netdev - Re: [PATCH 2/2] [v2] qcom_scm: hide Kconfig symbol

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Date:   Tue, 28 Sep 2021 08:29:48 -0500
From:   Alex Elder <elder@...e.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Kalle Valo <kvalo@...eaurora.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Joerg Roedel <joro@...tes.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Alex Elder <elder@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        linux-media@...r.kernel.org, linux-mmc@...r.kernel.org,
        netdev@...r.kernel.org, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 2/2] [v2] qcom_scm: hide Kconfig symbol

On 9/28/21 2:50 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Now that SCM can be a loadable module, we have to add another
> dependency to avoid link failures when ipa or adreno-gpu are
> built-in:
> 
> aarch64-linux-ld: drivers/net/ipa/ipa_main.o: in function `ipa_probe':
> ipa_main.c:(.text+0xfc4): undefined reference to `qcom_scm_is_available'
> 
> ld.lld: error: undefined symbol: qcom_scm_is_available
>>>> referenced by adreno_gpu.c
>>>>                gpu/drm/msm/adreno/adreno_gpu.o:(adreno_zap_shader_load) in archive drivers/built-in.a
> 
> This can happen when CONFIG_ARCH_QCOM is disabled and we don't select
> QCOM_MDT_LOADER, but some other module selects QCOM_SCM. Ideally we'd
> use a similar dependency here to what we have for QCOM_RPROC_COMMON,
> but that causes dependency loops from other things selecting QCOM_SCM.
> 
> This appears to be an endless problem, so try something different this
> time:
> 
>   - CONFIG_QCOM_SCM becomes a hidden symbol that nothing 'depends on'
>     but that is simply selected by all of its users
> 
>   - All the stubs in include/linux/qcom_scm.h can go away
> 
>   - arm-smccc.h needs to provide a stub for __arm_smccc_smc() to
>     allow compile-testing QCOM_SCM on all architectures.
> 
>   - To avoid a circular dependency chain involving RESET_CONTROLLER
>     and PINCTRL_SUNXI, drop the 'select RESET_CONTROLLER' statement.
>     According to my testing this still builds fine, and the QCOM
>     platform selects this symbol already.
> 
> Acked-by: Kalle Valo <kvalo@...eaurora.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> Changes in v2:
>    - drop the 'select RESET_CONTROLLER' line, rather than adding
>      more of the same
> ---
>   drivers/firmware/Kconfig                |  5 +-
>   drivers/gpu/drm/msm/Kconfig             |  4 +-
>   drivers/iommu/Kconfig                   |  2 +-
>   drivers/media/platform/Kconfig          |  2 +-
>   drivers/mmc/host/Kconfig                |  2 +-
>   drivers/net/ipa/Kconfig                 |  1 +

For drivers/net/ipa/Kconfig, looks good to me.
Nice simplification.

Acked-by: Alex Elder <elder@...aro.org>

>   drivers/net/wireless/ath/ath10k/Kconfig |  2 +-
>   drivers/pinctrl/qcom/Kconfig            |  3 +-
>   include/linux/arm-smccc.h               | 10 ++++
>   include/linux/qcom_scm.h                | 71 -------------------------
>   10 files changed, 20 insertions(+), 82 deletions(-)
> 

. . .