Merge branch 'akpm' (final batch from Andrew)

Merge third patch-bumb from Andrew Morton:
 "This wraps me up for -rc1.
   - Lots of misc stuff and things which were deferred/missed from
     patchbombings 1 & 2.
   - ocfs2 things
   - lib/scatterlist
   - hfsplus
   - fatfs
   - documentation
   - signals
   - procfs
   - lockdep
   - coredump
   - seqfile core
   - kexec
   - Tejun's large IDR tree reworkings
   - ipmi
   - partitions
   - nbd
   - random() things
   - kfifo
   - tools/testing/selftests updates
   - Sasha's large and pointless hlist cleanup"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (163 commits)
  hlist: drop the node parameter from iterators
  kcmp: make it depend on CHECKPOINT_RESTORE
  selftests: add a simple doc
  tools/testing/selftests/Makefile: rearrange targets
  selftests/efivarfs: add create-read test
  selftests/efivarfs: add empty file creation test
  selftests: add tests for efivarfs
  kfifo: fix kfifo_alloc() and kfifo_init()
  kfifo: move kfifo.c from kernel/ to lib/
  arch Kconfig: centralise CONFIG_ARCH_NO_VIRT_TO_BUS
  w1: add support for DS2413 Dual Channel Addressable Switch
  memstick: move the dereference below the NULL test
  drivers/pps/clients/pps-gpio.c: use devm_kzalloc
  Documentation/DMA-API-HOWTO.txt: fix typo
  include/linux/eventfd.h: fix incorrect filename is a comment
  mtd: mtd_stresstest: use prandom_bytes()
  mtd: mtd_subpagetest: convert to use prandom library
  mtd: mtd_speedtest: use prandom_bytes
  mtd: mtd_pagetest: convert to use prandom library
  mtd: mtd_oobtest: convert to use prandom library
  ...

7 files changed, 50 insertions, 85 deletions

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 394fea2ba1b..784b97cb05b 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -382,20 +382,21 @@ static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
 {
 	unsigned long flags;
-	int ret, id;
+	int id;
 	static int next_id;
 
-	do {
-		spin_lock_irqsave(&cm.lock, flags);
-		ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
-					next_id, &id);
-		if (!ret)
-			next_id = ((unsigned) id + 1) & MAX_IDR_MASK;
-		spin_unlock_irqrestore(&cm.lock, flags);
-	} while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
+	idr_preload(GFP_KERNEL);
+	spin_lock_irqsave(&cm.lock, flags);
+
+	id = idr_alloc(&cm.local_id_table, cm_id_priv, next_id, 0, GFP_NOWAIT);
+	if (id >= 0)
+		next_id = max(id + 1, 0);
+
+	spin_unlock_irqrestore(&cm.lock, flags);
+	idr_preload_end();
 
 	cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
-	return ret;
+	return id < 0 ? id : 0;
 }
 
 static void cm_free_id(__be32 local_id)
@@ -3844,7 +3845,6 @@ static int __init ib_cm_init(void)
 	cm.remote_sidr_table = RB_ROOT;
 	idr_init(&cm.local_id_table);
 	get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
-	idr_pre_get(&cm.local_id_table, GFP_KERNEL);
 	INIT_LIST_HEAD(&cm.timewait_list);
 
 	ret = class_register(&cm_class);
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index d789eea3216..71c2c711680 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2143,33 +2143,23 @@ static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
 			  unsigned short snum)
 {
 	struct rdma_bind_list *bind_list;
-	int port, ret;
+	int ret;
 
 	bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
 	if (!bind_list)
 		return -ENOMEM;
 
-	do {
-		ret = idr_get_new_above(ps, bind_list, snum, &port);
-	} while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
-
-	if (ret)
-		goto err1;
-
-	if (port != snum) {
-		ret = -EADDRNOTAVAIL;
-		goto err2;
-	}
+	ret = idr_alloc(ps, bind_list, snum, snum + 1, GFP_KERNEL);
+	if (ret < 0)
+		goto err;
 
 	bind_list->ps = ps;
-	bind_list->port = (unsigned short) port;
+	bind_list->port = (unsigned short)ret;
 	cma_bind_port(bind_list, id_priv);
 	return 0;
-err2:
-	idr_remove(ps, port);
-err1:
+err:
 	kfree(bind_list);
-	return ret;
+	return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
 }
 
 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
@@ -2214,10 +2204,9 @@ static int cma_check_port(struct rdma_bind_list *bind_list,
 {
 	struct rdma_id_private *cur_id;
 	struct sockaddr *addr, *cur_addr;
-	struct hlist_node *node;
 
 	addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
-	hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
+	hlist_for_each_entry(cur_id, &bind_list->owners, node) {
 		if (id_priv == cur_id)
 			continue;
 
diff --git a/drivers/infiniband/core/fmr_pool.c b/drivers/infiniband/core/fmr_pool.c
index 176c8f90f2b..9f5ad7cc33c 100644
--- a/drivers/infiniband/core/fmr_pool.c
+++ b/drivers/infiniband/core/fmr_pool.c
@@ -118,14 +118,13 @@ static inline struct ib_pool_fmr *ib_fmr_cache_lookup(struct ib_fmr_pool *pool,
 {
 	struct hlist_head *bucket;
 	struct ib_pool_fmr *fmr;
-	struct hlist_node *pos;
 
 	if (!pool->cache_bucket)
 		return NULL;
 
 	bucket = pool->cache_bucket + ib_fmr_hash(*page_list);
 
