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Subject: Re: [RFC PATCH 2/3] mm, memory_hotplug: deobfuscate migration part of
 offlining
To:     Michal Hocko <mhocko@kernel.org>
Cc:     linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        Oscar Salvador <OSalvador@suse.com>,
        Pavel Tatashin <pasha.tatashin@oracle.com>,
        LKML <linux-kernel@vger.kernel.org>
References: <20181120134323.13007-1-mhocko@kernel.org>
 <20181120134323.13007-3-mhocko@kernel.org>
 <f25bfa30-96cf-799c-6885-86a3a537a977@redhat.com>
 <20181120143422.GN22247@dhcp22.suse.cz>
From:   David Hildenbrand <david@redhat.com>
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Organization: Red Hat GmbH
Message-ID: <bcd55324-1dc9-904e-d457-ebce7684712f@redhat.com>
Date:   Tue, 20 Nov 2018 15:34:49 +0100
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On 20.11.18 15:34, Michal Hocko wrote:
> On Tue 20-11-18 15:26:43, David Hildenbrand wrote:
> [...]
>>> +	do {
>>> +		for (pfn = start_pfn; pfn;)
>>> +		{
>>
>> { on a new line looks weird.
>>
>>> +			/* start memory hot removal */
>>> +			ret = -EINTR;
>>
>> I think we can move that into the "if (signal_pending(current))"
>>
>> (if my eyes are not wrong, this will not be touched otherwise)
> 
> Better?
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 9cd161db3061..6bc3aee30f5e 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1592,11 +1592,10 @@ static int __ref __offline_pages(unsigned long start_pfn,
>  	}
>  
>  	do {
> -		for (pfn = start_pfn; pfn;)
> -		{
> +		for (pfn = start_pfn; pfn;) {
>  			/* start memory hot removal */
> -			ret = -EINTR;
>  			if (signal_pending(current)) {
> +				ret = -EINTR;
>  				reason = "signal backoff";
>  				goto failed_removal_isolated;
>  			}
> 

Reviewed-by: David Hildenbrand <david@redhat.com>

:)

-- 

Thanks,

David / dhildenb