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Commit c67e5382 authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Linus Torvalds
Browse files

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: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 243f3803

init/do_mounts.c

+12 −2
Original line number Diff line number Diff line 
/*

 * 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(".");

}

init/do_mounts_initrd.c

+10 −0
Original line number Diff line number Diff line 
/*

 * 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>

init/do_mounts_md.c

+11 −1
Original line number Diff line number Diff line 
/*

 * 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);

init/do_mounts_rd.c

+11 −2
Original line number Diff line number Diff line 
/*

 * 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;

}

init/initramfs.c

+13 −3
Original line number Diff line number Diff line 
/*

 * 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,