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997931ce02
A MAP_SHARED mapping always has VM_MAYSHARE set, and writable (VM_MAYWRITE) MAP_SHARED mappings have VM_SHARED set as well. To identify a MAP_SHARED mapping, it's sufficient to look at VM_MAYSHARE. We cannot have VM_MAYSHARE|VM_WRITE mappings without having VM_SHARED set. Consequently, current code will never actually end up clearing VM_MAYSHARE and that code is confusing, because nobody is supposed to mess with VM_MAYWRITE. Let's clean it up and restructure the code. No functional change intended. Link: https://lkml.kernel.org/r/20230102160856.500584-4-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Nicolas Pitre <nico@fluxnic.net> Cc: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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.