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When running virtualised the powerpc kernel is able to run the system in "compat mode" - which means the kernel and hardware are pretending to userspace that the CPU is an older version than it actually is. AT_BASE_PLATFORM is an AUXV entry that we export to userspace for use when we're running in that mode, which tells userspace the "platform" string for the real CPU version, as opposed to the faked version. Although we don't support compat mode when using DT CPU features, and arguably don't need to set AT_BASE_PLATFORM, the existing cputable based code always sets it even when we're running bare metal. That means the lack of AT_BASE_PLATFORM is a user-visible artifact of the fact that the kernel is using DT CPU features, which we don't want. So set it in the DT CPU features code also. This results in eg: $ LD_SHOW_AUXV=1 /bin/true | grep "AT_.*PLATFORM" AT_PLATFORM: power9 AT_BASE_PLATFORM:power9 Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.