linux-kernel - Re: [PATCH] mm/memory_hotplug: Print the correct pfn in do_migrate

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Message-ID: <a0a73388-3980-478a-979c-f8cbf91d0812@fujitsu.com>
Date: Wed, 25 Sep 2024 08:59:52 +0000
From: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
To: "anshuman.khandual@....com" <anshuman.khandual@....com>
CC: "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"david@...hat.com" <david@...hat.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>,
	"osalvador@...e.de" <osalvador@...e.de>
Subject: Re: [PATCH] mm/memory_hotplug: Print the correct pfn in
 do_migrate_range()


Well, please ignore this patch, it has been fixed in 6.12 merged windows



On 25/09/2024 16:01, Li, Zhijian/李 智坚 wrote:
> Sorry for the late reply. (My company's mail server that enabling the
> DRMAC, seems not to deliver some mails to my inbox, I have to check
> mails in lore)
> 
>> On 9/24/24 15:45, Li Zhijian wrote:
>>> The pfn value needs to be retrieved correctly when PageTransHuge(page)
>> Where the pfn could have been modified with
>> pfn = page_to_pfn(head) + compound_nr(head) - 1
>> So retrieving from page will get the original pfn value ?
> 
> Yes, that's true.
> it should print the actual pfn thatfailed to isolate,\\\ Thanks Zhijian
>    
> 
>>
>>
>>> is true. Fix it by replacing the usage of 'pfn' with 'page_to_pfn(page)' > to ensure the correct pfn is printed in warning messages when
>> isolation > fails. > > Signed-off-by: Li Zhijian
>> <lizhijian@...itsu.com> > --- > mm/memory_hotplug.c | 2 +- > 1 file
>> changed, 1 insertion(+), 1 deletion(-) > > diff --git
>> a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index
>> 26790c8d5b43..000430406a9e 100644 > --- a/mm/memory_hotplug.c > +++
>> b/mm/memory_hotplug.c > @@ -1829,7 +1829,7 @@ static void
>> do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) > > }
>> else { > if (__ratelimit(&migrate_rs)) { > - pr_warn("failed to
>> isolate pfn %lx\n", pfn); > + pr_warn("failed to isolate pfn %lx\n",
>> page_to_pfn(page)); > dump_page(page, "isolation failed"); > } > }
>