Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:

 - "fork: unconditionally clear stack on fork" is a non-bugfix which got
   lost during the merge window - performance concerns appear to have
   been adequately addressed.

 - and a bunch of fixes

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm/filemap.c: fix NULL pointer in page_cache_tree_insert()
  mm: memcg: add __GFP_NOWARN in __memcg_schedule_kmem_cache_create()
  fs, elf: don't complain MAP_FIXED_NOREPLACE unless -EEXIST error
  kexec_file: do not add extra alignment to efi memmap
  proc: fix /proc/loadavg regression
  proc: revalidate kernel thread inodes to root:root
  autofs: mount point create should honour passed in mode
  MAINTAINERS: add personal addresses for Sascha and Uwe
  kasan: add no_sanitize attribute for clang builds
  rapidio: fix rio_dma_transfer error handling
  mm: enable thp migration for shmem thp
  writeback: safer lock nesting
  mm, pagemap: fix swap offset value for PMD migration entry
  mm: fix do_pages_move status handling
  fork: unconditionally clear stack on fork

MAINTAINERS

@@ -1373,7 +1373,8 @@ F:	arch/arm/mach-ebsa110/
 F:	drivers/net/ethernet/amd/am79c961a.*
 
 ARM/ENERGY MICRO (SILICON LABS) EFM32 SUPPORT
-M:	Uwe Kleine-König <kernel@pengutronix.de>
+M:	Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
+R:	Pengutronix Kernel Team <kernel@pengutronix.de>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 N:	efm32
@@ -1401,7 +1402,8 @@ F:	arch/arm/mach-footbridge/
 
 ARM/FREESCALE IMX / MXC ARM ARCHITECTURE
 M:	Shawn Guo <shawnguo@kernel.org>
-M:	Sascha Hauer <kernel@pengutronix.de>
+M:	Sascha Hauer <s.hauer@pengutronix.de>
+R:	Pengutronix Kernel Team <kernel@pengutronix.de>
 R:	Fabio Estevam <fabio.estevam@nxp.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
@@ -1416,7 +1418,8 @@ F:	include/soc/imx/
 
 ARM/FREESCALE VYBRID ARM ARCHITECTURE
 M:	Shawn Guo <shawnguo@kernel.org>
-M:	Sascha Hauer <kernel@pengutronix.de>
+M:	Sascha Hauer <s.hauer@pengutronix.de>
+R:	Pengutronix Kernel Team <kernel@pengutronix.de>
 R:	Stefan Agner <stefan@agner.ch>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
@@ -5652,7 +5655,8 @@ F:	drivers/net/ethernet/freescale/fec.h
 F:	Documentation/devicetree/bindings/net/fsl-fec.txt
 
 FREESCALE IMX / MXC FRAMEBUFFER DRIVER
-M:	Sascha Hauer <kernel@pengutronix.de>
+M:	Sascha Hauer <s.hauer@pengutronix.de>
+R:	Pengutronix Kernel Team <kernel@pengutronix.de>
 L:	linux-fbdev@vger.kernel.org
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
@@ -12825,7 +12829,8 @@ F:	include/linux/siphash.h
 
 SIOX
 M:	Gavin Schenk <g.schenk@eckelmann.de>
-M:	Uwe Kleine-König <kernel@pengutronix.de>
+M:	Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
+R:	Pengutronix Kernel Team <kernel@pengutronix.de>
 S:	Supported
 F:	drivers/siox/*
 F:	include/trace/events/siox.h

arch/powerpc/platforms/cell/spufs/sched.c

@@ -1093,7 +1093,7 @@ static int show_spu_loadavg(struct seq_file *s, void *private)
 		LOAD_INT(c), LOAD_FRAC(c),
 		count_active_contexts(),
 		atomic_read(&nr_spu_contexts),
-		idr_get_cursor(&task_active_pid_ns(current)->idr));
+		idr_get_cursor(&task_active_pid_ns(current)->idr) - 1);
 	return 0;
 }
 

arch/x86/kernel/kexec-bzimage64.c

@@ -398,11 +398,10 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 	 * little bit simple
 	 */
 	efi_map_sz = efi_get_runtime_map_size();
-	efi_map_sz = ALIGN(efi_map_sz, 16);
 	params_cmdline_sz = sizeof(struct boot_params) + cmdline_len +
 				MAX_ELFCOREHDR_STR_LEN;
 	params_cmdline_sz = ALIGN(params_cmdline_sz, 16);
-	kbuf.bufsz = params_cmdline_sz + efi_map_sz +
+	kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) +
 				sizeof(struct setup_data) +
 				sizeof(struct efi_setup_data);
 
