linux-kernel - Re: [PATCH v3 3/5] kernel/power: allow hibernation with page

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Message-ID: <3028d955-5cc7-aa52-5c07-7109038fdd3e@redhat.com>
Date:   Fri, 13 Nov 2020 13:17:16 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Alexander Potapenko <glider@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mateusz Nosek <mateusznosek0@...il.com>,
        Laura Abbott <labbott@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH v3 3/5] kernel/power: allow hibernation with page_poison
 sanity checking

On 13.11.20 13:15, Vlastimil Babka wrote:
> On 11/13/20 1:10 PM, David Hildenbrand wrote:
>>> @@ -1186,12 +1194,12 @@ void clear_free_pages(void)
>>>    	if (WARN_ON(!(free_pages_map)))
>>>    		return;
>>>    
>>> -	if (IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) || want_init_on_free()) {
>>> +	if (page_poisoning_enabled() || want_init_on_free()) {
>>
>> Any reason why not to use the static version here?
> 
> It's a single check per resume, so not worth live-patching this place.

Agreed, thanks.


-- 
Thanks,

David / dhildenb