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Thu, 28 Aug 2025 16:49:04 +0000 Received: from DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2]) by DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2%5]) with mapi id 15.20.9052.019; Thu, 28 Aug 2025 16:49:04 +0000 Date: Thu, 28 Aug 2025 17:48:56 +0100 From: Lorenzo Stoakes To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, Pavel Begunkov , Jens Axboe , Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, "Liam R. Howlett" , Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Marco Elver , Marek Szyprowski , Michal Hocko , Mike Rapoport , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org, Zi Yan Subject: Re: [PATCH v1 19/36] io_uring/zcrx: remove nth_page() usage within folio Message-ID: <4f366255-5dd9-44ac-878c-e44e557b8484@lucifer.local> References: <20250827220141.262669-1-david@redhat.com> <20250827220141.262669-20-david@redhat.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250827220141.262669-20-david@redhat.com> 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Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 28, 2025 at 12:01:23AM +0200, David Hildenbrand wrote: > Within a folio/compound page, nth_page() is no longer required. > Given that we call folio_test_partial_kmap()+kmap_local_page(), the code > would already be problematic if the pages would span multiple folios. > > So let's just assume that all src pages belong to a single > folio/compound page and can be iterated ordinarily. The dst page is > currently always a single page, so we're not actually iterating > anything. > > Reviewed-by: Pavel Begunkov > Cc: Jens Axboe > Cc: Pavel Begunkov > Signed-off-by: David Hildenbrand On basis of src pages being within the same folio, LGTM, so: Reviewed-by: Lorenzo Stoakes > --- > io_uring/zcrx.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c > index e5ff49f3425e0..18c12f4b56b6c 100644 > --- a/io_uring/zcrx.c > +++ b/io_uring/zcrx.c > @@ -975,9 +975,9 @@ static ssize_t io_copy_page(struct io_copy_cache *cc, struct page *src_page, > > if (folio_test_partial_kmap(page_folio(dst_page)) || > folio_test_partial_kmap(page_folio(src_page))) { > - dst_page = nth_page(dst_page, dst_offset / PAGE_SIZE); > + dst_page += dst_offset / PAGE_SIZE; > dst_offset = offset_in_page(dst_offset); > - src_page = nth_page(src_page, src_offset / PAGE_SIZE); > + src_page += src_offset / PAGE_SIZE; > src_offset = offset_in_page(src_offset); > n = min(PAGE_SIZE - src_offset, PAGE_SIZE - dst_offset); > n = min(n, len); > -- > 2.50.1 >