@@ -410,7 +409,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 	if (!params)
 		return ERR_PTR(-ENOMEM);
 	efi_map_offset = params_cmdline_sz;
-	efi_setup_data_offset = efi_map_offset + efi_map_sz;
+	efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16);
 
 	/* Copy setup header onto bootparams. Documentation/x86/boot.txt */
 	setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset;

drivers/rapidio/devices/rio_mport_cdev.c

@@ -740,10 +740,7 @@ static int do_dma_request(struct mport_dma_req *req,
 	tx->callback = dma_xfer_callback;
 	tx->callback_param = req;
 
-	req->dmach = chan;
-	req->sync = sync;
 	req->status = DMA_IN_PROGRESS;
-	init_completion(&req->req_comp);
 	kref_get(&req->refcount);
 
 	cookie = dmaengine_submit(tx);
@@ -831,13 +828,20 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode,
 	if (!req)
 		return -ENOMEM;
 
-	kref_init(&req->refcount);
-
 	ret = get_dma_channel(priv);
 	if (ret) {
 		kfree(req);
 		return ret;
 	}
+	chan = priv->dmach;
+
+	kref_init(&req->refcount);
+	init_completion(&req->req_comp);
+	req->dir = dir;
+	req->filp = filp;
+	req->priv = priv;
+	req->dmach = chan;
+	req->sync = sync;
 
 	/*
 	 * If parameter loc_addr != NULL, we are transferring data from/to
@@ -925,11 +929,6 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode,
 				xfer->offset, xfer->length);
 	}
 
-	req->dir = dir;
-	req->filp = filp;
-	req->priv = priv;
-	chan = priv->dmach;
-
 	nents = dma_map_sg(chan->device->dev,
 			   req->sgt.sgl, req->sgt.nents, dir);
 	if (nents == 0) {

fs/autofs4/root.c

@@ -749,7 +749,7 @@ static int autofs4_dir_mkdir(struct inode *dir,
 
 	autofs4_del_active(dentry);
 
-	inode = autofs4_get_inode(dir->i_sb, S_IFDIR | 0555);
+	inode = autofs4_get_inode(dir->i_sb, S_IFDIR | mode);
 	if (!inode)
 		return -ENOMEM;
 	d_add(dentry, inode);

fs/binfmt_elf.c

@@ -377,10 +377,10 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
 	} else
 		map_addr = vm_mmap(filep, addr, size, prot, type, off);
 
-	if ((type & MAP_FIXED_NOREPLACE) && BAD_ADDR(map_addr))
-		pr_info("%d (%s): Uhuuh, elf segment at %p requested but the memory is mapped already\n",
-				task_pid_nr(current), current->comm,
-				(void *)addr);
+	if ((type & MAP_FIXED_NOREPLACE) &&
+	    PTR_ERR((void *)map_addr) == -EEXIST)
+		pr_info("%d (%s): Uhuuh, elf segment at %px requested but the memory is mapped already\n",
+			task_pid_nr(current), current->comm, (void *)addr);
 
 	return(map_addr);
 }

fs/fs-writeback.c

@@ -745,11 +745,12 @@ int inode_congested(struct inode *inode, int cong_bits)
 	 */
 	if (inode && inode_to_wb_is_valid(inode)) {
 		struct bdi_writeback *wb;
-		bool locked, congested;
+		struct wb_lock_cookie lock_cookie = {};
+		bool congested;
 
