On Tue, 2018-03-13 at 23:14:11 UTC, Michael Ellerman wrote: > 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 <m...@ellerman.id.au> > Reviewed-by: Nicholas Piggin <npig...@gmail.com>
Applied to powerpc fixes. https://git.kernel.org/powerpc/c/e4b79900222b8cccd4da4a7a89581f cheers
