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SubjectRe: [PATCHv3 2/3] kernel: add support for live patching
On Fri, Nov 21, 2014 at 04:27:57PM +0100, Jiri Kosina wrote:
> On Fri, 21 Nov 2014, Josh Poimboeuf wrote:
>
> > I think we can use "depends on HAVE_FENTRY" to accomplish this, since
> > CC_USING_FENTRY gets set by the top level kernel Makefile if
> > CONFIG_HAVE_FENTRY is set.
>
> The problem is that HAVE_FENTRY is set automatically on x86_64, no matter
> whether your actual compiler supports it or not.
>
> CC_USING_FENTRY is defined if and only if the actual currently used
> compiler supports it, but that can't be expressed in Kconfig.

Ah, light bulb moment. Now I understand what "$(call cc-option, ...)"
does.

Thanks :-)

--
Josh


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