linux-kernel - Re: [PATCH] iommu/renesas: Support riscv compile

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Date:   Fri, 16 Dec 2022 09:32:03 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     palmer@...belt.com, prabhakar.mahadev-lad.rj@...renesas.com,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        iommu@...ts.linux.dev, Guo Ren <guoren@...ux.alibaba.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] iommu/renesas: Support riscv compile

On Fri, Dec 16, 2022 at 1:16 AM Robin Murphy <robin.murphy@....com> wrote:
>
> On 2022-12-15 07:32, guoren@...nel.org wrote:
> > From: Guo Ren <guoren@...ux.alibaba.com>
> >
> > After riscv selects ARCH_RENESAS, we need to add ARM64 || ARM
> > dependency here.
>
> This effectively removes all the extra COMPILE_TEST coverage we've been
> enjoying. FWIW I prefer Geert's suggestion to separate the real
> functional dependency from implicit assumptions about ARCH_RENESAS, with
> something like:
>
>         depends on ARCH_RENESAS || COMPILE_TEST
>         depends on !GENERIC_ATOMIC64    #for IOMMU_IO_PGTABLE_LPAE

The problem is from clang version 16.0.0, and gcc version 12.2.0 () is
okay. I didn't recognize COMPILE_TEST could utilize the x86(another
arch) to test the arm driver.

How About:

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index dc5f7a156ff5..a2e259da5a6a 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -283,6 +283,7 @@ config EXYNOS_IOMMU_DEBUG

 config IPMMU_VMSA
        bool "Renesas VMSA-compatible IPMMU"
+       depends on !RISCV
        depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
        select IOMMU_API
        select IOMMU_IO_PGTABLE_LPAE

>
> Thanks,
> Robin.
>
> > Reported-by: kernel test robot <lkp@...el.com>
> > Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> > Signed-off-by: Guo Ren <guoren@...nel.org>
> > ---
> >   drivers/iommu/Kconfig | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> > index dc5f7a156ff5..746b95b9f345 100644
> > --- a/drivers/iommu/Kconfig
> > +++ b/drivers/iommu/Kconfig
> > @@ -283,6 +283,7 @@ config EXYNOS_IOMMU_DEBUG
> >
> >   config IPMMU_VMSA
> >       bool "Renesas VMSA-compatible IPMMU"
> > +     depends on ARM64 || ARM
> >       depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
> >       select IOMMU_API
> >       select IOMMU_IO_PGTABLE_LPAE



--
Best Regards
 Guo Ren