Merge tag 'asoc-v3.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Updates for v3.10

A series of driver specific updates, none particularly critical, plus
one fix to the compressed API code to handle capture streams properly
which is very safe for mainline as there's no current users.

7 files changed, 101 insertions, 82 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 03a89a2f464b..362c329b83fe 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2325,7 +2325,12 @@ static void collapse_huge_page(struct mm_struct *mm,
 		pte_unmap(pte);
 		spin_lock(&mm->page_table_lock);
 		BUG_ON(!pmd_none(*pmd));
-		set_pmd_at(mm, address, pmd, _pmd);
+		/*
+		 * We can only use set_pmd_at when establishing
+		 * hugepmds and never for establishing regular pmds that
+		 * points to regular pagetables. Use pmd_populate for that
+		 */
+		pmd_populate(mm, pmd, pmd_pgtable(_pmd));
 		spin_unlock(&mm->page_table_lock);
 		anon_vma_unlock_write(vma->anon_vma);
 		goto out;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index cb1c9dedf9b6..010d6c14129a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4108,8 +4108,6 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype,
 	if (mem_cgroup_disabled())
 		return NULL;
 
-	VM_BUG_ON(PageSwapCache(page));
-
 	if (PageTransHuge(page)) {
 		nr_pages <<= compound_order(page);
 		VM_BUG_ON(!PageTransHuge(page));
@@ -4205,6 +4203,18 @@ void mem_cgroup_uncharge_page(struct page *page)
 	if (page_mapped(page))
 		return;
 	VM_BUG_ON(page->mapping && !PageAnon(page));
+	/*
+	 * If the page is in swap cache, uncharge should be deferred
+	 * to the swap path, which also properly accounts swap usage
+	 * and handles memcg lifetime.
+	 *
+	 * Note that this check is not stable and reclaim may add the
+	 * page to swap cache at any time after this.  However, if the
+	 * page is not in swap cache by the time page->mapcount hits
+	 * 0, there won't be any page table references to the swap
+	 * slot, and reclaim will free it and not actually write the
+	 * page to disk.
+	 */
 	if (PageSwapCache(page))
 		return;
 	__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_ANON, false);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a221fac1f47d..1ad92b46753e 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -720,9 +720,12 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
 	start = phys_start_pfn << PAGE_SHIFT;
 	size = nr_pages * PAGE_SIZE;
 	ret = release_mem_region_adjustable(&iomem_resource, start, size);
-	if (ret)
-		pr_warn("Unable to release resource <%016llx-%016llx> (%d)\n",
-				start, start + size - 1, ret);
+	if (ret) {
+		resource_size_t endres = start + size - 1;
+
+		pr_warn("Unable to release resource <%pa-%pa> (%d)\n",
+				&start, &endres, ret);
+	}
 
 	sections_to_remove = nr_pages / PAGES_PER_SECTION;
 	for (i = 0; i < sections_to_remove; i++) {
diff --git a/mm/migrate.c b/mm/migrate.c
index 27ed22579fd9..b1f57501de9c 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -165,7 +165,7 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
 		pte = arch_make_huge_pte(pte, vma, new, 0);
 	}
 #endif
-	flush_cache_page(vma, addr, pte_pfn(pte));
+	flush_dcache_page(new);
 	set_pte_at(mm, addr, ptep, pte);
 
 	if (PageHuge(new)) {
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index be04122fb277..6725ff183374 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -40,48 +40,44 @@ void __mmu_notifier_release(struct mm_struct *mm)
 	int id;
 
