linux-kernel - Re: [PATCH] mm/mm_init.c: add debug messsge for dma zone

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Message-ID: <ccc68b26-0896-2f2d-ba54-038f34e9eaa2@redhat.com>
Date:   Wed, 7 Jun 2023 12:22:42 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...e.com>, Haifeng Xu <haifeng.xu@...pee.com>
Cc:     rppt@...nel.org, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/mm_init.c: add debug messsge for dma zone

On 07.06.23 12:16, Michal Hocko wrote:
> On Wed 07-06-23 09:07:34, Haifeng Xu wrote:
>> If freesize is less than dma_reserve, print warning message to report
>> this case.
> 
> Why?

I'd like to second that question, and add

a) Did you run into that scenario?
b) What can an admin do in that case with that error messages?

If it reveals a buggy situation, maybe a WARN_ON_ONCE() is warranted ... 
but maybe only if anybody actually ran into that issue.

-- 
Cheers,

David / dhildenb