linux-kernel - Re: [PATCH v2] soundwire: Make slave.o depend on ACPI and rename to acpi

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Date:   Tue, 13 Aug 2019 13:37:13 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org, LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH v2] soundwire: Make slave.o depend on ACPI and rename to acpi_slave.o

On Tue, Aug 13, 2019 at 11:12 AM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> clang warns when CONFIG_ACPI is unset:
>
> ../drivers/soundwire/slave.c:16:12: warning: unused function
> 'sdw_slave_add' [-Wunused-function]
> static int sdw_slave_add(struct sdw_bus *bus,
>            ^
> 1 warning generated.
>
> Before commit 8676b3ca4673 ("soundwire: fix regmap dependencies and
> align with other serial links"), this code would only be compiled when
> ACPI was set because it was only selected by SOUNDWIRE_INTEL, which
> depends on ACPI.
>
> Now, this code can be compiled without CONFIG_ACPI, which causes the
> above warning. The IS_ENABLED(CONFIG_ACPI) guard could be moved to avoid
> compiling the function; however, slave.c only contains three functions,
> two of which are static. Since slave.c is completetely dependent on
> ACPI, rename it to acpi_slave.c and only compile it when CONFIG_ACPI
> is set so sdw_acpi_find_slaves will actually be used. bus.h contains
> a stub for sdw_acpi_find_slaves so there will be no issues with an
> undefined function.
>
> This has been build tested with CONFIG_ACPI set and unset in combination
> with CONFIG_SOUNDWIRE unset, built in, and a module.
>
> Fixes: 8676b3ca4673 ("soundwire: fix regmap dependencies and align with other serial links")
> Link: https://github.com/ClangBuiltLinux/linux/issues/637
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Looks good, thanks Nathan.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>
> v1 -> v2:
>
> * Rename slave.o to acpi_slave.o
> * Reword commit message to reflect this
>
>  drivers/soundwire/Makefile                  | 6 +++++-
>  drivers/soundwire/{slave.c => acpi_slave.c} | 3 ---
>  2 files changed, 5 insertions(+), 4 deletions(-)
>  rename drivers/soundwire/{slave.c => acpi_slave.c} (98%)
>
> diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile
> index 45b7e5001653..718d8dd0ac79 100644
> --- a/drivers/soundwire/Makefile
> +++ b/drivers/soundwire/Makefile
> @@ -4,9 +4,13 @@
>  #
>
>  #Bus Objs
> -soundwire-bus-objs := bus_type.o bus.o slave.o mipi_disco.o stream.o
> +soundwire-bus-objs := bus_type.o bus.o mipi_disco.o stream.o
>  obj-$(CONFIG_SOUNDWIRE) += soundwire-bus.o
>
> +ifdef CONFIG_ACPI
> +soundwire-bus-objs += acpi_slave.o
> +endif
> +
>  #Cadence Objs
>  soundwire-cadence-objs := cadence_master.o
>  obj-$(CONFIG_SOUNDWIRE_CADENCE) += soundwire-cadence.o
> diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/acpi_slave.c
> similarity index 98%
> rename from drivers/soundwire/slave.c
> rename to drivers/soundwire/acpi_slave.c
> index f39a5815e25d..0dc188e6873b 100644
> --- a/drivers/soundwire/slave.c
> +++ b/drivers/soundwire/acpi_slave.c
> @@ -60,7 +60,6 @@ static int sdw_slave_add(struct sdw_bus *bus,
>         return ret;
>  }
>
> -#if IS_ENABLED(CONFIG_ACPI)
>  /*
>   * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
>   * @bus: SDW bus instance
> @@ -110,5 +109,3 @@ int sdw_acpi_find_slaves(struct sdw_bus *bus)
>
>         return 0;
>  }
> -
> -#endif
> --
> 2.23.0.rc2
>
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-- 
Thanks,
~Nick Desaulniers