Messages in this thread | | | Date | Fri, 21 Nov 2014 09:35:35 -0600 | From | Josh Poimboeuf <> | Subject | Re: [PATCHv3 2/3] kernel: add support for live patching |
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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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