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Instead of special-casing the specific case of shared registers, create a default SYSCALL_RET_SET() macro (mirroring SYSCALL_NUM_SET()), that writes to the SYSCALL_RET register. For architectures that can't set the return value (for whatever reason), they can define SYSCALL_RET_SET() without an associated SYSCALL_RET() macro. This also paves the way for architectures that need to do special things to set the return value (e.g. powerpc). Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/lkml/20200912110820.597135-12-keescook@chromium.org Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
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.