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Message-Id: <20130228163111.5d61d391.akpm@linux-foundation.org>
Date: Thu, 28 Feb 2013 16:31:11 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Wolfram Sang <wsa@...-dreams.de>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] shmem: fix build regression
On Fri, 1 Mar 2013 00:17:39 +0100
Wolfram Sang <wsa@...-dreams.de> wrote:
> commit 6b4d0b27 (clean shmem_file_setup() a bit) broke allnoconfig since
> this needs the NOMMU path where 'error' is still needed:
>
> mm/shmem.c:2935:2: error: 'error' undeclared (first use in this function)
>
> Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> ---
> mm/shmem.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/mm/shmem.c b/mm/shmem.c
> index ed2befb..56ff7d7 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -2897,6 +2897,7 @@ static struct dentry_operations anon_ops = {
> */
> struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags)
> {
> + int error;
> struct file *res;
> struct inode *inode;
> struct path path;
That will generate an unused-var warning on CONFIG_MMU=y. We can
avoid that by doing
+ {
+ int error;
...
+ }
or by reusing an existing local.
How's this?
From: Andrew Morton <akpm@...ux-foundation.org>
Subject: shmem-fix-build-regression-fix
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
include/linux/ramfs.h | 8 +++++++-
mm/shmem.c | 12 ++++--------
2 files changed, 11 insertions(+), 9 deletions(-)
diff -puN mm/shmem.c~shmem-fix-build-regression-fix mm/shmem.c
--- a/mm/shmem.c~shmem-fix-build-regression-fix
+++ a/mm/shmem.c
@@ -25,6 +25,7 @@
#include <linux/init.h>
#include <linux/vfs.h>
#include <linux/mount.h>
+#include <linux/ramfs.h>
#include <linux/pagemap.h>
#include <linux/file.h>
#include <linux/mm.h>
@@ -2830,8 +2831,6 @@ out4:
* effectively equivalent, but much lighter weight.
*/
-#include <linux/ramfs.h>
-
static struct file_system_type shmem_fs_type = {
.name = "tmpfs",
.mount = ramfs_mount,
@@ -2897,7 +2896,6 @@ static struct dentry_operations anon_ops
*/
struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags)
{
- int error;
struct file *res;
struct inode *inode;
struct path path;
@@ -2932,12 +2930,10 @@ struct file *shmem_file_setup(const char
d_instantiate(path.dentry, inode);
inode->i_size = size;
clear_nlink(inode); /* It is unlinked */
-#ifndef CONFIG_MMU
- error = ramfs_nommu_expand_for_mapping(inode, size);
- res = ERR_PTR(error);
- if (error)
+
+ res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size));
+ if (IS_ERR(res))
goto put_dentry;
-#endif
res = alloc_file(&path, FMODE_WRITE | FMODE_READ,
&shmem_file_operations);
diff -puN include/linux/ramfs.h~shmem-fix-build-regression-fix include/linux/ramfs.h
--- a/include/linux/ramfs.h~shmem-fix-build-regression-fix
+++ a/include/linux/ramfs.h
@@ -6,7 +6,13 @@ struct inode *ramfs_get_inode(struct sup
extern struct dentry *ramfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data);
-#ifndef CONFIG_MMU
+#ifdef CONFIG_MMU
+static inline int
+ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
+{
+ return 0;
+}
+#else
extern int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize);
extern unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
unsigned long addr,
_
--
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