linux-kernel - Re: [RFC][PATCH] iommu: Kconfig: Fix missing config option for CONFIG_ARM_SMMU

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Date:   Mon, 11 Oct 2021 20:51:04 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        Amit Pundir <amit.pundir@...aro.org>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [RFC][PATCH] iommu: Kconfig: Fix missing config option for CONFIG_ARM_SMMU_QCOM

On Mon, Oct 11, 2021 at 8:37 PM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Mon 11 Oct 22:26 CDT 2021, John Stultz wrote:
>
> > In commit 424953cf3c665 ("qcom_scm: hide Kconfig symbol"), some
> > logic was added to make the code depend on CONFIG_ARM_SMMU_QCOM,
> > however no such option exist.
> >
> > This caused regressions on db845c (and I suspect other qcom
> > platforms), but can be easily fixed up by adding a new option
> > to re-enable the newly conditionalized code.
> >
> > I set it to default to ARCH_QCOM, so folks don't have to
> > discover this new option to keep things booting, but if folks
> > would rather, I'm ok to drop that line.
> >
>
> I've not looked where the discussion went, but Dmitry posted this end of
> last week:
>
> https://lore.kernel.org/linux-arm-msm/20211010023350.978638-1-dmitry.baryshkov@linaro.org/

Oh, my apologies for not seeing this! I did search my mail log
earlier, but I must have missed it.

So yes, I validated earlier that reverting the problematic chunks
works as well, and I see Arnd did already have a similar patch to what
I sent out.

I'd probably lean towards Arnd's patch, as he has been uncovering the
problematic Kconfig edge cases.

thanks
-john