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Combination of LOOKUP_IS_SCOPED and NULL nd->root.mnt is impossible after successful path_init(). All places where ->root.mnt might become NULL do that only if LOOKUP_IS_SCOPED is not there and path_init() itself can return success without setting nd->root only if ND_ROOT_PRESET had been set (in which case nd->root had been set by caller and never changed) or if the name had been a relative one *and* none of the bits in LOOKUP_IS_SCOPED had been present. Since all calls of legitimize_root() must be downstream of successful path_init(), the check for !nd->root.mnt && (nd->flags & LOOKUP_IS_SCOPED) is pure paranoia. FWIW, it had been discussed (and agreed upon) with Aleksa back when scoped lookups had been merged; looks like that had fallen through the cracks back then. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.