linux-kernel - Re: [RFC PATCH] xtensa: setup: use CONFIG_USE_OF instead of CONFIG

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Date:   Sun, 26 Sep 2021 14:48:31 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Max Filippov <jcmvbkbc@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Chris Zankel <chris@...kel.net>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>
Subject: Re: [RFC PATCH] xtensa: setup: use CONFIG_USE_OF instead of CONFIG_OF

On 9/26/21 11:55 AM, Max Filippov wrote:
> Hi Randy,
> 
> On Fri, Sep 24, 2021 at 8:29 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>> CONFIG_OF can be set by a randconfig or by a user -- without setting the
>> early flattree option (OF_EARLY_FLATTREE).  This causes build errors.
>> However, if randconfig or a user sets USE_OF in the Xtensa config,
>> the right kconfig symbols are set to enable xtensa/kernel/setup.c to
>> build.
>>
>> Fixes these build errors:
>>
>> ../arch/xtensa/kernel/setup.c: In function 'xtensa_dt_io_area':
>> ../arch/xtensa/kernel/setup.c:201:14: error: implicit declaration of function 'of_flat_dt_is_compatible'; did you mean 'of_machine_is_compatible'? [-Werror=implicit-function-declaration]
>>    201 |         if (!of_flat_dt_is_compatible(node, "simple-bus"))
>> ../arch/xtensa/kernel/setup.c:204:18: error: implicit declaration of function 'of_get_flat_dt_prop' [-Werror=implicit-function-declaration]
>>    204 |         ranges = of_get_flat_dt_prop(node, "ranges", &len);
>> ../arch/xtensa/kernel/setup.c:204:16: error: assignment to 'const __be32 *' {aka 'const unsigned int *'} from 'int' makes pointer from integer without a cast [-Werror=int-conversion]
>>    204 |         ranges = of_get_flat_dt_prop(node, "ranges", &len);
>>        |                ^
>> ../arch/xtensa/kernel/setup.c: In function 'early_init_devtree':
>> ../arch/xtensa/kernel/setup.c:228:9: error: implicit declaration of function 'early_init_dt_scan'; did you mean 'early_init_devtree'? [-Werror=implicit-function-declaration]
>>    228 |         early_init_dt_scan(params);
>> ../arch/xtensa/kernel/setup.c:229:9: error: implicit declaration of function 'of_scan_flat_dt' [-Werror=implicit-function-declaration]
>>    229 |         of_scan_flat_dt(xtensa_dt_io_area, NULL);
>>
>> Fixes: da844a81779e ("xtensa: add device trees support")
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: Max Filippov <jcmvbkbc@...il.com>
>> Cc: Chris Zankel <chris@...kel.net>
>> Cc: linux-xtensa@...ux-xtensa.org
>> ---
>>   arch/xtensa/kernel/setup.c |    6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> Thanks for your RFC. I've tested it and found a couple more places
> where CONFIG_USE_OF should be used instead of CONFIG_OF.
> I'll post the revised version.
> 

Hi Max,
Thanks for checking and for the extra fixes.
Looks good.

-- 
~Randy