Re: [PATCH v3 1/4] DYNAMIC_FTRACE configurable with and without REGS

[Ard Biesheuvel]

On 1 October 2018 at 17:03, Torsten Duwe <duwe@xxxxxx> wrote:
> On Mon, Oct 01, 2018 at 04:52:27PM +0200, Ard Biesheuvel wrote:
>>
>> I guess we now have Kbuild/Kconfig support for this, no? I mean, we
>> can now show/hide options depending on the capabilities of the
>> toolchain.
>
> Config options depending on flags availability?
>

Yes. Note that 'make menuconfig' now prints the compiler version at
the top, and kconfig options can now 'depend' on compiler features,
although I must admit I don't know how it works.

>> I am not saying it would be a better approach, though - I'd rather
>> have a warning than have things silently disabled, but other people
>> may think differently.
>
> Even then this switch has to be enabled, no matter who or what sets it.
> Note that this patch leaves everything as-is. Only arm64 users with
> "old" compilers would need to take action.
>
>         Torsten
>