Re: kernel panic using xfs as modules and gcc-2.96

[Keith Owens <kaos@xxxxxxxxxxxxxxxxx>]

On Sat, 16 Jun 2001 16:28:14 +0200, 
"Andreas Piesk" <a.piesk@xxxxxxx> wrote:
>Trying to unmount old root ... <1>Unable to handle kernel NULL pointer
>dereference at virtual address 00000292

Kicks self repeatedly.  Forget my previous mail, you hit a known bug in
2.4.5 kernels which is not compiler dependent.  The fix in Linus's tree is

Index: 5.1/fs/block_dev.c
--- 5.1/fs/block_dev.c Wed, 23 May 2001 11:55:33 +1000 kaos 
(linux-2.4/p/b/16_block_dev. 1.2.2.3 644)
+++ 6-pre3.1/fs/block_dev.c Sat, 09 Jun 2001 11:25:53 +1000 kaos 
(linux-2.4/p/b/16_block_dev. 1.2.2.4 644)
@@ -595,14 +595,15 @@ int check_disk_change(kdev_t dev)
 
 int ioctl_by_bdev(struct block_device *bdev, unsigned cmd, unsigned long arg)
 {
-       kdev_t rdev = to_kdev_t(bdev->bd_dev);
        struct inode inode_fake;
        int res;
        mm_segment_t old_fs = get_fs();
 
        if (!bdev->bd_op->ioctl)
                return -EINVAL;
-       inode_fake.i_rdev=rdev;
+       memset(&inode_fake, 0, sizeof(inode_fake));
+       inode_fake.i_rdev = to_kdev_t(bdev->bd_dev);
+       inode_fake.i_bdev = bdev;
        init_waitqueue_head(&inode_fake.i_wait);
        set_fs(KERNEL_DS);
        res = bdev->bd_op->ioctl(&inode_fake, NULL, cmd, arg);