linux-kernel - Re: [PATCH v9 02/10] mm: Non-pmd-mappable, large folios for folio_add_new_anon

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Date: Mon, 15 Jan 2024 10:38:08 +0100
From: David Hildenbrand <david@...hat.com>
To: Ryan Roberts <ryan.roberts@....com>, Jiri Olsa <olsajiri@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Matthew Wilcox <willy@...radead.org>, Yin Fengwei <fengwei.yin@...el.com>,
 Yu Zhao <yuzhao@...gle.com>, Catalin Marinas <catalin.marinas@....com>,
 Anshuman Khandual <anshuman.khandual@....com>, Yang Shi
 <shy828301@...il.com>, "Huang, Ying" <ying.huang@...el.com>,
 Zi Yan <ziy@...dia.com>, Luis Chamberlain <mcgrof@...nel.org>,
 Itaru Kitayama <itaru.kitayama@...il.com>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
 John Hubbard <jhubbard@...dia.com>, David Rientjes <rientjes@...gle.com>,
 Vlastimil Babka <vbabka@...e.cz>, Hugh Dickins <hughd@...gle.com>,
 Kefeng Wang <wangkefeng.wang@...wei.com>, Barry Song <21cnbao@...il.com>,
 Alistair Popple <apopple@...dia.com>, linux-mm@...ck.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH v9 02/10] mm: Non-pmd-mappable, large folios for
 folio_add_new_anon_rmap()

>>> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
>>> index 485bb0389b488..929e98c629652 100644
>>> --- a/kernel/events/uprobes.c
>>> +++ b/kernel/events/uprobes.c
>>> @@ -537,7 +537,7 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm,
>>>   		}
>>>   	}
>>> -	ret = __replace_page(vma, vaddr, old_page, new_page);
>>> +	ret = __replace_page(vma, vaddr & PAGE_MASK, old_page, new_page);
>>>   	if (new_page)
>>>   		put_page(new_page);
>>>   put_old:
>>> diff --git a/mm/rmap.c b/mm/rmap.c
>>> index f5d43edad529a..a903db4df6b97 100644
>>> --- a/mm/rmap.c
>>> +++ b/mm/rmap.c
>>> @@ -1408,6 +1408,7 @@ void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma,
>>>   {
>>>   	int nr = folio_nr_pages(folio);
>>> +	VM_WARN_ON_FOLIO(!IS_ALIGNED(address, PAGE_SIZE), folio);
> 
> nit: Is it worth also adding this to __folio_add_anon_rmap() so that
> folio_add_anon_rmap_ptes() and folio_add_anon_rmap_pmd() also benefit?
> 

Yes, same thoughts. Just included it so we would catch if still 
something goes wrong here.

I'll split that change out either way.

> Regardless:
> 
> Reviewed-by: Ryan Roberts <ryan.roberts@....com>

Thanks!

-- 
Cheers,

David / dhildenb