-		wb = unlocked_inode_to_wb_begin(inode, &locked);
+		wb = unlocked_inode_to_wb_begin(inode, &lock_cookie);
 		congested = wb_congested(wb, cong_bits);
-		unlocked_inode_to_wb_end(inode, locked);
+		unlocked_inode_to_wb_end(inode, &lock_cookie);
 		return congested;
 	}
 

fs/proc/base.c

@@ -1693,6 +1693,12 @@ void task_dump_owner(struct task_struct *task, umode_t mode,
 	kuid_t uid;
 	kgid_t gid;
 
+	if (unlikely(task->flags & PF_KTHREAD)) {
+		*ruid = GLOBAL_ROOT_UID;
+		*rgid = GLOBAL_ROOT_GID;
+		return;
+	}
+
 	/* Default to the tasks effective ownership */
 	rcu_read_lock();
 	cred = __task_cred(task);

fs/proc/loadavg.c

@@ -24,7 +24,7 @@ static int loadavg_proc_show(struct seq_file *m, void *v)
 		LOAD_INT(avnrun[1]), LOAD_FRAC(avnrun[1]),
 		LOAD_INT(avnrun[2]), LOAD_FRAC(avnrun[2]),
 		nr_running(), nr_threads,
-		idr_get_cursor(&task_active_pid_ns(current)->idr));
+		idr_get_cursor(&task_active_pid_ns(current)->idr) - 1);
 	return 0;
 }
 

fs/proc/task_mmu.c

@@ -1310,9 +1310,11 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
 		else if (is_swap_pmd(pmd)) {
 			swp_entry_t entry = pmd_to_swp_entry(pmd);
+			unsigned long offset = swp_offset(entry);
 
+			offset += (addr & ~PMD_MASK) >> PAGE_SHIFT;
 			frame = swp_type(entry) |
-				(swp_offset(entry) << MAX_SWAPFILES_SHIFT);
+				(offset << MAX_SWAPFILES_SHIFT);
 			flags |= PM_SWAP;
 			if (pmd_swp_soft_dirty(pmd))
 				flags |= PM_SOFT_DIRTY;
@@ -1332,6 +1334,8 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
 				break;
 			if (pm->show_pfn && (flags & PM_PRESENT))
 				frame++;
+			else if (flags & PM_SWAP)
+				frame += (1 << MAX_SWAPFILES_SHIFT);
 		}
 		spin_unlock(ptl);
 		return err;

include/linux/backing-dev-defs.h

@@ -223,6 +223,11 @@ static inline void set_bdi_congested(struct backing_dev_info *bdi, int sync)
 	set_wb_congested(bdi->wb.congested, sync);
 }
 
+struct wb_lock_cookie {
+	bool locked;
+	unsigned long flags;
+};
+
 #ifdef CONFIG_CGROUP_WRITEBACK
 
 /**

include/linux/backing-dev.h

@@ -347,7 +347,7 @@ static inline struct bdi_writeback *inode_to_wb(const struct inode *inode)
 /**
  * unlocked_inode_to_wb_begin - begin unlocked inode wb access transaction
  * @inode: target inode
- * @lockedp: temp bool output param, to be passed to the end function
+ * @cookie: output param, to be passed to the end function
  *
  * The caller wants to access the wb associated with @inode but isn't
  * holding inode->i_lock, the i_pages lock or wb->list_lock.  This
@@ -355,12 +355,12 @@ static inline struct bdi_writeback *inode_to_wb(const struct inode *inode)
  * association doesn't change until the transaction is finished with
  * unlocked_inode_to_wb_end().
  *
- * The caller must call unlocked_inode_to_wb_end() with *@lockdep
- * afterwards and can't sleep during transaction.  IRQ may or may not be
- * disabled on return.
+ * The caller must call unlocked_inode_to_wb_end() with *@cookie afterwards and
+ * can't sleep during the transaction.  IRQs may or may not be disabled on
+ * return.
  */
 static inline struct bdi_writeback *
-unlocked_inode_to_wb_begin(struct inode *inode, bool *lockedp)
+unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie)
 {
 	rcu_read_lock();
 
