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[2003:cb:c719:1700:56dc:6a88:b509:d3f3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38a1c8292f4sm51029779f8f.3.2025.01.07.03.36.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jan 2025 03:36:55 -0800 (PST) Message-ID: <758c0441-2cb9-41c4-bf70-c5810726779c@redhat.com> Date: Tue, 7 Jan 2025 12:36:52 +0100 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 14/25] rmap: Add support for PUD sized mappings to rmap To: Alistair Popple , akpm@linux-foundation.org, dan.j.williams@intel.com, linux-mm@kvack.org Cc: lina@asahilina.net, zhang.lyra@gmail.com, gerald.schaefer@linux.ibm.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com References: <8830827577fec4c6c2a0135e338723a5b532a2ee.1736221254.git-series.apopple@nvidia.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 07.01.25 04:42, Alistair Popple wrote: > The rmap doesn't currently support adding a PUD mapping of a > folio. This patch adds support for entire PUD mappings of folios, > primarily to allow for more standard refcounting of device DAX > folios. Currently DAX is the only user of this and it doesn't require > support for partially mapped PUD-sized folios so we don't support for > that for now. > > Signed-off-by: Alistair Popple > > --- > > Changes for v5: > - Fixed accounting as suggested by David. > > Changes for v4: > > - New for v4, split out rmap changes as suggested by David. > --- > include/linux/rmap.h | 15 ++++++++++- > mm/rmap.c | 65 ++++++++++++++++++++++++++++++++++++++++++--- > 2 files changed, 76 insertions(+), 4 deletions(-) > > diff --git a/include/linux/rmap.h b/include/linux/rmap.h > index 683a040..7043914 100644 > --- a/include/linux/rmap.h > +++ b/include/linux/rmap.h > @@ -192,6 +192,7 @@ typedef int __bitwise rmap_t; > enum rmap_level { > RMAP_LEVEL_PTE = 0, > RMAP_LEVEL_PMD, > + RMAP_LEVEL_PUD, > }; > > static inline void __folio_rmap_sanity_checks(const struct folio *folio, > @@ -228,6 +229,14 @@ static inline void __folio_rmap_sanity_checks(const struct folio *folio, > VM_WARN_ON_FOLIO(folio_nr_pages(folio) != HPAGE_PMD_NR, folio); > VM_WARN_ON_FOLIO(nr_pages != HPAGE_PMD_NR, folio); > break; > + case RMAP_LEVEL_PUD: > + /* > + * Assume that we are creating * a single "entire" mapping of the > + * folio. Misplaced " *", can likely be fixed up when applying. Apart from that LGTM Acked-by: David Hildenbrand -- Cheers, David / dhildenb