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setup_kup() is used by both 64-bit and 32-bit code. However on 64-bit it must not be __init, because it's used for CPU hotplug, whereas on 32-bit it should be __init because it calls setup_kuap/kuep() which are __init. We worked around that problem in the past by marking it __ref, see commit67d53f30e2("powerpc/mm: fix section mismatch for setup_kup()"). Marking it __ref basically just omits it from section mismatch checking, which can lead to bugs, and in fact it did, see commit44b4c4450f("powerpc/64s: Mark the kuap/kuep functions non __init") We can avoid all these problems by just making it static inline. Because all it does is call other functions, making it inline actually shrinks the 32-bit vmlinux by ~76 bytes. Make it __always_inline as pointed out by Christophe. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201214123011.311024-1-mpe@ellerman.id.au
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.