@@ -368,10 +368,10 @@ unlocked_inode_to_wb_begin(struct inode *inode, bool *lockedp)
 	 * Paired with store_release in inode_switch_wb_work_fn() and
 	 * ensures that we see the new wb if we see cleared I_WB_SWITCH.
 	 */
-	*lockedp = smp_load_acquire(&inode->i_state) & I_WB_SWITCH;
+	cookie->locked = smp_load_acquire(&inode->i_state) & I_WB_SWITCH;
 
-	if (unlikely(*lockedp))
-		xa_lock_irq(&inode->i_mapping->i_pages);
+	if (unlikely(cookie->locked))
+		xa_lock_irqsave(&inode->i_mapping->i_pages, cookie->flags);
 
 	/*
 	 * Protected by either !I_WB_SWITCH + rcu_read_lock() or the i_pages
@@ -383,12 +383,13 @@ unlocked_inode_to_wb_begin(struct inode *inode, bool *lockedp)
 /**
  * unlocked_inode_to_wb_end - end inode wb access transaction
  * @inode: target inode
- * @locked: *@lockedp from unlocked_inode_to_wb_begin()
+ * @cookie: @cookie from unlocked_inode_to_wb_begin()
  */
-static inline void unlocked_inode_to_wb_end(struct inode *inode, bool locked)
+static inline void unlocked_inode_to_wb_end(struct inode *inode,
+					    struct wb_lock_cookie *cookie)
 {
-	if (unlikely(locked))
-		xa_unlock_irq(&inode->i_mapping->i_pages);
+	if (unlikely(cookie->locked))
+		xa_unlock_irqrestore(&inode->i_mapping->i_pages, cookie->flags);
 
 	rcu_read_unlock();
 }
@@ -435,12 +436,13 @@ static inline struct bdi_writeback *inode_to_wb(struct inode *inode)
 }
 
 static inline struct bdi_writeback *
-unlocked_inode_to_wb_begin(struct inode *inode, bool *lockedp)
+unlocked_inode_to_wb_begin(struct inode *inode, struct wb_lock_cookie *cookie)
 {
 	return inode_to_wb(inode);
 }
 
-static inline void unlocked_inode_to_wb_end(struct inode *inode, bool locked)
+static inline void unlocked_inode_to_wb_end(struct inode *inode,
+					    struct wb_lock_cookie *cookie)
 {
 }
 

include/linux/compiler-clang.h

@@ -25,6 +25,9 @@
 #define __SANITIZE_ADDRESS__
 #endif
 
+#undef __no_sanitize_address
+#define __no_sanitize_address __attribute__((no_sanitize("address")))
+
 /* Clang doesn't have a way to turn it off per-function, yet. */
 #ifdef __noretpoline
 #undef __noretpoline

include/linux/thread_info.h

@@ -43,11 +43,7 @@ enum {
 #define THREAD_ALIGN	THREAD_SIZE
 #endif
 
-#if IS_ENABLED(CONFIG_DEBUG_STACK_USAGE) || IS_ENABLED(CONFIG_DEBUG_KMEMLEAK)
-# define THREADINFO_GFP		(GFP_KERNEL_ACCOUNT | __GFP_ZERO)
-#else
-# define THREADINFO_GFP		(GFP_KERNEL_ACCOUNT)
-#endif
+#define THREADINFO_GFP		(GFP_KERNEL_ACCOUNT | __GFP_ZERO)
 
 /*
  * flag set/clear/test wrappers

kernel/fork.c

@@ -216,10 +216,9 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
 		if (!s)
 			continue;
 
-#ifdef CONFIG_DEBUG_KMEMLEAK
 		/* Clear stale pointers from reused stack. */
 		memset(s->addr, 0, THREAD_SIZE);
-#endif
+
 		tsk->stack_vm_area = s;
 		return s->addr;
 	}

mm/filemap.c

@@ -786,7 +786,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
 	VM_BUG_ON_PAGE(!PageLocked(new), new);
 	VM_BUG_ON_PAGE(new->mapping, new);
 
