than or equal to the parameter pindex, or NULL.
+ *
+ *	The object must be locked.
+ *	The routine may not block.
+ */
+vm_page_t
+vm_page_find_least(vm_object_t object, vm_pindex_t pindex)
+{
+	vm_page_t m;
+
+	VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
+	if ((m = TAILQ_FIRST(&object->memq)) != NULL) {
+		if (m->pindex < pindex) {
+			m = vm_page_splay(pindex, object->root);
+			if ((object->root = m)->pindex < pindex)
+				m = TAILQ_NEXT(m, listq);
+		}
+	}
+	return (m);
+}
+
+/*
  * Returns the given page's successor (by pindex) within the object if it is
  * resident; if none is found, NULL is returned.
  *
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h
index 54b9edd..c769a7b 100644
--- a/sys/vm/vm_page.h
+++ b/sys/vm/vm_page.h
@@ -345,6 +345,7 @@ int vm_page_try_to_cache (vm_page_t);
 int vm_page_try_to_free (vm_page_t);
 void vm_page_dontneed(vm_page_t);
 void vm_page_deactivate (vm_page_t);
+vm_page_t vm_page_find_least(vm_object_t, vm_pindex_t);
 void vm_page_insert (vm_page_t, vm_object_t, vm_pindex_t);
 vm_page_t vm_page_lookup (vm_object_t, vm_pindex_t);
 vm_page_t vm_page_next(vm_page_t m);
-- 
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