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Date: Fri, 20 Apr 2012 18:05:33 -0700
From: H Hartley Sweeten <hartleys@...ionengravers.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>
CC: <akpm@...ux-foundation.org>
Subject: [PATCH] init: disable sparse checking of the mount.o source files
The init/mount.o source files produce a number of sparse warnings
of the type:
warning: incorrect type in argument 1 (different address spaces)
expected char [noderef] <asn:1>*dev_name
got char *name
This is due to the syscalls expecting some of the arguments to be
user pointers but they are being passed as kernel pointers. This is
harmless but adds a lot of noise to a sparse build.
To limit the noise just disable the sparse checking in the relevant
source files, but still display a warning so that the user knows this
has been done.
Since the sparse checking has been disabled we can also remove
the __user __force casts that are scattered thru the source.
Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 0e93f92..8dfa0de 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -1,3 +1,13 @@
+/*
+ * Many of the syscalls used in this file expect some of the arguments
+ * to be __user pointers not __kernel pointers. To limit the sparse
+ * noise, turn off sparse checking for this file.
+ */
+#ifdef __CHECKER__
+#undef __CHECKER__
+#warning "Sparse checking disabled for this file"
+#endif
+
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/ctype.h>
@@ -330,7 +340,7 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
if (err)
return err;
- sys_chdir((const char __user __force *)"/root");
+ sys_chdir("/root");
s = current->fs->pwd.dentry->d_sb;
ROOT_DEV = s->s_dev;
printk(KERN_INFO
@@ -556,5 +566,5 @@ void __init prepare_namespace(void)
out:
devtmpfs_mount("dev");
sys_mount(".", "/", NULL, MS_MOVE, NULL);
- sys_chroot((const char __user __force *)".");
+ sys_chroot(".");
}
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 9047330..135959a2 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -1,3 +1,13 @@
+/*
+ * Many of the syscalls used in this file expect some of the arguments
+ * to be __user pointers not __kernel pointers. To limit the sparse
+ * noise, turn off sparse checking for this file.
+ */
+#ifdef __CHECKER__
+#undef __CHECKER__
+#warning "Sparse checking disabled for this file"
+#endif
+
#include <linux/unistd.h>
#include <linux/kernel.h>
#include <linux/fs.h>
diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c
index 32c4799..8cb6db5 100644
--- a/init/do_mounts_md.c
+++ b/init/do_mounts_md.c
@@ -1,3 +1,13 @@
+/*
+ * Many of the syscalls used in this file expect some of the arguments
+ * to be __user pointers not __kernel pointers. To limit the sparse
+ * noise, turn off sparse checking for this file.
+ */
+#ifdef __CHECKER__
+#undef __CHECKER__
+#warning "Sparse checking disabled for this file"
+#endif
+
#include <linux/delay.h>
#include <linux/raid/md_u.h>
#include <linux/raid/md_p.h>
@@ -283,7 +293,7 @@ static void __init autodetect_raid(void)
wait_for_device_probe();
- fd = sys_open((const char __user __force *) "/dev/md0", 0, 0);
+ fd = sys_open("/dev/md0", 0, 0);
if (fd >= 0) {
sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
sys_close(fd);
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index 6212586..6be2879 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -1,3 +1,12 @@
+/*
+ * Many of the syscalls used in this file expect some of the arguments
+ * to be __user pointers not __kernel pointers. To limit the sparse
+ * noise, turn off sparse checking for this file.
+ */
+#ifdef __CHECKER__
+#undef __CHECKER__
+#warning "Sparse checking disabled for this file"
+#endif
#include <linux/kernel.h>
#include <linux/fs.h>
@@ -181,7 +190,7 @@ int __init rd_load_image(char *from)
char rotator[4] = { '|' , '/' , '-' , '\\' };
#endif
- out_fd = sys_open((const char __user __force *) "/dev/ram", O_RDWR, 0);
+ out_fd = sys_open("/dev/ram", O_RDWR, 0);
if (out_fd < 0)
goto out;
@@ -280,7 +289,7 @@ noclose_input:
sys_close(out_fd);
out:
kfree(buf);
- sys_unlink((const char __user __force *) "/dev/ram");
+ sys_unlink("/dev/ram");
return res;
}
diff --git a/init/initramfs.c b/init/initramfs.c
index 8216c30..84c6bf1 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -1,3 +1,13 @@
+/*
+ * Many of the syscalls used in this file expect some of the arguments
+ * to be __user pointers not __kernel pointers. To limit the sparse
+ * noise, turn off sparse checking for this file.
+ */
+#ifdef __CHECKER__
+#undef __CHECKER__
+#warning "Sparse checking disabled for this file"
+#endif
+
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/slab.h>
@@ -74,7 +84,7 @@ static void __init free_hash(void)
}
}
-static long __init do_utime(char __user *filename, time_t mtime)
+static long __init do_utime(char *filename, time_t mtime)
{
struct timespec t[2];
@@ -529,7 +539,7 @@ static void __init clean_rootfs(void)
struct linux_dirent64 *dirp;
int num;
- fd = sys_open((const char __user __force *) "/", O_RDONLY, 0);
+ fd = sys_open("/", O_RDONLY, 0);
WARN_ON(fd < 0);
if (fd < 0)
return;
@@ -589,7 +599,7 @@ static int __init populate_rootfs(void)
}
printk(KERN_INFO "rootfs image is not initramfs (%s)"
"; looks like an initrd\n", err);
- fd = sys_open((const char __user __force *) "/initrd.image",
+ fd = sys_open("/initrd.image",
O_WRONLY|O_CREAT, 0700);
if (fd >= 0) {
sys_write(fd, (char *)initrd_start,
--
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