 	/*
-	 * srcu_read_lock() here will block synchronize_srcu() in
-	 * mmu_notifier_unregister() until all registered
-	 * ->release() callouts this function makes have
-	 * returned.
+	 * SRCU here will block mmu_notifier_unregister until
+	 * ->release returns.
 	 */
 	id = srcu_read_lock(&srcu);
+	hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist)
+		/*
+		 * If ->release runs before mmu_notifier_unregister it must be
+		 * handled, as it's the only way for the driver to flush all
+		 * existing sptes and stop the driver from establishing any more
+		 * sptes before all the pages in the mm are freed.
+		 */
+		if (mn->ops->release)
+			mn->ops->release(mn, mm);
+	srcu_read_unlock(&srcu, id);
+
 	spin_lock(&mm->mmu_notifier_mm->lock);
 	while (unlikely(!hlist_empty(&mm->mmu_notifier_mm->list))) {
 		mn = hlist_entry(mm->mmu_notifier_mm->list.first,
 				 struct mmu_notifier,
 				 hlist);
-
 		/*
-		 * Unlink.  This will prevent mmu_notifier_unregister()
-		 * from also making the ->release() callout.
+		 * We arrived before mmu_notifier_unregister so
+		 * mmu_notifier_unregister will do nothing other than to wait
+		 * for ->release to finish and for mmu_notifier_unregister to
+		 * return.
 		 */
 		hlist_del_init_rcu(&mn->hlist);
-		spin_unlock(&mm->mmu_notifier_mm->lock);
-
-		/*
-		 * Clear sptes. (see 'release' description in mmu_notifier.h)
-		 */
-		if (mn->ops->release)
-			mn->ops->release(mn, mm);
-
-		spin_lock(&mm->mmu_notifier_mm->lock);
 	}
 	spin_unlock(&mm->mmu_notifier_mm->lock);
 
 	/*
-	 * All callouts to ->release() which we have done are complete.
-	 * Allow synchronize_srcu() in mmu_notifier_unregister() to complete
-	 */
-	srcu_read_unlock(&srcu, id);
-
-	/*
-	 * mmu_notifier_unregister() may have unlinked a notifier and may
-	 * still be calling out to it.	Additionally, other notifiers
-	 * may have been active via vmtruncate() et. al. Block here
-	 * to ensure that all notifier callouts for this mm have been
-	 * completed and the sptes are really cleaned up before returning
-	 * to exit_mmap().
+	 * synchronize_srcu here prevents mmu_notifier_release from returning to
+	 * exit_mmap (which would proceed with freeing all pages in the mm)
+	 * until the ->release method returns, if it was invoked by
+	 * mmu_notifier_unregister.
+	 *
+	 * The mmu_notifier_mm can't go away from under us because one mm_count
+	 * is held by exit_mmap.
 	 */
 	synchronize_srcu(&srcu);
 }
@@ -292,31 +288,34 @@ void mmu_notifier_unregister(struct mmu_notifier *mn, struct mm_struct *mm)
 {
 	BUG_ON(atomic_read(&mm->mm_count) <= 0);
 
-	spin_lock(&mm->mmu_notifier_mm->lock);
 	if (!hlist_unhashed(&mn->hlist)) {
+		/*
+		 * SRCU here will force exit_mmap to wait for ->release to
+		 * finish before freeing the pages.
+		 */
 		int id;
 
+		id = srcu_read_lock(&srcu);
 		/*
-		 * Ensure we synchronize up with __mmu_notifier_release().
+		 * exit_mmap will block in mmu_notifier_release to guarantee
+		 * that ->release is called before freeing the pages.
 		 */
-		id = srcu_read_lock(&srcu);
-
-		hlist_del_rcu(&mn->hlist);
-		spin_unlock(&mm->mmu_notifier_mm->lock);
-
 		if (mn->ops->release)
 			mn->ops->release(mn, mm);
+		srcu_read_unlock(&srcu, id);
 
+		spin_lock(&mm->mmu_notifier_mm->lock);
 		/*
-		 * Allow __mmu_notifier_release() to complete.
+		 * Can not use list_del_rcu() since __mmu_notifier_release
+		 * can delete it before we hold the lock.
 		 */
-		srcu_read_unlock(&srcu, id);
-	} else
+		hlist_del_init_rcu(&mn->hlist);
 		spin_unlock(&mm->mmu_notifier_mm->lock);
+	}
 
