Re: [PATCH][mount-7-1-B] fixes to pre7-1 and more mount cleanups

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Alexander, there seems to be a problem still with the mntent changes
in pre7-1. For example, if you create a kernel thread during bootup
without CLONE_FS, the __copy_fs_struct will barf on the NULL
rootmnt/root/pwdmnt/pwd members coming from INIT_FS. I actually
have this happening on Sparc64 with pre7-1 which is how I found
the problem.

I think to fix this, mntget/mntput should be defined analogously to
dget/dput in that they just do nothing if the argument is NULL.

Later,
David S. Miller
davem@redhat.com

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