linux-kernel - Re: [PATCH v2 1/5] memblock test: fix implicit declaration of function 'virt_to

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Message-ID: <20240801000739.lrgmokbbgvikrlkw@master>
Date: Thu, 1 Aug 2024 00:07:39 +0000
From: Wei Yang <richard.weiyang@...il.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: Wei Yang <richard.weiyang@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v2 1/5] memblock test: fix implicit declaration of
 function 'virt_to_phys'

On Mon, Jul 29, 2024 at 08:37:23AM +0300, Mike Rapoport wrote:
>On Mon, Jul 29, 2024 at 01:47:21AM +0000, Wei Yang wrote:
>> Commit 94ff46de4a73 ("memblock: Move late alloc warning down to phys
>> alloc") introduce the usage of virt_to_phys(), which is not defined in
>> memblock tests.
>> 
>> Define it in mm.h to fix the build error.
>> 
>> Signed-off-by: Wei Yang <richard.weiyang@...il.com>
>> 
>> ---
>> v2: move definition to mm.h
>> ---
>>  tools/include/linux/mm.h | 2 ++
>>  1 file changed, 2 insertions(+)
>> 
>> diff --git a/tools/include/linux/mm.h b/tools/include/linux/mm.h
>> index cad4f2927983..9db45c5d00fc 100644
>> --- a/tools/include/linux/mm.h
>> +++ b/tools/include/linux/mm.h
>> @@ -20,6 +20,8 @@
>>  #define pfn_to_page(pfn) ((void *)((pfn) * PAGE_SIZE))
>>  
>>  #define phys_to_virt phys_to_virt
>> +#define virt_to_phys(p) ((unsigned long)p)
>> +
>
>Please don't break #define of phys_to_virt from the static inline
>implementation.
>

I don't touch the definition of phys_to_virt, so you are willing me to adjust
it?

The macro here will be expanded to code at preprocessing stage. I don't get
how static inline would help here. Do I miss something?

>And please make virt_to_phys a static inline similarly to phys_to_virt.
>
>>  static inline void *phys_to_virt(unsigned long address)
>>  {
>>  	return __va(address);
>> -- 
>> 2.34.1
>> 
>
>-- 
>Sincerely yours,
>Mike.

-- 
Wei Yang
Help you, Help me