877cff5296
The 64bit register constrains in __arch_hweight64() cannot be fulfilled in a 32-bit build. The function is only declared but not used within vclock_gettime.c and gcc does not care. LLVM complains and aborts. Reportedly because it validates extended asm even if latter would get compiled out, see https://lore.kernel.org/r/Y%2BJ%2BUQ1vAKr6RHuH@dev-arch.thelio-3990X i.e., a long standing design difference between gcc and LLVM. Move the "fake a 32 bit kernel configuration" bits from vclock_gettime.c into a common header file. Use this from vclock_gettime.c and vgetcpu.c. [ bp: Add background info from Nathan. ] Fixes: 92d33063c081a ("x86/vdso: Provide getcpu for x86-32.") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/Y+IsCWQdXEr8d9Vy@linutronix.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.