linux-kernel - Re: [PATCH] powerpc: allow PPC_EARLY_DEBUG_CPM only when SERIAL

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Date:   Fri, 9 Jun 2023 20:11:16 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Kumar Gala <galak@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc: allow PPC_EARLY_DEBUG_CPM only when SERIAL_CPM=y

Hi--

On 5/16/23 11:54, Pali Rohár wrote:
> On Tuesday 16 May 2023 08:28:54 Randy Dunlap wrote:
>> In a randconfig with CONFIG_SERIAL_CPM=m and
>> CONFIG_PPC_EARLY_DEBUG_CPM=y, there is a build error:
>> ERROR: modpost: "udbg_putc" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!
>>
>> Prevent the build error by allowing PPC_EARLY_DEBUG_CPM only when
>> SERIAL_CPM=y.
>>
>> Fixes: c374e00e17f1 ("[POWERPC] Add early debug console for CPM serial ports.")
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: Scott Wood <scottwood@...escale.com>
>> Cc: Kumar Gala <galak@...nel.crashing.org>
>> Cc: "Pali Rohár" <pali@...nel.org>
>> Cc: Michael Ellerman <mpe@...erman.id.au>
>> Cc: Nicholas Piggin <npiggin@...il.com>
>> Cc: Christophe Leroy <christophe.leroy@...roup.eu>
>> Cc: linuxppc-dev@...ts.ozlabs.org
> 
> Looks good,
> 
> Reviewed-by: Pali Rohár <pali@...nel.org>

I'm still seeing this build error in linux-next even with other (PPC) CPM
patches applied.

> 
>> ---
>>  arch/powerpc/Kconfig.debug |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff -- a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
>> --- a/arch/powerpc/Kconfig.debug
>> +++ b/arch/powerpc/Kconfig.debug
>> @@ -240,7 +240,7 @@ config PPC_EARLY_DEBUG_40x
>>  
>>  config PPC_EARLY_DEBUG_CPM
>>  	bool "Early serial debugging for Freescale CPM-based serial ports"
>> -	depends on SERIAL_CPM
>> +	depends on SERIAL_CPM=y
>>  	help
>>  	  Select this to enable early debugging for Freescale chips
>>  	  using a CPM-based serial port.  This assumes that the bootwrapper

-- 
~Randy