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Message-ID: <78b49fc7e0302be282b4fcbd3f71fa4ae38e2d5f.1725941415.git-series.apopple@nvidia.com> Date: Tue, 10 Sep 2024 14:14:33 +1000 From: Alistair Popple <apopple@...dia.com> To: dan.j.williams@...el.com, linux-mm@...ck.org Cc: Alistair Popple <apopple@...dia.com>, vishal.l.verma@...el.com, dave.jiang@...el.com, logang@...tatee.com, bhelgaas@...gle.com, jack@...e.cz, jgg@...pe.ca, catalin.marinas@....com, will@...nel.org, mpe@...erman.id.au, npiggin@...il.com, dave.hansen@...ux.intel.com, ira.weiny@...el.com, willy@...radead.org, djwong@...nel.org, tytso@....edu, linmiaohe@...wei.com, david@...hat.com, peterx@...hat.com, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org, nvdimm@...ts.linux.dev, linux-cxl@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, jhubbard@...dia.com, hch@....de, david@...morbit.com Subject: [PATCH 08/12] gup: Don't allow FOLL_LONGTERM pinning of FS DAX pages Longterm pinning of FS DAX pages should already be disallowed by various pXX_devmap checks. However a future change will cause these checks to be invalid for FS DAX pages so make folio_is_longterm_pinnable() return false for FS DAX pages. Signed-off-by: Alistair Popple <apopple@...dia.com> --- include/linux/memremap.h | 11 +++++++++++ include/linux/mm.h | 4 ++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 14273e6..6a1406a 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -187,6 +187,17 @@ static inline bool folio_is_device_coherent(const struct folio *folio) return is_device_coherent_page(&folio->page); } +static inline bool is_device_dax_page(const struct page *page) +{ + return is_zone_device_page(page) && + page_dev_pagemap(page)->type == MEMORY_DEVICE_FS_DAX; +} + +static inline bool folio_is_device_dax(const struct folio *folio) +{ + return is_device_dax_page(&folio->page); +} + #ifdef CONFIG_ZONE_DEVICE void zone_device_page_init(struct page *page); void *memremap_pages(struct dev_pagemap *pgmap, int nid); diff --git a/include/linux/mm.h b/include/linux/mm.h index ae6d713..935e493 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1989,6 +1989,10 @@ static inline bool folio_is_longterm_pinnable(struct folio *folio) if (folio_is_device_coherent(folio)) return false; + /* DAX must also always allow eviction. */ + if (folio_is_device_dax(folio)) + return false; + /* Otherwise, non-movable zone folios can be pinned. */ return !folio_is_zone_movable(folio); -- git-series 0.9.1
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