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The third argument of div_Xsig() is the output of the division, but is marked
'const', which means the compiler is not expecting it to be updated and may
generate bad code around the call. clang-21 now warns about the pattern since
an uninitialized variable is passed into two 'const' arguments by reference:
arch/x86/math-emu/poly_atan.c:93:28: error: variable 'argSignif' is uninitialized \
when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
93 | div_Xsig(&Numer, &Denom, &argSignif);
| ^~~~~~~~~
arch/x86/math-emu/poly_l2.c:195:29: error: variable 'argSignif' is uninitialized \
when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
195 | div_Xsig(&Numer, &Denom, &argSignif);
| ^~~~~~~~~
The implementation is in assembly, so the problem has gone unnoticed since the
code was added in the linux-1.1 days. Remove the 'const' marker here.
Fixes: e19a1bdb835c ("Import 1.1.38")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20250807205334.123231-1-arnd@kernel.org
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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 reStructuredText 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.