Comment 6 for bug 1692143

Okay, so the warning is clearly being generated by the WARN_ON function in fs/super.c.
I realize I could disable the warning, but that sounds like a bad idea. One question though,
why would we be verifying if sb->s_bdi is equal to the address of some "struct backing_dev_info noop_backing_dev_info" from either the files /include/linux/backing-dev.h or /mm/backing-dev.c
(Found references to definition of this struct in these two file using the power of grep -rl)
in fs/super.c on line 1281, when we reassign it anyway to a local variable bdi right after? In other words, IS there something going wrong here, or is this warning insignificant and should be removed?

1281: WARN_ON(sb->s_bdi != &noop_backing_dev_info);
1282: sb->s_bdi = bdi;

Also see bug report I filed about this problem at https://bugzilla.kernel.org/show_bug.cgi?id=195809