ALSA: usb-audio: Fix races at disconnection

[pandora-kernel.git] / mm / huge_memory.c

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 4298aba..8f005e9 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -642,6 +642,7 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
                set_pmd_at(mm, haddr, pmd, entry);
                prepare_pmd_huge_pte(pgtable, mm);
                add_mm_counter(mm, MM_ANONPAGES, HPAGE_PMD_NR);
+               mm->nr_ptes++;
                spin_unlock(&mm->page_table_lock);
        }
 
@@ -760,6 +761,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
        pmd = pmd_mkold(pmd_wrprotect(pmd));
        set_pmd_at(dst_mm, addr, dst_pmd, pmd);
        prepare_pmd_huge_pte(pgtable, dst_mm);
+       dst_mm->nr_ptes++;
 
        ret = 0;
 out_unlock:
@@ -858,7 +860,6 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
        }
        kfree(pages);
 
-       mm->nr_ptes++;
        smp_wmb(); /* make pte visible before pmd */
        pmd_populate(mm, pmd, pgtable);
        page_remove_rmap(page);
@@ -1017,6 +1018,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
                        VM_BUG_ON(page_mapcount(page) < 0);
                        add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
                        VM_BUG_ON(!PageHead(page));
+                       tlb->mm->nr_ptes--;
                        spin_unlock(&tlb->mm->page_table_lock);
                        tlb_remove_page(tlb, page);
                        pte_free(tlb->mm, pgtable);
@@ -1356,7 +1358,6 @@ static int __split_huge_page_map(struct page *page,
                        pte_unmap(pte);
                }
 
-               mm->nr_ptes++;
                smp_wmb(); /* make pte visible before pmd */
                /*
                 * Up to this point the pmd is present and huge and
@@ -1969,7 +1970,6 @@ static void collapse_huge_page(struct mm_struct *mm,
        set_pmd_at(mm, address, pmd, _pmd);
        update_mmu_cache(vma, address, _pmd);
        prepare_pmd_huge_pte(pgtable, mm);
-       mm->nr_ptes--;
        spin_unlock(&mm->page_table_lock);
 
 #ifndef CONFIG_NUMA
@@ -2064,7 +2064,7 @@ static void collect_mm_slot(struct mm_slot *mm_slot)
 {
        struct mm_struct *mm = mm_slot->mm;
 
-       VM_BUG_ON(!spin_is_locked(&khugepaged_mm_lock));
+       VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&khugepaged_mm_lock));
 
        if (khugepaged_test_exit(mm)) {
                /* free mm_slot */
@@ -2094,7 +2094,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
        int progress = 0;
 
        VM_BUG_ON(!pages);
-       VM_BUG_ON(!spin_is_locked(&khugepaged_mm_lock));
+       VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&khugepaged_mm_lock));
 
        if (khugepaged_scan.mm_slot)
                mm_slot = khugepaged_scan.mm_slot;
@@ -2259,12 +2259,8 @@ static void khugepaged_do_scan(struct page **hpage)
 
 static void khugepaged_alloc_sleep(void)
 {
-       DEFINE_WAIT(wait);
-       add_wait_queue(&khugepaged_wait, &wait);
-       schedule_timeout_interruptible(
-               msecs_to_jiffies(
-                       khugepaged_alloc_sleep_millisecs));
-       remove_wait_queue(&khugepaged_wait, &wait);
+       wait_event_freezable_timeout(khugepaged_wait, false,
+                       msecs_to_jiffies(khugepaged_alloc_sleep_millisecs));
 }
 
 #ifndef CONFIG_NUMA
@@ -2313,14 +2309,10 @@ static void khugepaged_loop(void)
                if (unlikely(kthread_should_stop()))
                        break;
                if (khugepaged_has_work()) {
-                       DEFINE_WAIT(wait);
                        if (!khugepaged_scan_sleep_millisecs)
                                continue;
-                       add_wait_queue(&khugepaged_wait, &wait);
-                       schedule_timeout_interruptible(
-                               msecs_to_jiffies(
-                                       khugepaged_scan_sleep_millisecs));
-                       remove_wait_queue(&khugepaged_wait, &wait);
+                       wait_event_freezable_timeout(khugepaged_wait, false,
+                           msecs_to_jiffies(khugepaged_scan_sleep_millisecs));
                } else if (khugepaged_enabled())
                        wait_event_freezable(khugepaged_wait,
                                             khugepaged_wait_event());