linux-kernel - Re: [PATCH 7/7] serial: allow COMPILE

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Date:   Thu, 30 Mar 2023 12:28:00 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jiri Slaby <jslaby@...e.cz>, gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] serial: allow COMPILE_TEST for some drivers

Hi Jiri,

On 4/21/22 03:17, Jiri Slaby wrote:
> Some more serial drivers can be compile-tested under certain
> circumstances (when building a specific architecture). So allow for
> that.
> 
> This reduces the need of zillion mach/subarch-specific configs. And
> since the 0day bot has only allmodconfig's for some archs, this
> increases build coverage there too.
> 
> Note that cpm needs a minor update in the header, so that it drags in
> at least some defines (CPM2 ones).
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> ---
>  drivers/tty/serial/Kconfig             | 6 +++---
>  drivers/tty/serial/cpm_uart/cpm_uart.h | 2 ++
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index 20cb103972fa..2d3eed53b43e 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -782,7 +782,7 @@ config SERIAL_PMACZILOG_CONSOLE
>  
>  config SERIAL_CPM
>  	tristate "CPM SCC/SMC serial port support"
> -	depends on CPM2 || CPM1
> +	depends on CPM2 || CPM1 || (PPC32 && COMPILE_TEST)


This patch (now commit e3e7b13bffae) causes build errors
when neither CPM1 nor CPM2 is set but PPC32=y and COMPILE_TEST=y:

ERROR: modpost: "cpm_uart_freebuf" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!
ERROR: modpost: "cpm_uart_allocbuf" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!
ERROR: modpost: "cpm_line_cr_cmd" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!
ERROR: modpost: "__cpm2_setbrg" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!
ERROR: modpost: "cpm_uart_unmap_pram" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!
ERROR: modpost: "cpm_uart_map_pram" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!

>  	select SERIAL_CORE
>  	help
>  	  This driver supports the SCC and SMC serial ports on Motorola 
> @@ -806,7 +806,7 @@ config SERIAL_CPM_CONSOLE
>  
>  config SERIAL_PIC32
>  	tristate "Microchip PIC32 serial support"
> -	depends on MACH_PIC32
> +	depends on MACH_PIC32 || (MIPS && COMPILE_TEST)
>  	select SERIAL_CORE
>  	help
>  	  If you have a PIC32, this driver supports the serial ports.
> @@ -1246,7 +1246,7 @@ config SERIAL_XILINX_PS_UART_CONSOLE
>  
>  config SERIAL_AR933X
>  	tristate "AR933X serial port support"
> -	depends on HAVE_CLK && ATH79
> +	depends on (HAVE_CLK && ATH79) || (MIPS && COMPILE_TEST)
>  	select SERIAL_CORE
>  	select SERIAL_MCTRL_GPIO if GPIOLIB
>  	help
> diff --git a/drivers/tty/serial/cpm_uart/cpm_uart.h b/drivers/tty/serial/cpm_uart/cpm_uart.h
> index 6113b953ce25..8c582779cf22 100644
> --- a/drivers/tty/serial/cpm_uart/cpm_uart.h
> +++ b/drivers/tty/serial/cpm_uart/cpm_uart.h
> @@ -19,6 +19,8 @@ struct gpio_desc;
>  #include "cpm_uart_cpm2.h"
>  #elif defined(CONFIG_CPM1)
>  #include "cpm_uart_cpm1.h"
> +#elif defined(CONFIG_COMPILE_TEST)
> +#include "cpm_uart_cpm2.h"
>  #endif
>  
>  #define SERIAL_CPM_MAJOR	204

-- 
~Randy