On Wed, 2018-02-07 at 11:07 +0100, Pavel Machek wrote: > This is really unfortunate naming of kernel option. > > spectre_v2=off sounds like we are turning the "bug" off, but i somehow > suspect you are turning the bug _workaround_ off.
That's consistent with what we have on x86. > > +ifdef CONFIG_EXPOLINE > > + ifeq ($(call cc-option-yn,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),y) > > + CC_FLAGS_EXPOLINE := -mindirect-branch=thunk > > + CC_FLAGS_EXPOLINE += -mfunction-return=thunk > > + CC_FLAGS_EXPOLINE += -mindirect-branch-table > > + export CC_FLAGS_EXPOLINE > > + cflags-y += $(CC_FLAGS_EXPOLINE) > > + else > > + $(warning "Your gcc lacks the -mindirect-branch= option") > > + endif > > +endif That isn't, though. Linus asked us to drop the $(warning) part. ... and then spent a week building with a non-retpoline compiler and not noticing, so he might have changed his mind ;)
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