linux-kernel - Re: [PATCH v2 4/5] mm: add largest_zero

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <bfbb1fa6-6537-4714-b5ff-a386a86c06c8@redhat.com>
Date: Tue, 15 Jul 2025 16:46:39 +0200
From: David Hildenbrand <david@...hat.com>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>,
 Suren Baghdasaryan <surenb@...gle.com>, Ryan Roberts <ryan.roberts@....com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Borislav Petkov <bp@...en8.de>,
 Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>,
 Vlastimil Babka <vbabka@...e.cz>, Zi Yan <ziy@...dia.com>,
 Mike Rapoport <rppt@...nel.org>, Dave Hansen <dave.hansen@...ux.intel.com>,
 Michal Hocko <mhocko@...e.com>, Lorenzo Stoakes
 <lorenzo.stoakes@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>,
 Thomas Gleixner <tglx@...utronix.de>, Nico Pache <npache@...hat.com>,
 Dev Jain <dev.jain@....com>, "Liam R . Howlett" <Liam.Howlett@...cle.com>,
 Jens Axboe <axboe@...nel.dk>
Cc: linux-kernel@...r.kernel.org, willy@...radead.org, linux-mm@...ck.org,
 x86@...nel.org, linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 "Darrick J . Wong" <djwong@...nel.org>, mcgrof@...nel.org,
 gost.dev@...sung.com, hch@....de, Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH v2 4/5] mm: add largest_zero_folio() routine

On 15.07.25 16:16, David Hildenbrand wrote:
> On 07.07.25 16:23, Pankaj Raghav (Samsung) wrote:
>> From: Pankaj Raghav <p.raghav@...sung.com>
>>
>> Add largest_zero_folio() routine so that huge_zero_folio can be
>> used without the need to pass any mm struct. This will return ZERO_PAGE
>> folio if CONFIG_STATIC_PMD_ZERO_PAGE is disabled or if we failed to
>> allocate a PMD page from memblock.
>>
>> This routine can also be called even if THP is disabled.
>>
>> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
>> ---
>>    include/linux/mm.h | 28 ++++++++++++++++++++++++++--
>>    1 file changed, 26 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/linux/mm.h b/include/linux/mm.h
>> index 428fe6d36b3c..d5543cf7b8e9 100644
>> --- a/include/linux/mm.h
>> +++ b/include/linux/mm.h
>> @@ -4018,17 +4018,41 @@ static inline bool vma_is_special_huge(const struct vm_area_struct *vma)
>>    
>>    #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
>>    
>> +extern struct folio *huge_zero_folio;
>> +extern unsigned long huge_zero_pfn;
> 
> No need for "extern".

Scratch that, was confused with functions ...

-- 
Cheers,

David / dhildenb