Re: [PATCH] mm: Merge pte_mkhuge() call into arch_make_huge_pte()

[Christophe Leroy]

Le 02/02/2022 à 07:18, Mike Rapoport a écrit :
> On Wed, Feb 02, 2022 at 11:08:06AM +0530, Anshuman Khandual wrote:
>> Each call into pte_mkhuge() is invariably followed by arch_make_huge_pte().
>> Instead arch_make_huge_pte() can accommodate pte_mkhuge() at the beginning.
>> This updates generic fallback stub for arch_make_huge_pte() and available
>> platforms definitions. This makes huge pte creation much cleaner and easier
>> to follow.
> 
> Won't it break architectures that don't define arch_make_huge_pte()?

It shouldn't, see below

>> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
>> index d1897a69c540..52c462390aee 100644
>> --- a/include/linux/hugetlb.h
>> +++ b/include/linux/hugetlb.h
>> @@ -754,7 +754,7 @@ static inline void arch_clear_hugepage_flags(struct page *page) { }
>>   static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
>>   				       vm_flags_t flags)
>>   {
>> -	return entry;
>> +	return pte_mkhuge(entry);
>>   }
>>   #endif
>>