On Tue, 30 May 2017 16:28:09 +1000
Michael Ellerman <m...@ellerman.id.au> wrote:
> From: Nicholas Piggin <npig...@gmail.com>
>
> Provide a dt_cpu_ftrs= cmdline option to disable the dt_cpu_ftrs CPU
> feature discovery, and fall back to the "cputable" based version.
>
> Also allow control of advertising unknown features to userspace and
> with this parameter, and remove the clunky CONFIG option.
>
> Signed-off-by: Nicholas Piggin <npig...@gmail.com>
> [mpe: Add explicit early check of bootargs in dt_cpu_ftrs_init()]
Thanks for fixing that up. The patch is more yours than mine now :P
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -866,6 +866,16 @@
>
> dscc4.setup= [NET]
>
> + dt_cpu_ftrs= [PPC]
> + Format: {"off" | "known"}
> + Control how the dt_cpu_ftrs device-tree binding is
> + used for CPU feature discovery and setup (if it
> + exists).
> + off: Do not use it, fall back to legacy cpu table.
> + known: Do not pass through unknown features to guests
> + or userspace, only those that the kernel is not aware
> + of.
Well that's not the right number of nots. Better make it:
+ known: Do not pass through unknown features to guests
+ or userspace, only those that the kernel is not not
+ aware of.