-	hlist_for_each_entry(fmr, pos, bucket, cache_node)
+	hlist_for_each_entry(fmr, bucket, cache_node)
 		if (io_virtual_address == fmr->io_virtual_address &&
 		    page_list_len      == fmr->page_list_len      &&
 		    !memcmp(page_list, fmr->page_list,
diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c
index a8905abc56e..934f45e79e5 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -611,19 +611,21 @@ static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
 
 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
 {
+	bool preload = gfp_mask & __GFP_WAIT;
 	unsigned long flags;
 	int ret, id;
 
-retry:
-	if (!idr_pre_get(&query_idr, gfp_mask))
-		return -ENOMEM;
+	if (preload)
+		idr_preload(gfp_mask);
 	spin_lock_irqsave(&idr_lock, flags);
-	ret = idr_get_new(&query_idr, query, &id);
+
+	id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
+
 	spin_unlock_irqrestore(&idr_lock, flags);
-	if (ret == -EAGAIN)
-		goto retry;
-	if (ret)
-		return ret;
+	if (preload)
+		idr_preload_end();
+	if (id < 0)
+		return id;
 
 	query->mad_buf->timeout_ms  = timeout_ms;
 	query->mad_buf->context[0] = query;
diff --git a/drivers/infiniband/core/ucm.c b/drivers/infiniband/core/ucm.c
index 49b15ac1987..f2f63933e8a 100644
--- a/drivers/infiniband/core/ucm.c
+++ b/drivers/infiniband/core/ucm.c
@@ -176,7 +176,6 @@ static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
 {
 	struct ib_ucm_context *ctx;
-	int result;
 
 	ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 	if (!ctx)
@@ -187,17 +186,10 @@ static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
 	ctx->file = file;
 	INIT_LIST_HEAD(&ctx->events);
 
-	do {
-		result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
-		if (!result)
-			goto error;
-
-		mutex_lock(&ctx_id_mutex);
-		result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
-		mutex_unlock(&ctx_id_mutex);
-	} while (result == -EAGAIN);
-
-	if (result)
+	mutex_lock(&ctx_id_mutex);
+	ctx->id = idr_alloc(&ctx_id_table, ctx, 0, 0, GFP_KERNEL);
+	mutex_unlock(&ctx_id_mutex);
+	if (ctx->id < 0)
 		goto error;
 
 	list_add_tail(&ctx->file_list, &file->ctxs);
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 2709ff58139..5ca44cd9b00 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -145,7 +145,6 @@ static void ucma_put_ctx(struct ucma_context *ctx)
 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
 {
 	struct ucma_context *ctx;
-	int ret;
 
 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
@@ -156,17 +155,10 @@ static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
 	INIT_LIST_HEAD(&ctx->mc_list);
 	ctx->file = file;
 
-	do {
-		ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
-		if (!ret)
-			goto error;
-
-		mutex_lock(&mut);
-		ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
-		mutex_unlock(&mut);
-	} while (ret == -EAGAIN);
-
-	if (ret)
+	mutex_lock(&mut);
+	ctx->id = idr_alloc(&ctx_idr, ctx, 0, 0, GFP_KERNEL);
+	mutex_unlock(&mut);
+	if (ctx->id < 0)
 		goto error;
 
 	list_add_tail(&ctx->list, &file->ctx_list);
@@ -180,23 +172,15 @@ error:
 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
 {
 	struct ucma_multicast *mc;
-	int ret;
 
 	mc = kzalloc(sizeof(*mc), GFP_KERNEL);
 	if (!mc)
 		return NULL;
 
-	do {
-		ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
-		if (!ret)
-			goto error;
-
-		mutex_lock(&mut);
-		ret = idr_get_new(&multicast_idr, mc, &mc->id);
-		mutex_unlock(&mut);
-	} while (ret == -EAGAIN);
-
-	if (ret)
+	mutex_lock(&mut);
+	mc->id = idr_alloc(&multicast_idr, mc, 0, 0, GFP_KERNEL);
+	mutex_unlock(&mut);
+	if (mc->id < 0)
 		goto error;
 
 	mc->ctx = ctx;
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index e71d834c922..a7d00f6b3bc 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -125,18 +125,17 @@ static int idr_add_uobj(struct idr *idr, struct ib_uobject *uobj)
 {
 	int ret;
 
-retry:
-	if (!idr_pre_get(idr, GFP_KERNEL))
-		return -ENOMEM;
-
+	idr_preload(GFP_KERNEL);
 	spin_lock(&ib_uverbs_idr_lock);
-	ret = idr_get_new(idr, uobj, &uobj->id);
-	spin_unlock(&ib_uverbs_idr_lock);
 
-	if (ret == -EAGAIN)
-		goto retry;
+	ret = idr_alloc(idr, uobj, 0, 0, GFP_NOWAIT);
+	if (ret >= 0)
+		uobj->id = ret;
 
-	return ret;
+	spin_unlock(&ib_uverbs_idr_lock);
+	idr_preload_end();
+
+	return ret < 0 ? ret : 0;
 }
 
 void idr_remove_uobj(struct idr *idr, struct ib_uobject *uobj)