linux-kernel - Re: [PATCH] mm: fix misuse of update_mmu_cache() in do_anonymous

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Message-ID: <48590f80-fc58-bf67-5acf-082880a607b2@redhat.com>
Date:   Mon, 26 Sep 2022 10:32:45 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Muchun Song <muchun.song@...ux.dev>,
        Qi Zheng <zhengqi.arch@...edance.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org,
        chris@...kel.net, jcmvbkbc@...il.com, maobibo@...ngson.cn
Subject: Re: [PATCH] mm: fix misuse of update_mmu_cache() in
 do_anonymous_page()

On 25.09.22 03:43, Muchun Song wrote:
> 
> 
>> On Sep 24, 2022, at 13:32, Qi Zheng <zhengqi.arch@...edance.com> wrote:
>>
>> As message in commit 7df676974359 ("mm/memory.c: Update local TLB
>> if PTE entry exists") said, we should update local TLB only on the
>> second thread. So fix the misuse of update_mmu_cache() by using
>> update_mmu_tlb() in the do_anonymous_page().
>>
>> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> 
> The change looks good to me. However, I am not sure what is the user-visible
> effect to xtensa users. So Cc xtensa’s maintainer and the author of 7df676974359
> to double check this.

And if there is one, do we have a fixes tag?

-- 
Thanks,

David / dhildenb