diff --git a/arch/s390/lib/test_unwind.c b/arch/s390/lib/test_unwind.c
index 32b7a30b2485..eb382ceaa116 100644
--- a/arch/s390/lib/test_unwind.c
+++ b/arch/s390/lib/test_unwind.c
@@ -9,6 +9,7 @@
 #include <linux/kallsyms.h>
 #include <linux/kthread.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/kprobes.h>
 #include <linux/wait.h>
diff --git a/drivers/dma/sf-pdma/sf-pdma.c b/drivers/dma/sf-pdma/sf-pdma.c
index 5c118c7e02bd..6e530dca6d9e 100644
--- a/drivers/dma/sf-pdma/sf-pdma.c
+++ b/drivers/dma/sf-pdma/sf-pdma.c
@@ -20,6 +20,7 @@
 #include <linux/mod_devicetable.h>
 #include <linux/dma-mapping.h>
 #include <linux/of.h>
+#include <linux/slab.h>
 
 #include "sf-pdma.h"
 
diff --git a/drivers/dma/st_fdma.c b/drivers/dma/st_fdma.c
index 67087dbe2f9f..962b6e05287b 100644
--- a/drivers/dma/st_fdma.c
+++ b/drivers/dma/st_fdma.c
@@ -15,6 +15,7 @@
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/remoteproc.h>
+#include <linux/slab.h>
 
 #include "st_fdma.h"
 
diff --git a/drivers/dma/uniphier-xdmac.c b/drivers/dma/uniphier-xdmac.c
index 7b2f8a8c2d31..16b19654873d 100644
--- a/drivers/dma/uniphier-xdmac.c
+++ b/drivers/dma/uniphier-xdmac.c
@@ -12,6 +12,7 @@
 #include <linux/of.h>
 #include <linux/of_dma.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 
 #include "dmaengine.h"
 #include "virt-dma.h"
diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
index aa91f69a5fa9..a5b8dab80c76 100644
--- a/drivers/misc/uacce/uacce.c
+++ b/drivers/misc/uacce/uacce.c
@@ -4,6 +4,7 @@
 #include <linux/iommu.h>
 #include <linux/module.h>
 #include <linux/poll.h>
+#include <linux/slab.h>
 #include <linux/uacce.h>
 
 static struct class *uacce_class;
diff --git a/drivers/mtd/mtdpstore.c b/drivers/mtd/mtdpstore.c
index a4fe6060b960..a3ae8778f6a9 100644
--- a/drivers/mtd/mtdpstore.c
+++ b/drivers/mtd/mtdpstore.c
@@ -7,6 +7,7 @@
 #include <linux/pstore_blk.h>
 #include <linux/mtd/mtd.h>
 #include <linux/bitops.h>
+#include <linux/slab.h>
 
 static struct mtdpstore_context {
 	int index;
diff --git a/drivers/mtd/nand/raw/cadence-nand-controller.c b/drivers/mtd/nand/raw/cadence-nand-controller.c
index c405722adfe1..c4f273e2fe78 100644
--- a/drivers/mtd/nand/raw/cadence-nand-controller.c
+++ b/drivers/mtd/nand/raw/cadence-nand-controller.c
@@ -17,6 +17,7 @@
 #include <linux/mtd/rawnand.h>
 #include <linux/of_device.h>
 #include <linux/iopoll.h>
+#include <linux/slab.h>
 
 /*
  * HPNFC can work in 3 modes:
diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index feb70283b6a2..903b2bb97e12 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -26,6 +26,7 @@
 #include <linux/reset.h>
 #include <linux/soc/qcom/mdt_loader.h>
 #include <linux/iopoll.h>
+#include <linux/slab.h>
 
 #include "remoteproc_internal.h"
 #include "qcom_common.h"
diff --git a/drivers/soc/qcom/pdr_interface.c b/drivers/soc/qcom/pdr_interface.c
index 4c9225f15c4e..088dc99f77f3 100644
--- a/drivers/soc/qcom/pdr_interface.c
+++ b/drivers/soc/qcom/pdr_interface.c
@@ -5,6 +5,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/workqueue.h>
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 611b3412fbfd..6dc03bab0c9d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2007 Oracle.  All rights reserved.
  */
 
+#include <crypto/hash.h>
 #include <linux/kernel.h>
 #include <linux/bio.h>
 #include <linux/buffer_head.h>
diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index ea868c6f9800..583820ec63e2 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -221,47 +221,17 @@ static __poll_t dlmfs_file_poll(struct file *file, poll_table *wait)
 	return event;
 }
 
