linux-kernel - Re: [PATCH v2 4/4] mm: kmemleak: kmemleak_*_phys() set address type and check PA when scan

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Date:   Tue, 7 Jun 2022 22:37:40 +0800
From:   Patrick Wang <patrick.wang.shcn@...il.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, yee.lee@...iatek.com
Subject: Re: [PATCH v2 4/4] mm: kmemleak: kmemleak_*_phys() set address type
 and check PA when scan



On 2022/6/6 23:29, Catalin Marinas wrote:
> On Fri, Jun 03, 2022 at 11:54:15AM +0800, Patrick Wang wrote:
>> diff --git a/mm/kmemleak.c b/mm/kmemleak.c
>> index 246a70b7218f..62d1ad8f8a44 100644
>> --- a/mm/kmemleak.c
>> +++ b/mm/kmemleak.c
>> @@ -1156,8 +1156,12 @@ EXPORT_SYMBOL(kmemleak_no_scan);
>>   void __ref kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count,
>>   			       gfp_t gfp)
>>   {
>> -	if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
>> -		kmemleak_alloc(__va(phys), size, min_count, gfp);
>> +	pr_debug("%s(0x%pa, %zu, %d)\n", __func__, &phys, size, min_count);
>> +
>> +	if (kmemleak_enabled && !min_count)
>> +		/* create object with OBJECT_PHYS flag */
>> +		create_object((unsigned long)phys, size, min_count,
>> +			      gfp, true);
>>   }
> 
> With an early patch, just drop min_count altogether from this API,
> assume 0.

Will do.

> 
>>   EXPORT_SYMBOL(kmemleak_alloc_phys);
>>   
>> @@ -1170,8 +1174,10 @@ EXPORT_SYMBOL(kmemleak_alloc_phys);
>>    */
>>   void __ref kmemleak_free_part_phys(phys_addr_t phys, size_t size)
>>   {
>> -	if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
>> -		kmemleak_free_part(__va(phys), size);
>> +	pr_debug("%s(0x%pa)\n", __func__, &phys);
>> +
>> +	if (kmemleak_enabled)
>> +		delete_object_part((unsigned long)phys, size, true);
>>   }
>>   EXPORT_SYMBOL(kmemleak_free_part_phys);
>>   
>> @@ -1182,8 +1188,10 @@ EXPORT_SYMBOL(kmemleak_free_part_phys);
>>    */
>>   void __ref kmemleak_not_leak_phys(phys_addr_t phys)
>>   {
>> -	if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
>> -		kmemleak_not_leak(__va(phys));
>> +	pr_debug("%s(0x%pa)\n", __func__, &phys);
>> +
>> +	if (kmemleak_enabled)
>> +		make_gray_object((unsigned long)phys, true);
>>   }
>>   EXPORT_SYMBOL(kmemleak_not_leak_phys);
> 
> This function doesn't have any callers, so please remove it.

Will do.

Thanks,
Patrick