 	/*
-	 * Wait for any running method to finish, including ->release() if it
-	 * was run by __mmu_notifier_release() instead of us.
+	 * Wait for any running method to finish, of course including
+	 * ->release if it was run by mmu_notifier_relase instead of us.
 	 */
 	synchronize_srcu(&srcu);
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 98cbdf6e5532..378a15bcd649 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5158,7 +5158,7 @@ unsigned long free_reserved_area(unsigned long start, unsigned long end,
 	for (pages = 0; pos < end; pos += PAGE_SIZE, pages++) {
 		if (poison)
 			memset((void *)pos, poison, PAGE_SIZE);
-		free_reserved_page(virt_to_page(pos));
+		free_reserved_page(virt_to_page((void *)pos));
 	}
 
 	if (pages && s)
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 35aa294656cd..5da2cbcfdbb5 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -127,28 +127,7 @@ static int walk_hugetlb_range(struct vm_area_struct *vma,
 	return 0;
 }
 
-static struct vm_area_struct* hugetlb_vma(unsigned long addr, struct mm_walk *walk)
-{
-	struct vm_area_struct *vma;
-
-	/* We don't need vma lookup at all. */
-	if (!walk->hugetlb_entry)
-		return NULL;
-
-	VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
-	vma = find_vma(walk->mm, addr);
-	if (vma && vma->vm_start <= addr && is_vm_hugetlb_page(vma))
-		return vma;
-
-	return NULL;
-}
-
 #else /* CONFIG_HUGETLB_PAGE */
-static struct vm_area_struct* hugetlb_vma(unsigned long addr, struct mm_walk *walk)
-{
-	return NULL;
-}
-
 static int walk_hugetlb_range(struct vm_area_struct *vma,
 			      unsigned long addr, unsigned long end,
 			      struct mm_walk *walk)
@@ -198,30 +177,53 @@ int walk_page_range(unsigned long addr, unsigned long end,
 	if (!walk->mm)
 		return -EINVAL;
 
+	VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
+
 	pgd = pgd_offset(walk->mm, addr);
 	do {
-		struct vm_area_struct *vma;
+		struct vm_area_struct *vma = NULL;
 
 		next = pgd_addr_end(addr, end);
 
 		/*
-		 * handle hugetlb vma individually because pagetable walk for
-		 * the hugetlb page is dependent on the architecture and
-		 * we can't handled it in the same manner as non-huge pages.
+		 * This function was not intended to be vma based.
+		 * But there are vma special cases to be handled:
+		 * - hugetlb vma's
+		 * - VM_PFNMAP vma's
 		 */
-		vma = hugetlb_vma(addr, walk);
+		vma = find_vma(walk->mm, addr);
 		if (vma) {
-			if (vma->vm_end < next)
+			/*
+			 * There are no page structures backing a VM_PFNMAP
+			 * range, so do not allow split_huge_page_pmd().
+			 */
+			if ((vma->vm_start <= addr) &&
+			    (vma->vm_flags & VM_PFNMAP)) {
 				next = vma->vm_end;
+				pgd = pgd_offset(walk->mm, next);
+				continue;
+			}
 			/*
-			 * Hugepage is very tightly coupled with vma, so
-			 * walk through hugetlb entries within a given vma.
+			 * Handle hugetlb vma individually because pagetable
+			 * walk for the hugetlb page is dependent on the
+			 * architecture and we can't handled it in the same
+			 * manner as non-huge pages.
 			 */
-			err = walk_hugetlb_range(vma, addr, next, walk);
-			if (err)
-				break;
-			pgd = pgd_offset(walk->mm, next);
-			continue;
+			if (walk->hugetlb_entry && (vma->vm_start <= addr) &&
+			    is_vm_hugetlb_page(vma)) {
+				if (vma->vm_end < next)
+					next = vma->vm_end;
+				/*
+				 * Hugepage is very tightly coupled with vma,
+				 * so walk through hugetlb entries within a
+				 * given vma.
+				 */
+				err = walk_hugetlb_range(vma, addr, next, walk);
+				if (err)
+					break;
+				pgd = pgd_offset(walk->mm, next);
+				continue;
+			}
 		}
 
 		if (pgd_none_or_clear_bad(pgd)) {