-static ssize_t dlmfs_file_read(struct file *filp,
+static ssize_t dlmfs_file_read(struct file *file,
 			       char __user *buf,
 			       size_t count,
 			       loff_t *ppos)
 {
-	int bytes_left;
-	ssize_t got;
-	char *lvb_buf;
-	struct inode *inode = file_inode(filp);
+	char lvb[DLM_LVB_LEN];
 
-	mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
-		inode->i_ino, count, *ppos);
-
-	if (*ppos >= i_size_read(inode))
+	if (!user_dlm_read_lvb(file_inode(file), lvb))
 		return 0;
 
-	/* don't read past the lvb */
-	if (count > i_size_read(inode) - *ppos)
-		count = i_size_read(inode) - *ppos;
-
-	if (!count)
-		return 0;
-
-	lvb_buf = kmalloc(count, GFP_NOFS);
-	if (!lvb_buf)
-		return -ENOMEM;
-
-	got = user_dlm_read_lvb(inode, lvb_buf, count);
-	if (got) {
-		BUG_ON(got != count);
-		bytes_left = copy_to_user(buf, lvb_buf, count);
-		count -= bytes_left;
-	} else
-		count = 0;
-
-	kfree(lvb_buf);
-
-	*ppos = *ppos + count;
-
-	mlog(0, "read %zu bytes\n", count);
-	return count;
+	return simple_read_from_buffer(buf, count, ppos, lvb, sizeof(lvb));
 }
 
 static ssize_t dlmfs_file_write(struct file *filp,
@@ -269,34 +239,28 @@ static ssize_t dlmfs_file_write(struct file *filp,
 				size_t count,
 				loff_t *ppos)
 {
+	char lvb_buf[DLM_LVB_LEN];
 	int bytes_left;
-	char *lvb_buf;
 	struct inode *inode = file_inode(filp);
 
 	mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
 		inode->i_ino, count, *ppos);
 
-	if (*ppos >= i_size_read(inode))
+	if (*ppos >= DLM_LVB_LEN)
 		return -ENOSPC;
 
 	/* don't write past the lvb */
-	if (count > i_size_read(inode) - *ppos)
-		count = i_size_read(inode) - *ppos;
+	if (count > DLM_LVB_LEN - *ppos)
+		count = DLM_LVB_LEN - *ppos;
 
 	if (!count)
 		return 0;
 
-	lvb_buf = kmalloc(count, GFP_NOFS);
-	if (!lvb_buf)
-		return -ENOMEM;
-
 	bytes_left = copy_from_user(lvb_buf, buf, count);
 	count -= bytes_left;
 	if (count)
 		user_dlm_write_lvb(inode, lvb_buf, count);
 
-	kfree(lvb_buf);
-
 	*ppos = *ppos + count;
 	mlog(0, "wrote %zu bytes\n", count);
 	return count;
diff --git a/fs/ocfs2/dlmfs/userdlm.c b/fs/ocfs2/dlmfs/userdlm.c
index 3df5be25bfb1..339f098d9592 100644
--- a/fs/ocfs2/dlmfs/userdlm.c
+++ b/fs/ocfs2/dlmfs/userdlm.c
@@ -547,24 +547,20 @@ void user_dlm_write_lvb(struct inode *inode,
 	spin_unlock(&lockres->l_lock);
 }
 
-ssize_t user_dlm_read_lvb(struct inode *inode,
-			  char *val,
-			  unsigned int len)
+bool user_dlm_read_lvb(struct inode *inode, char *val)
 {
 	struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
 	char *lvb;
-	ssize_t ret = len;
-
-	BUG_ON(len > DLM_LVB_LEN);
+	bool ret = true;
 
 	spin_lock(&lockres->l_lock);
 
 	BUG_ON(lockres->l_level < DLM_LOCK_PR);
 	if (ocfs2_dlm_lvb_valid(&lockres->l_lksb)) {
 		lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
-		memcpy(val, lvb, len);
+		memcpy(val, lvb, DLM_LVB_LEN);
 	} else
-		ret = 0;
+		ret = false;
 
