linux-kernel - Re: [PATCH] remoteproc: fix linking against QMP

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Date:   Tue, 19 Oct 2021 23:23:41 -0500
From:   Stephen Boyd <swboyd@...omium.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Sibi Sankar <sibis@...eaurora.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Peng Fan <peng.fan@....com>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remoteproc: fix linking against QMP

Quoting Arnd Bergmann (2021-10-19 08:38:04)
> From: Arnd Bergmann <arnd@...db.de>
>
> With QCOM_AOSS_QMP=m, the built-in q6v5 code fails to link:
>
> ld.lld: error: undefined symbol: qmp_send
> >>> referenced by qcom_q6v5.c
> >>>               remoteproc/qcom_q6v5.o:(q6v5_load_state_toggle) in archive drivers/built-in.a
>
> ld.lld: error: undefined symbol: qmp_get
> >>> referenced by qcom_q6v5.c
> >>>               remoteproc/qcom_q6v5.o:(qcom_q6v5_init) in archive drivers/built-in.a
>
> ld.lld: error: undefined symbol: qmp_put
> >>> referenced by qcom_q6v5.c
> >>>               remoteproc/qcom_q6v5.o:(qcom_q6v5_init) in archive drivers/built-in.a
> >>> referenced by qcom_q6v5.c
> >>>               remoteproc/qcom_q6v5.o:(qcom_q6v5_deinit) in archive drivers/built-in.a
>
> Apparently it is meant to work without that code, so add
> another hacky dependency to prevent the broken link, but
> explicitly allow it to be built without QCOM_AOSS_QMP.
>
> QCOM_Q6V5_COMMON is a hidden symbol, but add the dependency
> there anyway to give a hint in case another user comes up and
> misses gets this wrong again.
>
> Fixes: c1fe10d238c0 ("remoteproc: qcom: q6v5: Use qmp_send to update co-processor load state")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>