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__generic_cmpxchg_local takes unsigned long old/new arguments which might end up being up-cast from smaller signed types (which will sign-extend). The loaded compare value must be compared against a truncated smaller type, so down-cast appropriately for each size. The issue is apparent on 64-bit machines with code, such as atomic_dec_unless_positive(), that sign-extends from int. 64-bit machines generally don't use the generic cmpxchg but development/early ports might make use of it, so make it correct. Signed-off-by: Matt Evans <mev@rivosinc.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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.