 	spin_unlock(&lockres->l_lock);
 	return ret;
diff --git a/fs/ocfs2/dlmfs/userdlm.h b/fs/ocfs2/dlmfs/userdlm.h
index 4bef7cdef859..0558ae768200 100644
--- a/fs/ocfs2/dlmfs/userdlm.h
+++ b/fs/ocfs2/dlmfs/userdlm.h
@@ -66,9 +66,7 @@ void user_dlm_cluster_unlock(struct user_lock_res *lockres,
 void user_dlm_write_lvb(struct inode *inode,
 			const char *val,
 			unsigned int len);
-ssize_t user_dlm_read_lvb(struct inode *inode,
-			  char *val,
-			  unsigned int len);
+bool user_dlm_read_lvb(struct inode *inode, char *val);
 struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
 void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
 void user_dlm_set_locking_protocol(void);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2df72def1f59..407881ebeab1 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1946,27 +1946,27 @@ struct super_operations {
 /*
  * Inode flags - they have no relation to superblock flags now
  */
-#define S_SYNC		1	/* Writes are synced at once */
-#define S_NOATIME	2	/* Do not update access times */
-#define S_APPEND	4	/* Append-only file */
-#define S_IMMUTABLE	8	/* Immutable file */
-#define S_DEAD		16	/* removed, but still open directory */
-#define S_NOQUOTA	32	/* Inode is not counted to quota */
-#define S_DIRSYNC	64	/* Directory modifications are synchronous */
-#define S_NOCMTIME	128	/* Do not update file c/mtime */
-#define S_SWAPFILE	256	/* Do not truncate: swapon got its bmaps */
-#define S_PRIVATE	512	/* Inode is fs-internal */
-#define S_IMA		1024	/* Inode has an associated IMA struct */
-#define S_AUTOMOUNT	2048	/* Automount/referral quasi-directory */
-#define S_NOSEC		4096	/* no suid or xattr security attributes */
+#define S_SYNC		(1 << 0)  /* Writes are synced at once */
+#define S_NOATIME	(1 << 1)  /* Do not update access times */
+#define S_APPEND	(1 << 2)  /* Append-only file */
+#define S_IMMUTABLE	(1 << 3)  /* Immutable file */
+#define S_DEAD		(1 << 4)  /* removed, but still open directory */
+#define S_NOQUOTA	(1 << 5)  /* Inode is not counted to quota */
+#define S_DIRSYNC	(1 << 6)  /* Directory modifications are synchronous */
+#define S_NOCMTIME	(1 << 7)  /* Do not update file c/mtime */
+#define S_SWAPFILE	(1 << 8)  /* Do not truncate: swapon got its bmaps */
+#define S_PRIVATE	(1 << 9)  /* Inode is fs-internal */
+#define S_IMA		(1 << 10) /* Inode has an associated IMA struct */
+#define S_AUTOMOUNT	(1 << 11) /* Automount/referral quasi-directory */
+#define S_NOSEC		(1 << 12) /* no suid or xattr security attributes */
 #ifdef CONFIG_FS_DAX
-#define S_DAX		8192	/* Direct Access, avoiding the page cache */
+#define S_DAX		(1 << 13) /* Direct Access, avoiding the page cache */
 #else
-#define S_DAX		0	/* Make all the DAX code disappear */
+#define S_DAX		0	  /* Make all the DAX code disappear */
 #endif
-#define S_ENCRYPTED	16384	/* Encrypted file (using fs/crypto/) */
-#define S_CASEFOLD	32768	/* Casefolded file */
-#define S_VERITY	65536	/* Verity file (using fs/verity/) */
+#define S_ENCRYPTED	(1 << 14) /* Encrypted file (using fs/crypto/) */
+#define S_CASEFOLD	(1 << 15) /* Casefolded file */
+#define S_VERITY	(1 << 16) /* Verity file (using fs/verity/) */
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 3ad65d4ce085..46881d902124 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -238,6 +238,7 @@
 			 SKB_DATA_ALIGN(sizeof(struct sk_buff)) +	\
 			 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 
+struct ahash_request;
 struct net_device;
 struct scatterlist;
 struct pipe_inode_info;
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 04d2bc97f497..e9cb30d8cbfb 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -10,6 +10,7 @@
 #include <linux/compiler.h>		/* __user			*/
 #include <uapi/linux/socket.h>
 
+struct file;
 struct pid;
 struct cred;
 struct socket;
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 9576fd8158d7..3835a8a8e9ea 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -7,7 +7,6 @@
 
 #include <linux/kernel.h>
 #include <linux/thread_info.h>
-#include <crypto/hash.h>
 #include <uapi/linux/uio.h>
 
 struct page;
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index bf538c2bec77..5e40786c8f12 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
+#include <crypto/hash.h>
 #include <linux/export.h>
 #include <linux/bvec.h>
 #include <linux/uio.h>
@@ -1567,7 +1568,7 @@ EXPORT_SYMBOL(csum_and_copy_to_iter);
 size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
 		struct iov_iter *i)
 {
-#ifdef CONFIG_CRYPTO
+#ifdef CONFIG_CRYPTO_HASH
 	struct ahash_request *hash = hashp;
 	struct scatterlist sg;
 	size_t copied;