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2015-08-13Documentation: describe how to add a system callDavid Drysdale
Add a document describing the process of adding a new system call, including the need for a flags argument for future compatibility, and covering 32-bit/64-bit concerns (albeit in an x86-centric way). Signed-off-by: David Drysdale <drysdale@google.com> Reviewed-by: Michael Kerrisk <mtk.manpages@gmail.com> Reviewed-by: Eric B Munson <emunson@akamai.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>