-	error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM);
+	error = radix_tree_preload(gfp_mask & GFP_RECLAIM_MASK);
 	if (!error) {
 		struct address_space *mapping = old->mapping;
 		void (*freepage)(struct page *);
@@ -842,7 +842,7 @@ static int __add_to_page_cache_locked(struct page *page,
 			return error;
 	}
 
-	error = radix_tree_maybe_preload(gfp_mask & ~__GFP_HIGHMEM);
+	error = radix_tree_maybe_preload(gfp_mask & GFP_RECLAIM_MASK);
 	if (error) {
 		if (!huge)
 			mem_cgroup_cancel_charge(page, memcg, false);
@@ -1585,8 +1585,7 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t offset,
 		if (fgp_flags & FGP_ACCESSED)
 			__SetPageReferenced(page);
 
-		err = add_to_page_cache_lru(page, mapping, offset,
-				gfp_mask & GFP_RECLAIM_MASK);
+		err = add_to_page_cache_lru(page, mapping, offset, gfp_mask);
 		if (unlikely(err)) {
 			put_page(page);
 			page = NULL;
@@ -2387,7 +2386,7 @@ static int page_cache_read(struct file *file, pgoff_t offset, gfp_t gfp_mask)
 		if (!page)
 			return -ENOMEM;
 
-		ret = add_to_page_cache_lru(page, mapping, offset, gfp_mask & GFP_KERNEL);
+		ret = add_to_page_cache_lru(page, mapping, offset, gfp_mask);
 		if (ret == 0)
 			ret = mapping->a_ops->readpage(file, page);
 		else if (ret == -EEXIST)

mm/huge_memory.c

@@ -2925,7 +2925,10 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
 		pmde = maybe_pmd_mkwrite(pmde, vma);
 
 	flush_cache_range(vma, mmun_start, mmun_start + HPAGE_PMD_SIZE);
-	page_add_anon_rmap(new, vma, mmun_start, true);
+	if (PageAnon(new))
+		page_add_anon_rmap(new, vma, mmun_start, true);
+	else
+		page_add_file_rmap(new, true);
 	set_pmd_at(mm, mmun_start, pvmw->pmd, pmde);
 	if (vma->vm_flags & VM_LOCKED)
 		mlock_vma_page(new);

mm/memcontrol.c

@@ -2192,7 +2192,7 @@ static void __memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg,
 {
 	struct memcg_kmem_cache_create_work *cw;
 
-	cw = kmalloc(sizeof(*cw), GFP_NOWAIT);
+	cw = kmalloc(sizeof(*cw), GFP_NOWAIT | __GFP_NOWARN);
 	if (!cw)
 		return;
 

mm/migrate.c

@@ -472,7 +472,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
 	pslot = radix_tree_lookup_slot(&mapping->i_pages,
  					page_index(page));
 
-	expected_count += 1 + page_has_private(page);
+	expected_count += hpage_nr_pages(page) + page_has_private(page);
 	if (page_count(page) != expected_count ||
 		radix_tree_deref_slot_protected(pslot,
 					&mapping->i_pages.xa_lock) != page) {
@@ -505,7 +505,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
 	 */
 	newpage->index = page->index;
 	newpage->mapping = page->mapping;
-	get_page(newpage);	/* add cache reference */
+	page_ref_add(newpage, hpage_nr_pages(page)); /* add cache reference */
 	if (PageSwapBacked(page)) {
 		__SetPageSwapBacked(newpage);
 		if (PageSwapCache(page)) {
@@ -524,13 +524,26 @@ int migrate_page_move_mapping(struct address_space *mapping,
 	}
 
 	radix_tree_replace_slot(&mapping->i_pages, pslot, newpage);
+	if (PageTransHuge(page)) {
+		int i;
+		int index = page_index(page);
+
+		for (i = 0; i < HPAGE_PMD_NR; i++) {
+			pslot = radix_tree_lookup_slot(&mapping->i_pages,
+						       index + i);
+			radix_tree_replace_slot(&mapping->i_pages, pslot,
+						newpage + i);
+		}
+	} else {
+		radix_tree_replace_slot(&mapping->i_pages, pslot, newpage);
+	}
 
