linux-kernel - Re: [RESEND PATCH] Bluetooth: btqcomsmd: fix compile-test dependency

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Date:   Mon, 20 Mar 2017 14:36:00 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Bjorn Andersson <bjorn.andersson@...ymobile.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Loic Poulain <loic.poulain@...el.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH] Bluetooth: btqcomsmd: fix compile-test dependency

On Mon 13 Mar 09:06 PDT 2017, Arnd Bergmann wrote:

> compile-testing fails when QCOM_SMD is a loadable module:
> 
> drivers/bluetooth/built-in.o: In function `btqcomsmd_send':
> btqca.c:(.text+0xa8): undefined reference to `qcom_smd_send'
> drivers/bluetooth/built-in.o: In function `btqcomsmd_probe':
> btqca.c:(.text+0x3ec): undefined reference to `qcom_wcnss_open_channel'
> btqca.c:(.text+0x46c): undefined reference to `qcom_smd_set_drvdata'
> 
> This clarifies the dependency to allow compile-testing only when
> SMD is completely disabled, otherwise the dependency on QCOM_SMD
> will make sure we can link against it.
> 
> Fixes: e27ee2b16bad ("Bluetooth: btqcomsmd: Allow driver to build if COMPILE_TEST is enabled")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>

Sorry for the slow response, wanted to make some test-builds before
answering this.

It's valid to set:
COMPILE_TEST=y
QCOM_SMD=y
WCNSS_CTRL=m
BT_QCOMSMD=y

which will cause the qcom_wcnss_open_channel issue above to remain.

For the wcn36xx driver we cover both with:
	depends on QCOM_WCNSS_CTRL || QCOM_WCNSS_CTRL=n
	depends on QCOM_SMD || QCOM_SMD=n

The ath-maintainers  didn't want COMPILE_TEST due to some unrelated
reasons, but I think it's better to express it in two statements, i.e. 

	depends on QCOM_WCNSS_CTRL || (COMPILE_TEST && QCOM_WCNSS_CTRL=n)
	depends on QCOM_SMD || (COMPILE_TEST && QCOM_SMD=n)

Regards,
Bjorn

> ---
> Sent on March 1 2017 originally, still needed for v4.11-rc2
> ---
>  drivers/bluetooth/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
> index c2c14a12713b..2ef2b240b31b 100644
> --- a/drivers/bluetooth/Kconfig
> +++ b/drivers/bluetooth/Kconfig
> @@ -344,7 +344,7 @@ config BT_WILINK
>  
>  config BT_QCOMSMD
>  	tristate "Qualcomm SMD based HCI support"
> -	depends on (QCOM_SMD && QCOM_WCNSS_CTRL) || COMPILE_TEST
> +	depends on (QCOM_SMD && QCOM_WCNSS_CTRL) || (COMPILE_TEST && QCOM_SMD=n)
>  	select BT_QCA
>  	help
>  	  Qualcomm SMD based HCI driver.
> -- 
> 2.9.0
>