[PATCH v2 5/6] arm64: Advertise CPUs capable of running 32-bit applications in sysfs

[Greg Kroah-Hartman]

On Mon, Nov 09, 2020 at 09:30:21PM +0000, Will Deacon wrote:
> Since 32-bit applications will be killed if they are caught trying to
> execute on a 64-bit-only CPU in a mismatched system, advertise the set
> of 32-bit capable CPUs to userspace in sysfs.
> 
> Signed-off-by: Will Deacon <will at kernel.org>
> ---
>  .../ABI/testing/sysfs-devices-system-cpu      |  9 +++++++++
>  arch/arm64/kernel/cpufeature.c                | 19 +++++++++++++++++++
>  2 files changed, 28 insertions(+)

I still think the "kill processes that can not run on this CPU" is crazy
but that has nothing to do with this sysfs file patch, which looks good
to me:

Reviewed-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>