[PATCH 1/2] mm/ptdump: Split note_page() into level specific callbacks

[Anshuman Khandual]

On 3/31/25 14:29, Alexander Gordeev wrote:
> On Mon, Mar 17, 2025 at 11:48:17AM +0530, Anshuman Khandual wrote:
> 
> Hi Anshuman,
> 
> ...
>> --- a/include/linux/ptdump.h
>> +++ b/include/linux/ptdump.h
>> @@ -11,9 +11,12 @@ struct ptdump_range {
>>  };
>>  
>>  struct ptdump_state {
>> -	/* level is 0:PGD to 4:PTE, or -1 if unknown */
>> -	void (*note_page)(struct ptdump_state *st, unsigned long addr,
>> -			  int level, u64 val);
>> +	void (*note_page_pte)(struct ptdump_state *st, unsigned long addr, pte_t pte);
>> +	void (*note_page_pmd)(struct ptdump_state *st, unsigned long addr, pmd_t pmd);
>> +	void (*note_page_pud)(struct ptdump_state *st, unsigned long addr, pud_t pud);
>> +	void (*note_page_p4d)(struct ptdump_state *st, unsigned long addr, p4d_t p4d);
>> +	void (*note_page_pgd)(struct ptdump_state *st, unsigned long addr, pgd_t pgd);
>> +	void (*note_page_flush)(struct ptdump_state *st);
>>  	void (*effective_prot)(struct ptdump_state *st, int level, u64 val);
> 
> Should you treat effective_prot() similarly?

Agreed. effective_prot() also uses pxd_val() derived data type in generic MM and
might cause the same problem later going ahead. Will split the helper into level
specific callbacks as well.

> 
>>  	const struct ptdump_range *range;
>>  };