linux-kernel - Re: [PATCH] powerpc/8xx: export 'cpm

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Message-ID: <e8e78537-0775-95b2-3161-5b5e07e784fe@infradead.org>
Date:   Thu, 21 Jan 2021 22:11:22 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/8xx: export 'cpm_setbrg' for modules

On 1/21/21 9:51 PM, Christophe Leroy wrote:
> 
> 
> Le 22/01/2021 à 02:08, Randy Dunlap a écrit :
>> Fix missing export for a loadable module build:
>>
>> ERROR: modpost: "cpm_setbrg" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!
>>
>> Fixes: 4128a89ac80d ("powerpc/8xx: move CPM1 related files from sysdev/ to platforms/8xx")
> 
> I don't understand. Before that commit cpm_setbrg() wasn't exported either.
> 
> For me, it fixes the commit that brought the capability to build the cpm uart driver as a module, that is commit 1da177e4c3f4 ("Linux-2.6.12-rc")

OK, I didn't have a lot of confidence in that tag.

Thanks for commenting.

>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Reported-by: kernel test robot <lkp@...el.com>
>> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
>> Cc: clang-built-linux@...glegroups.com
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Christophe Leroy <christophe.leroy@....fr>
>> Cc: Michael Ellerman <mpe@...erman.id.au>
>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> Cc: Paul Mackerras <paulus@...ba.org>
>> Cc: linuxppc-dev@...ts.ozlabs.org
>> ---
>>   arch/powerpc/platforms/8xx/cpm1.c |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> --- linux-next-20210121.orig/arch/powerpc/platforms/8xx/cpm1.c
>> +++ linux-next-20210121/arch/powerpc/platforms/8xx/cpm1.c
>> @@ -280,6 +280,7 @@ cpm_setbrg(uint brg, uint rate)
>>           out_be32(bp, (((BRG_UART_CLK_DIV16 / rate) - 1) << 1) |
>>                     CPM_BRG_EN | CPM_BRG_DIV16);
>>   }
>> +EXPORT_SYMBOL(cpm_setbrg);
>>     struct cpm_ioport16 {
>>       __be16 dir, par, odr_sor, dat, intr;
>>


-- 
~Randy
RFC: Features and documentation: http://lwn.net/Articles/260136/