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Date: Mon, 15 Jan 2024 10:38:08 +0100
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Subject: Re: [PATCH v9 02/10] mm: Non-pmd-mappable, large folios for
 folio_add_new_anon_rmap()
To: Ryan Roberts <ryan.roberts@arm.com>, Jiri Olsa <olsajiri@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
 Matthew Wilcox <willy@infradead.org>, Yin Fengwei <fengwei.yin@intel.com>,
 Yu Zhao <yuzhao@google.com>, Catalin Marinas <catalin.marinas@arm.com>,
 Anshuman Khandual <anshuman.khandual@arm.com>, Yang Shi
 <shy828301@gmail.com>, "Huang, Ying" <ying.huang@intel.com>,
 Zi Yan <ziy@nvidia.com>, Luis Chamberlain <mcgrof@kernel.org>,
 Itaru Kitayama <itaru.kitayama@gmail.com>,
 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
 John Hubbard <jhubbard@nvidia.com>, David Rientjes <rientjes@google.com>,
 Vlastimil Babka <vbabka@suse.cz>, Hugh Dickins <hughd@google.com>,
 Kefeng Wang <wangkefeng.wang@huawei.com>, Barry Song <21cnbao@gmail.com>,
 Alistair Popple <apopple@nvidia.com>, linux-mm@kvack.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 Barry Song <v-songbaohua@oppo.com>
References: <20231207161211.2374093-1-ryan.roberts@arm.com>
 <20231207161211.2374093-3-ryan.roberts@arm.com> <ZaMR2EWN-HvlCfUl@krava>
 <41dc7dff-1ea8-4894-a487-88d46ec2b2d8@redhat.com> <ZaRKMwKJIBmh8-lD@krava>
 <1188e67e-5c04-4bb5-b242-78d92c3fc85c@arm.com>
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From: David Hildenbrand <david@redhat.com>
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In-Reply-To: <1188e67e-5c04-4bb5-b242-78d92c3fc85c@arm.com>
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>>> 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@arm.com>

Thanks!

-- 
Cheers,

David / dhildenb