diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index d842ac4..6053f47 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -933,8 +933,8 @@
 static int erst_close_pstore(struct pstore_info *psi);
 static ssize_t erst_reader(u64 *id, enum pstore_type_id *type,
 			   struct timespec *time, struct pstore_info *psi);
-static u64 erst_writer(enum pstore_type_id type, int part, size_t size,
-		       struct pstore_info *psi);
+static u64 erst_writer(enum pstore_type_id type, unsigned int part,
+		       size_t size, struct pstore_info *psi);
 static int erst_clearer(enum pstore_type_id type, u64 id,
 			struct pstore_info *psi);
 
@@ -1040,8 +1040,8 @@
 	return (rc < 0) ? rc : (len - sizeof(*rcd));
 }
 
-static u64 erst_writer(enum pstore_type_id type, int part, size_t size,
-		       struct pstore_info *psi)
+static u64 erst_writer(enum pstore_type_id type, unsigned int part,
+		       size_t size, struct pstore_info *psi)
 {
 	struct cper_pstore_record *rcd = (struct cper_pstore_record *)
 					(erst_info.buf - sizeof(*rcd));
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 163bb40..49ff1de 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -67,7 +67,8 @@
 	unsigned long	size, total = 0;
 	char		*dst, *why;
 	u64		id;
-	int		hsize, part = 1;
+	int		hsize;
+	unsigned int	part = 1;
 
 	if (reason < ARRAY_SIZE(reason_str))
 		why = reason_str[reason];
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index 12be8f1..cc03bbf 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -39,7 +39,7 @@
 	int		(*close)(struct pstore_info *psi);
 	ssize_t		(*read)(u64 *id, enum pstore_type_id *type,
 			struct timespec *time, struct pstore_info *psi);
-	u64		(*write)(enum pstore_type_id type, int part,
+	u64		(*write)(enum pstore_type_id type, unsigned int part,
 			size_t size, struct pstore_info *psi);
 	int		(*erase)(enum pstore_type_id type, u64 id,
 			struct pstore_info *psi);