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Date:   Tue, 18 Dec 2018 21:10:30 +0100 (CET)
From:   Stefan Wahren <stefan.wahren@i2se.com>
To:     Horia Geanta <horia.geanta@nxp.com>
Cc:     Stephen Rothwell <sfr@canb.auug.org.au>, arm-soc <arm@kernel.org>,
        Marc Gonzalez <marc.w.gonzalez@free.fr>,
        Olof Johansson <olof@lixom.net>,
        LKML <linux-kernel@vger.kernel.org>, linux-next@vger.kernel.org,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
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Subject: Re: [PATCH v3 7/9] arm64: defconfig: Enable FSL_MC_BUS and
 FSL_MC_DPIO
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Hi Horia,

> Horia Geanta <horia.geanta@nxp.com> hat am 17. Dezember 2018 um 16:33 geschrieben:
> 
> 
> On 12/15/2018 11:44 PM, Stefan Wahren wrote:
> > Hi,
> > 
> >> Olof Johansson <olof@lixom.net> hat am 13. Dezember 2018 um 07:48 geschrieben:
> >>
> >>
> >> On Fri, Nov 09, 2018 at 06:05:24AM +0000, Horia Geanta wrote:
> >>> On 11/9/2018 3:11 AM, Marc Gonzalez wrote:
> >>>> Commit e8342cc7954e ("enable CAAM crypto engine on QorIQ DPAA2 SoCs")
> >>>> enabled CRYPTO_DEV_FSL_DPAA2_CAAM, which depends on FSL_MC_DPIO,
> >>>> which is not set. Enable FSL_MC_BUS, and build FSL_MC_DPIO and
> >>>> CRYPTO_DEV_FSL_DPAA2_CAAM as modules.
> >>>>
> >>>> Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
> >>> Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
> >>
> >> I had to redo this one, and when I did I noticed that there's also an ethernet
> >> driver. Should that be enabled as well?
> >>
> > 
> > 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
> > 
> > After reverting of this patch the issue disappeared.
> > 
> Seems there's a dependency cycle b/w dpaa2_caam and caam{alg,hash}_desc, as follows:
> 
> A->B
> ---
> dpaa2_caam needs cnstr_* exported by caam{alg,hash}_desc
> 
> B->A
> ---
> caam{alg,hash}_desc need caam_imx, caam_little_end:
> caam{hash,alg}_desc.c
> 	--> desc_constr.h (included for descriptors generation functions)
> 		--> regs.h (included for endianness helpers)
> 			--> extern bool caam_imx, caam_little_end
> caam_imx, caam_little_end are exported by dpaa2_caam - caamalg_qi2.c (when
> CONFIG_CRYPTO_DEV_FSL_CAAM=n)
> 
> Could we drop this patch, until CAAM driver gets a proper fix (which is not
> straightforward)?

this issue still persists in 4.20.0-rc7-next-20181218. Could you please send a patch to revert this change?

Thanks Stefan

> 
> Thanks,
> Horia
> 
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