linux-kernel - Re: [PATCH] of: fdt: add stub for early_init_dt

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Date:   Thu, 6 Oct 2022 12:43:36 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, Rich Felker <dalias@...c.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] of: fdt: add stub for early_init_dt_scan()



On 10/6/22 12:38, Rob Herring wrote:
> On Wed, Oct 05, 2022 at 08:11:16PM -0700, Randy Dunlap wrote:
>> When CONFIG_OF_EARLY_FLATTREE and CONFIG_SH_DEVICE_TREE are not set,
>> SH3 build fails with a call to early_init_dt_scan(), so add a stub for
>> this function.
>>
>> ../arch/sh/kernel/setup.c: In function 'sh_fdt_init':
>> ../arch/sh/kernel/setup.c:262:26: error: implicit declaration of function 'early_init_dt_scan' [-Werror=implicit-function-declaration]
>>   262 |         if (!dt_virt || !early_init_dt_scan(dt_virt)) {
> 
> I think that sh_fdt_init() needs to be enclosed in 
> CONFIG_OF_EARLY_FLATTREE instead of CONFIG_OF_FLATTREE.
> 

OK, I'll try that. Thanks.

>>
>> Fixes: 7480e0aabd5f ("sh: add device tree support and generic board using device tree")
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: Rob Herring <robh+dt@...nel.org>
>> Cc: Frank Rowand <frowand.list@...il.com>
>> Cc: devicetree@...r.kernel.org
>> Cc: Rich Felker <dalias@...c.org>
>> Cc: Arnd Bergmann <arnd@...db.de>
>> ---
>>  include/linux/of_fdt.h |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> --- a/include/linux/of_fdt.h
>> +++ b/include/linux/of_fdt.h
>> @@ -85,6 +85,7 @@ extern void early_init_devtree(void *);
>>  extern void early_get_first_memblock_info(void *, phys_addr_t *);
>>  #else /* CONFIG_OF_EARLY_FLATTREE */
>>  static inline void early_init_dt_check_for_usable_mem_range(void) {}
>> +static inline bool early_init_dt_scan(void *params) { return false; }
>>  static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
>>  static inline void early_init_fdt_scan_reserved_mem(void) {}
>>  static inline void early_init_fdt_reserve_self(void) {}
>>

-- 
~Randy