linux-kernel - Re: [PATCH] Revert "arm64: defconfig: Enable FSL_MC_BUS and FSL_MC

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Date:   Thu, 20 Dec 2018 16:27:56 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Horia Geantă <horia.geanta@....com>
Cc:     Olof Johansson <olof@...om.net>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        arm-soc <arm@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] Revert "arm64: defconfig: Enable FSL_MC_BUS and FSL_MC_DPIO"

On Wed, Dec 19, 2018 at 11:18 AM Horia Geantă <horia.geanta@....com> wrote:
>
> This reverts commit d9678adbe733a770428a98651beaa2817d503ed3.
>
> Received below report from Stefan.
> Revert the commit until CAAM driver dependency cycles are fixed.
>
> this patch in next-20181214 breaks "make modules_install" for
> arm64/defconfig on my Ubuntu machine:
>
> DEPMOD  4.20.0-rc6-next-20181214
> depmod: ERROR: Found 6 modules in dependency cycles!
> depmod: ERROR: Cycle detected: caamalg_desc -> dpaa2_caam -> authenc
> depmod: ERROR: Cycle detected: caamalg_desc -> dpaa2_caam -> fsl_mc_dpio
> depmod: ERROR: Cycle detected: dpaa2_caam -> caamhash_desc -> dpaa2_caam
> depmod: ERROR: Cycle detected: caamalg_desc -> dpaa2_caam -> caamhash_desc -> error
> depmod: ERROR: Cycle detected: caamalg_desc -> dpaa2_caam -> caamhash_desc -> caamalg_desc
>
> Reported-by: Stefan Wahren <stefan.wahren@...e.com>
> Signed-off-by: Horia Geantă <horia.geanta@....com>

I've applied the revert, but I think there is still a problem, since
anyone could manually enable those options and should not
see those cycles in the module dependencies.

Horia, can you have a look at what caused that and how to fix it?
It's probably a commit in the caam drivers. I have also created
a patch to address a problem with that driver but forgot
to send that out, it might fix this one as well, see my follow-up
patch "crypto: caam/qi2 - add a CRYPTO_DEV_FSL_CAAM
dependency".

       Arnd