diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
index 73f333f491bd..4d5ed18dad00 100644
--- a/drivers/char/agp/backend.c
+++ b/drivers/char/agp/backend.c
@@ -147,6 +147,7 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
 			printk(KERN_ERR PFX "unable to get memory for scratch page.\n");
 			return -ENOMEM;
 		}
+		global_flush_tlb();
 
 		bridge->scratch_page_real = virt_to_gart(addr);
 		bridge->scratch_page =
@@ -187,9 +188,11 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
 	return 0;
 
 err_out:
-	if (bridge->driver->needs_scratch_page)
+	if (bridge->driver->needs_scratch_page) {
 		bridge->driver->agp_destroy_page(
 				gart_to_virt(bridge->scratch_page_real));
+		global_flush_tlb();
+	}
 	if (got_gatt)
 		bridge->driver->free_gatt_table(bridge);
 	if (got_keylist) {
@@ -211,9 +214,11 @@ static void agp_backend_cleanup(struct agp_bridge_data *bridge)
 	bridge->key_list = NULL;
 
 	if (bridge->driver->agp_destroy_page &&
-	    bridge->driver->needs_scratch_page)
+	    bridge->driver->needs_scratch_page) {
 		bridge->driver->agp_destroy_page(
 				gart_to_virt(bridge->scratch_page_real));
+		global_flush_tlb();
+	}
 }
 
 /* When we remove the global variable agp_bridge from all drivers
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index c4a38715c6f9..19f242b50781 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -57,7 +57,8 @@ int map_page_into_agp(struct page *page)
 {
 	int i;
 	i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
-	global_flush_tlb();
+	/* Caller's responsibility to call global_flush_tlb() for
+	 * performance reasons */
 	return i;
 }
 EXPORT_SYMBOL_GPL(map_page_into_agp);
@@ -66,7 +67,8 @@ int unmap_page_from_agp(struct page *page)
 {
 	int i;
 	i = change_page_attr(page, 1, PAGE_KERNEL);
-	global_flush_tlb();
+	/* Caller's responsibility to call global_flush_tlb() for
+	 * performance reasons */
 	return i;
 }
 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
@@ -153,6 +155,7 @@ void agp_free_memory(struct agp_memory *curr)
 		for (i = 0; i < curr->page_count; i++) {
 			curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
 		}
+		global_flush_tlb();
 	}
 	agp_free_key(curr->key);
 	vfree(curr->memory);
@@ -210,7 +213,9 @@ struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 		new->memory[i] = virt_to_gart(addr);
 		new->page_count++;
 	}
-       new->bridge = bridge;
+	global_flush_tlb();
+
+	new->bridge = bridge;
 
 	flush_agp_mappings();
 
diff --git a/drivers/char/agp/i460-agp.c b/drivers/char/agp/i460-agp.c
index 58944cd271ea..34a444658ffe 100644
--- a/drivers/char/agp/i460-agp.c
+++ b/drivers/char/agp/i460-agp.c
@@ -111,8 +111,10 @@ static int i460_fetch_size (void)
 
 	if (i460.io_page_shift != I460_IO_PAGE_SHIFT) {
 		printk(KERN_ERR PFX
-		       "I/O (GART) page-size %ZuKB doesn't match expected size %ZuKB\n",
-		       1UL << (i460.io_page_shift - 10), 1UL << (I460_IO_PAGE_SHIFT));
+			"I/O (GART) page-size %luKB doesn't match expected "
+				"size %luKB\n",
+			1UL << (i460.io_page_shift - 10),
+			1UL << (I460_IO_PAGE_SHIFT));
 		return 0;
 	}
 
@@ -514,9 +516,10 @@ static void *i460_alloc_page (struct agp_bridge_data *bridge)
 {
 	void *page;
 
-	if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT)
+	if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
 		page = agp_generic_alloc_page(agp_bridge);
-	else
+		global_flush_tlb();
+	} else
 		/* Returning NULL would cause problems */
 		/* AK: really dubious code. */
 		page = (void *)~0UL;
@@ -525,8 +528,10 @@ static void *i460_alloc_page (struct agp_bridge_data *bridge)
 
 static void i460_destroy_page (void *page)
 {
-	if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT)
+	if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
 		agp_generic_destroy_page(page);
+		global_flush_tlb();
+	}
 }
 
 #endif /* I460_LARGE_IO_PAGES */
@@ -536,7 +541,7 @@ static unsigned long i460_mask_memory (struct agp_bridge_data *bridge,
 {
 	/* Make sure the returned address is a valid GATT entry */
 	return bridge->driver->masks[0].mask
-		| (((addr & ~((1 << I460_IO_PAGE_SHIFT) - 1)) & 0xffffff000) >> 12);
+		| (((addr & ~((1 << I460_IO_PAGE_SHIFT) - 1)) & 0xfffff000) >> 12);
 }
 
 struct agp_bridge_driver intel_i460_driver = {
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index bf4cc9ffd5b1..027161ab88e9 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -270,6 +270,7 @@ static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
 
 	switch (pg_count) {
 	case 1: addr = agp_bridge->driver->agp_alloc_page(agp_bridge);
+		global_flush_tlb();
 		break;
 	case 4:
 		/* kludge to get 4 physical pages for ARGB cursor */
@@ -330,9 +331,11 @@ static void intel_i810_free_by_type(struct agp_memory *curr)
 	if(curr->type == AGP_PHYS_MEMORY) {
 		if (curr->page_count == 4)
 			i8xx_destroy_pages(gart_to_virt(curr->memory[0]));
-		else
+		else {
 			agp_bridge->driver->agp_destroy_page(
 				 gart_to_virt(curr->memory[0]));
+			global_flush_tlb();
+		}
 		vfree(curr->memory);
 	}
 	kfree(curr);