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c4e5c229b6
Currently kernel build fails under clang if jump labels are enabled. The problem is "X" constraint usage "Any operand whatsoever is allowed", for which clang produces the following: .pushsection __jump_table,"aw" .balign 8 .long 0b-.,.Ltmp577-. .quad %r0+0-. # %r0 is not allowed here .popsection Under gcc constraints "X" or "jdd" (gcc > 9) are used for static keys. Ideally, we'd have used "i" for gcc, but it doesn't work in all cases with -fPIC code. This is gcc-specific problem that doesn't exist in llvm. Since clang does not have "jdd" simply always use "i" constraint for it. Suggested-by: Ulrich Weigand <ulrich.weigand@de.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.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.