linux-kernel - Re: [PATCH v3 1/5] memblock test: fix implicit declaration of function 'virt_to

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Message-ID: <20240805153720.myjqd6ur65x5ucsu@master>
Date: Mon, 5 Aug 2024 15:37:20 +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 v3 1/5] memblock test: fix implicit declaration of
 function 'virt_to_phys'

On Mon, Aug 05, 2024 at 01:03:14PM +0300, Mike Rapoport wrote:
>On Fri, Aug 02, 2024 at 01:09:19AM +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>
>> 
>> ---
>> v3: use static inline as phys_to_virt
>> v2: move definition to mm.h
>> ---
>>  tools/include/linux/mm.h | 6 ++++++
>>  1 file changed, 6 insertions(+)
>> 
>> diff --git a/tools/include/linux/mm.h b/tools/include/linux/mm.h
>> index cad4f2927983..c9e915914add 100644
>> --- a/tools/include/linux/mm.h
>> +++ b/tools/include/linux/mm.h
>> @@ -25,6 +25,12 @@ static inline void *phys_to_virt(unsigned long address)
>>  	return __va(address);
>>  }
>>  
>> +#define virt_to_phys virt_to_phys
>> +static inline phys_addr_t virt_to_phys(volatile void *address)
>
>Why volatilte?
>

There are two definitions of virt_to_phys:

  include/asm-generic/io.h
  arch/x86/include/asm/io.h

both has volatile.

I just copy from it. But I don't 100% understand it.

>> +{
>> +	return (unsigned long)address;
>
>This should be phys_addr_t, look at its definition in tools/include/linux/types.h
>

You are right. Will fix it.

>> +}
>> +
>>  void reserve_bootmem_region(phys_addr_t start, phys_addr_t end, int nid);
>>  
>>  static inline void totalram_pages_inc(void)
>> -- 
>> 2.34.1
>> 
>
>-- 
>Sincerely yours,
>Mike.

-- 
Wei Yang
Help you, Help me