linux-kernel - Re: [PATCH v4 12/15] s390: pgtable: also move pagetable_dtor() of PxD to __tlb_remove

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Message-ID: <57ea8193-2fd9-41a9-85b4-7af924f900f4@bytedance.com>
Date: Mon, 6 Jan 2025 21:34:55 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>
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Subject: Re: [PATCH v4 12/15] s390: pgtable: also move pagetable_dtor() of PxD
 to __tlb_remove_table()



On 2025/1/6 20:44, Alexander Gordeev wrote:
> On Mon, Jan 06, 2025 at 07:02:17PM +0800, Qi Zheng wrote:
>>> On Mon, Dec 30, 2024 at 05:07:47PM +0800, Qi Zheng wrote:
>>>> To unify the PxD and PTE TLB free path, also move the pagetable_dtor() of
>>>> PMD|PUD|P4D to __tlb_remove_table().
>>>
>>> The above and Subject are still incorrect: pagetable_dtor() is
>>> called from pagetable_dtor_free(), not from __tlb_remove_table().
>>
>> Hmm, __tlb_remove_table() calls pagetable_dtor_free(), so moving to
>> pagetable_dtor_free() means moving to __tlb_remove_table(). Right?
> 
> Right. But you Subject and description claim "... also move the
> pagetable_dtor()" not to pagetable_dtor_free() - which is another
> function.

OK, will change the subject and description to:

s390: pgtable: also move pagetable_dtor() of PxD to pagetable_dtor_free()

To unify the PxD and PTE TLB free path, also move the pagetable_dtor() of
PMD|PUD|P4D to pagetable_dtor_free().

But pagetable_dtor_free() is newly introduced in this patch, should it
be changed to 'move ... to pagetable_pte_dtor_free()'? But this seems
strange. :(

> 
>> And the main purpose of this patch is also to move pagetable_dtor()
>> to __tlb_remove_table(). So I think this description makes sense?
> 
> The patch makes sense, but the description it is incorrect ;)
> 
> Thanks!

Thanks!