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Commit9975f852ce("powerpc/uaccess: Remove calls to __get_user_bad() and __put_user_bad()") switch to BUILD_BUG() in the default case, which leaves x uninitialized. This will not be an issue because the build will be broken in that case but clang does static analysis before it realizes the default case will be done so it warns about x being uninitialized (trimmed for brevity): In file included from mm/mprotect.c:13: In file included from ./include/linux/hugetlb.h:28: In file included from ./include/linux/mempolicy.h:16: ./include/linux/pagemap.h:772:16: warning: variable '__gu_val' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized] if (unlikely(__get_user(c, uaddr) != 0)) ^~~~~~~~~~~~~~~~~~~~ ./arch/powerpc/include/asm/uaccess.h:266:2: note: expanded from macro '__get_user' __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./arch/powerpc/include/asm/uaccess.h:235:2: note: expanded from macro '__get_user_size_allowed' default: BUILD_BUG(); \ ^~~~~~~ Commit5cd29b1fd3("powerpc/uaccess: Use asm goto for get_user when compiler supports it") added an initialization for x because of the same reason. Do the same thing here so there is no warning across all versions of clang. Signed-off-by: Nathan Chancellor <nathan@kernel.org> Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://github.com/ClangBuiltLinux/linux/issues/1359 Link: https://lore.kernel.org/r/20210426203518.981550-1-nathan@kernel.org
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.