 	/*
 	 * Drop cache reference from old page by unfreezing
 	 * to one less reference.
 	 * We know this isn't the last reference.
 	 */
-	page_ref_unfreeze(page, expected_count - 1);
+	page_ref_unfreeze(page, expected_count - hpage_nr_pages(page));
 
 	xa_unlock(&mapping->i_pages);
 	/* Leave irq disabled to prevent preemption while updating stats */
@@ -1622,6 +1635,9 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
 		current_node = NUMA_NO_NODE;
 	}
 out_flush:
+	if (list_empty(&pagelist))
+		return err;
+
 	/* Make sure we do not overwrite the existing error */
 	err1 = do_move_pages_to_node(mm, &pagelist, current_node);
 	if (!err1)

mm/page-writeback.c

@@ -2502,13 +2502,13 @@ void account_page_redirty(struct page *page)
 	if (mapping && mapping_cap_account_dirty(mapping)) {
 		struct inode *inode = mapping->host;
 		struct bdi_writeback *wb;
-		bool locked;
+		struct wb_lock_cookie cookie = {};
 
-		wb = unlocked_inode_to_wb_begin(inode, &locked);
+		wb = unlocked_inode_to_wb_begin(inode, &cookie);
 		current->nr_dirtied--;
 		dec_node_page_state(page, NR_DIRTIED);
 		dec_wb_stat(wb, WB_DIRTIED);
-		unlocked_inode_to_wb_end(inode, locked);
+		unlocked_inode_to_wb_end(inode, &cookie);
 	}
 }
 EXPORT_SYMBOL(account_page_redirty);
@@ -2614,15 +2614,15 @@ void __cancel_dirty_page(struct page *page)
 	if (mapping_cap_account_dirty(mapping)) {
 		struct inode *inode = mapping->host;
 		struct bdi_writeback *wb;
-		bool locked;
+		struct wb_lock_cookie cookie = {};
 
 		lock_page_memcg(page);
-		wb = unlocked_inode_to_wb_begin(inode, &locked);
+		wb = unlocked_inode_to_wb_begin(inode, &cookie);
 
 		if (TestClearPageDirty(page))
 			account_page_cleaned(page, mapping, wb);
 
-		unlocked_inode_to_wb_end(inode, locked);
+		unlocked_inode_to_wb_end(inode, &cookie);
 		unlock_page_memcg(page);
 	} else {
 		ClearPageDirty(page);
@@ -2654,7 +2654,7 @@ int clear_page_dirty_for_io(struct page *page)
 	if (mapping && mapping_cap_account_dirty(mapping)) {
 		struct inode *inode = mapping->host;
 		struct bdi_writeback *wb;
-		bool locked;
+		struct wb_lock_cookie cookie = {};
 
 		/*
 		 * Yes, Virginia, this is indeed insane.
@@ -2691,14 +2691,14 @@ int clear_page_dirty_for_io(struct page *page)
 		 * always locked coming in here, so we get the desired
 		 * exclusion.
 		 */
-		wb = unlocked_inode_to_wb_begin(inode, &locked);
+		wb = unlocked_inode_to_wb_begin(inode, &cookie);
 		if (TestClearPageDirty(page)) {
 			dec_lruvec_page_state(page, NR_FILE_DIRTY);
 			dec_zone_page_state(page, NR_ZONE_WRITE_PENDING);
 			dec_wb_stat(wb, WB_RECLAIMABLE);
 			ret = 1;
 		}
-		unlocked_inode_to_wb_end(inode, locked);
+		unlocked_inode_to_wb_end(inode, &cookie);
 		return ret;
 	}
 	return TestClearPageDirty(page);

mm/rmap.c

@@ -1374,9 +1374,6 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 		if (!pvmw.pte && (flags & TTU_MIGRATION)) {
 			VM_BUG_ON_PAGE(PageHuge(page) || !PageTransCompound(page), page);
 
-			if (!PageAnon(page))
-				continue;
-
 			set_pmd_migration_entry(&pvmw, page);
 			continue;
 		}