Subject: Re: [PATCH 2/4] arm64: support huge vmap vmalloc

From: Nicholas Piggin <[email-masked]>
Date: Mon, 10 Jun 2019 16:14:48 +1000

Anshuman Khandual's on June 10, 2019 3:47 pm:
> 
> 
> On 06/10/2019 10:08 AM, Nicholas Piggin wrote:
>> Applying huge vmap to vmalloc requires vmalloc_to_page to walk huge
>> pages. Define pud_large and pmd_large to support this.
>> 
>> Signed-off-by: Nicholas Piggin <[email-masked]>
>> ---
>>  arch/arm64/include/asm/pgtable.h | 2 ++
>>  1 file changed, 2 insertions(+)
>> 
>> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
>> index 2c41b04708fe..30fe7b344bf7 100644
>> --- a/arch/arm64/include/asm/pgtable.h
>> +++ b/arch/arm64/include/asm/pgtable.h
>> @@ -428,6 +428,7 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
>>  				 PMD_TYPE_TABLE)
>>  #define pmd_sect(pmd)		((pmd_val(pmd) & PMD_TYPE_MASK) == \
>>  				 PMD_TYPE_SECT)
>> +#define pmd_large(pmd)		pmd_sect(pmd)
>>  
>>  #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3
>>  #define pud_sect(pud)		(0)
>> @@ -438,6 +439,7 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
>>  #define pud_table(pud)		((pud_val(pud) & PUD_TYPE_MASK) == \
>>  				 PUD_TYPE_TABLE)
>>  #endif
>> +#define pud_large(pud)		pud_sect(pud)
>>  
>>  extern pgd_t init_pg_dir[PTRS_PER_PGD];
>>  extern pgd_t init_pg_end[];
> 
> Another series (I guess not merged yet) is trying to add these wrappers
> on arm64 (https://patchwork.kernel.org/patch/10883887/).
> 

Okay good, I'll just cherry pick it for the series.

Thanks,
Nick