diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 8456397f5f4d614e3df04dc728c2ae79f08f6675..59822dee438adfe53f373569f9b74d675726b56d 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -165,7 +165,7 @@ static void __init kmap_init(void)
 	kmap_prot = PAGE_KERNEL;
 }
 
-static void init_highmem(void)
+static void __init init_highmem(void)
 {
 	pgd_t *pgd;
 	pud_t *pud;
diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c
index 9657c89fdf31cd5d9024b8786053def3814315ce..bd3da8a61f645810bc7af9ec42a6db240379b778 100644
--- a/arch/um/sys-i386/ptrace.c
+++ b/arch/um/sys-i386/ptrace.c
@@ -155,7 +155,7 @@ int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
 	if (err)
 		return err;
 
-	n = copy_to_user((void *) buf, fpregs, sizeof(fpregs));
+	n = copy_to_user(buf, fpregs, sizeof(fpregs));
 	if(n > 0)
 		return -EFAULT;
 
@@ -168,7 +168,7 @@ int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
 	long fpregs[HOST_FP_SIZE];
 
 	BUG_ON(sizeof(*buf) != sizeof(fpregs));
-	n = copy_from_user(fpregs, (void *) buf, sizeof(fpregs));
+	n = copy_from_user(fpregs, buf, sizeof(fpregs));
 	if (n > 0)
 		return -EFAULT;
 
@@ -185,7 +185,7 @@ int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
 	if (err)
 		return err;
 
-	n = copy_to_user((void *) buf, fpregs, sizeof(fpregs));
+	n = copy_to_user(buf, fpregs, sizeof(fpregs));
 	if(n > 0)
 		return -EFAULT;
 
@@ -198,7 +198,7 @@ int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
 	long fpregs[HOST_XFP_SIZE];
 
 	BUG_ON(sizeof(*buf) != sizeof(fpregs));
-	n = copy_from_user(fpregs, (void *) buf, sizeof(fpregs));
+	n = copy_from_user(fpregs, buf, sizeof(fpregs));
 	if (n > 0)
 		return -EFAULT;
 
diff --git a/arch/um/sys-x86_64/ptrace.c b/arch/um/sys-x86_64/ptrace.c
index a3cfeed17af42138e475b112208e72a462be9c98..b7631b0e9ddc212a12966652925646e996768188 100644
--- a/arch/um/sys-x86_64/ptrace.c
+++ b/arch/um/sys-x86_64/ptrace.c
@@ -154,7 +154,7 @@ int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
 	if (err)
 		return err;
 
-	n = copy_to_user((void *) buf, fpregs, sizeof(fpregs));
+	n = copy_to_user(buf, fpregs, sizeof(fpregs));
 	if(n > 0)
 		return -EFAULT;
 
@@ -167,7 +167,7 @@ int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
 	long fpregs[HOST_FP_SIZE];
 
 	BUG_ON(sizeof(*buf) != sizeof(fpregs));
-	n = copy_from_user(fpregs, (void *) buf, sizeof(fpregs));
+	n = copy_from_user(fpregs, buf, sizeof(fpregs));
 	if (n > 0)
 		return -EFAULT;