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With commit27267655c5("openrisc: Support floating point user api") I added an entry to the struct sigcontext which caused an unwanted change to the userspace ABI. To fix this we use the previously unused oldmask field space for the floating point fpcsr state. We do this with a union to restore the ABI back to the pre kernel v6.4 ABI and keep API compatibility. This does mean if there is some code somewhere that is setting oldmask in an OpenRISC specific userspace sighandler it would end up setting the floating point register status, but I think it's unlikely as oldmask was never functional before. Fixes:27267655c5("openrisc: Support floating point user api") Reported-by: Szabolcs Nagy <nsz@port70.net> Closes: https://lore.kernel.org/openrisc/20230626213840.GA1236108@port70.net/ Signed-off-by: Stafford Horne <shorne@gmail.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.