BUG [2.6.9-rc4] tmpfs is mountable even when not configured but non-functional

[Micha Feigin]

I don't have tmpfs configured into my kernel

# CONFIG_TMPFS is not set

but I can still mount tmpfs, so mount -t tmpfs none /dev/shm works and I
get in the output of mount:

...
none on /dev/shm type tmpfs (rw)
...

when I try ls on that directory I get:

ls: /dev/shm/: Not a directory
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