From 24c9ad6beda506c7e28b00402fd2eaaea8f5b26b Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Thu, 19 Dec 2002 07:23:46 +0000
Subject: [PATCH]  - Remove vm_page_sleep_busy().  The transition to
 vm_page_sleep_if_busy(),    which incorporates page queue and field locking,
 is complete.  - Assert that the page queue lock rather than Giant is held in 
   vm_page_flag_set().

---
 sys/vm/vm_page.c | 36 ++----------------------------------
 sys/vm/vm_page.h |  1 -
 2 files changed, 2 insertions(+), 35 deletions(-)

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index ee23febe4c8..4a0454f155e 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -277,7 +277,8 @@ vm_page_startup(vm_offset_t starta, vm_offset_t enda, vm_offset_t vaddr)
 void
 vm_page_flag_set(vm_page_t m, unsigned short bits)
 {
-	GIANT_REQUIRED;
+
+	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
 	m->flags |= bits;
 } 
 
@@ -413,39 +414,6 @@ vm_page_free_zero(vm_page_t m)
 	vm_page_free_toq(m);
 }
 
-/*
- *	vm_page_sleep_busy:
- *
- *	Wait until page is no longer PG_BUSY or (if also_m_busy is TRUE)
- *	m->busy is zero.  Returns TRUE if it had to sleep ( including if
- *	it almost had to sleep and made temporary spl*() mods), FALSE
- *	otherwise.
- *
- *	This routine assumes that interrupts can only remove the busy
- *	status from a page, not set the busy status or change it from
- *	PG_BUSY to m->busy or vise versa (which would create a timing
- *	window).
- */
-int
-vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg)
-{
-	GIANT_REQUIRED;
-	if ((m->flags & PG_BUSY) || (also_m_busy && m->busy))  {
-		int s = splvm();
-		if ((m->flags & PG_BUSY) || (also_m_busy && m->busy)) {
-			/*
-			 * Page is busy. Wait and retry.
-			 */
-			vm_page_flag_set(m, PG_WANTED | PG_REFERENCED);
-			tsleep(m, PVM, msg, 0);
-		}
-		splx(s);
-		return (TRUE);
-		/* not reached */
-	}
-	return (FALSE);
-}
-
 /*
  *	vm_page_sleep_if_busy:
  *
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h
index 72cf4ebc651..67e35298344 100644
--- a/sys/vm/vm_page.h
+++ b/sys/vm/vm_page.h
@@ -330,7 +330,6 @@ void vm_page_unhold(vm_page_t mem);
 void vm_page_copy(vm_page_t src_m, vm_page_t dest_m);
 void vm_page_free(vm_page_t m);
 void vm_page_free_zero(vm_page_t m);
-int vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg);
 int vm_page_sleep_if_busy(vm_page_t m, int also_m_busy, const char *msg);
 void vm_page_dirty(vm_page_t m);
 void vm_page_wakeup(vm_page_t m);