xen-balloon: clean up unused functions

Remove some unused functions:

balloon_update_driver_allowance
balloon_release_driver_page
	only used on the (obsolete, removed) flip path in netfront
alloc_empty_pages_and_pagevec
free_empty_pages_and_pagevec
	only used in backend drivers; can be reintroduced when needed

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 144 deletions

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index cdec2d843e4c..fff987b10e0f 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -226,9 +226,8 @@ static int increase_reservation(unsigned long nr_pages)
         }
 
         set_xen_guest_handle(reservation.extent_start, frame_list);
-        reservation.nr_extents   = nr_pages;
-        rc = HYPERVISOR_memory_op(
-                XENMEM_populate_physmap, &reservation);
+        reservation.nr_extents = nr_pages;
+        rc = HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
         if (rc < nr_pages) {
                 if (rc > 0) {
                         int ret;
@@ -236,7 +235,7 @@ static int increase_reservation(unsigned long nr_pages)
                         /* We hit the Xen hard limit: reprobe. */
                         reservation.nr_extents = rc;
                         ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
-                                        &reservation);
+                                                   &reservation);
                         BUG_ON(ret != rc);
                 }
                 if (rc >= 0)
@@ -464,130 +463,6 @@ static void balloon_exit(void)
 
 module_exit(balloon_exit);
 
-static void balloon_update_driver_allowance(long delta)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&balloon_lock, flags);
-        balloon_stats.driver_pages += delta;
-        spin_unlock_irqrestore(&balloon_lock, flags);
-}
-
-static int dealloc_pte_fn(
-        pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
-{
-        unsigned long mfn = pte_mfn(*pte);
-        int ret;
-        struct xen_memory_reservation reservation = {
-                .nr_extents   = 1,
-                .extent_order = 0,
-                .domid        = DOMID_SELF
-        };
-        set_xen_guest_handle(reservation.extent_start, &mfn);
-        set_pte_at(&init_mm, addr, pte, __pte_ma(0ull));
-        set_phys_to_machine(__pa(addr) >> PAGE_SHIFT, INVALID_P2M_ENTRY);
-        ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
-        BUG_ON(ret != 1);
-        return 0;
-}
-
-static struct page **alloc_empty_pages_and_pagevec(int nr_pages)
-{
-        unsigned long vaddr, flags;
-        struct page *page, **pagevec;
-        int i, ret;
-
-        pagevec = kmalloc(sizeof(page) * nr_pages, GFP_KERNEL);
-        if (pagevec == NULL)
-                return NULL;
-
-        for (i = 0; i < nr_pages; i++) {
-                page = pagevec[i] = alloc_page(GFP_KERNEL);
-                if (page == NULL)
-                        goto err;
-
-                vaddr = (unsigned long)page_address(page);
-
-                scrub_page(page);
-
-                spin_lock_irqsave(&balloon_lock, flags);
-
-                if (xen_feature(XENFEAT_auto_translated_physmap)) {
-                        unsigned long gmfn = page_to_pfn(page);
-                        struct xen_memory_reservation reservation = {
-                                .nr_extents   = 1,
-                                .extent_order = 0,
-                                .domid        = DOMID_SELF
-                        };
-                        set_xen_guest_handle(reservation.extent_start, &gmfn);
-                        ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
-                                                   &reservation);
-                        if (ret == 1)
-                                ret = 0; /* success */
-                } else {
-                        ret = apply_to_page_range(&init_mm, vaddr, PAGE_SIZE,
-                                                  dealloc_pte_fn, NULL);
-                }
-
-                if (ret != 0) {
-                        spin_unlock_irqrestore(&balloon_lock, flags);
-                        __free_page(page);
-                        goto err;
-                }
-
-                totalram_pages = --balloon_stats.current_pages;
-
-                spin_unlock_irqrestore(&balloon_lock, flags);
-        }
-
- out:
-        schedule_work(&balloon_worker);
-        flush_tlb_all();
-        return pagevec;
-
- err:
-        spin_lock_irqsave(&balloon_lock, flags);
-        while (--i >= 0)
-                balloon_append(pagevec[i]);
-        spin_unlock_irqrestore(&balloon_lock, flags);
-        kfree(pagevec);
-        pagevec = NULL;
-        goto out;
-}
-
-static void free_empty_pages_and_pagevec(struct page **pagevec, int nr_pages)
-{
-        unsigned long flags;
-        int i;
-
-        if (pagevec == NULL)
-                return;
-
-        spin_lock_irqsave(&balloon_lock, flags);
-        for (i = 0; i < nr_pages; i++) {
-                BUG_ON(page_count(pagevec[i]) != 1);
-                balloon_append(pagevec[i]);
-        }
-        spin_unlock_irqrestore(&balloon_lock, flags);
-
-        kfree(pagevec);
-
-        schedule_work(&balloon_worker);
-}
-
-static void balloon_release_driver_page(struct page *page)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&balloon_lock, flags);
-        balloon_append(page);
-        balloon_stats.driver_pages--;
-        spin_unlock_irqrestore(&balloon_lock, flags);
-
-        schedule_work(&balloon_worker);
-}
-
-
 #define BALLOON_SHOW(name, format, args...)                             \
         static ssize_t show_##name(struct sys_device *dev,              \
                                    struct sysdev_attribute *attr,       \
@@ -691,20 +566,4 @@ static int register_balloon(struct sys_device *sysdev)
         return error;
 }
 
-static void unregister_balloon(struct sys_device *sysdev)
-{
-        int i;
-
-        sysfs_remove_group(&sysdev->kobj, &balloon_info_group);
-        for (i = 0; i < ARRAY_SIZE(balloon_attrs); i++)
-                sysdev_remove_file(sysdev, balloon_attrs[i]);
-        sysdev_unregister(sysdev);
-        sysdev_class_unregister(&balloon_sysdev_class);
-}
-
-static void balloon_sysfs_exit(void)
-{
-        unregister_balloon(&balloon_sysdev);
-}
-
 MODULE_LICENSE("GPL");