linux-kernel - Re: [PATCH v2] mm: Enable suspend-only swap spaces

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Message-ID: <d6f7b7a4-c27f-5ccb-c605-c16f6a7ea2e6@redhat.com>
Date:   Tue, 27 Jul 2021 14:19:02 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Michal Hocko <mhocko@...e.com>, Evan Green <evgreen@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alex Shi <alexs@...nel.org>,
        Alistair Popple <apopple@...dia.com>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Weiner <hannes@...xchg.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Minchan Kim <minchan@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v2] mm: Enable suspend-only swap spaces

On 27.07.21 14:04, Pavel Machek wrote:
> Hi!
> 
>> Let's take a look at hibernate() callers:
>>
>> drivers/mfd/tps65010.c: calls hibernate() from IRQ contex, based on HW
>>                          event
> 
> No it does not. Look again.
> 

Oh, dead code :)

>> kernel/power/autosleep.c: calls hibernate() when it thinks it might be
>>   			  a good time to go to sleep
> 
> Ok, you are right, it is there. But I don't believe anyone uses this
> configuration.

If it's dead code, we might want to look into deprecating and removing 
it. It was introduced around 2012:

https://lwn.net/Articles/479841/


-- 
Thanks,

David / dhildenb