The patch titled Subject: mm: add a mapping_clear_large_folios helper has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-add-a-mapping_clear_large_folios-helper.patch
This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...
This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: Christoph Hellwig hch@lst.de Subject: mm: add a mapping_clear_large_folios helper Date: Wed, 10 Jan 2024 10:21:08 +0100
Patch series "disable large folios for shmem file used by xfs xfile".
Darrick reported that the fairly new XFS xfile code blows up when force enabling large folio for shmem. This series fixes this quickly by disabling large folios for this particular shmem file for now until it can be fixed properly, which will be a lot more invasive.
This patch (of 2):
Users of shmem_kernel_file_setup might not be able to deal with large folios (yet). Give them a way to disable large folio support on their mapping.
Link: https://lkml.kernel.org/r/20240110092109.1950011-1-hch@lst.de Link: https://lkml.kernel.org/r/20240110092109.1950011-2-hch@lst.de Fixes: 137db333b2918 ("xfs: teach xfile to pass back direct-map pages to caller") Signed-off-by: Christoph Hellwig hch@lst.de Cc: Chandan Babu R chandan.babu@oracle.com Cc: Christian K��nig christian.koenig@amd.com Cc: Daniel Vetter daniel@ffwll.ch Cc: "Darrick J. Wong" djwong@kernel.org Cc: Dave Airlie airlied@gmail.com Cc: Dave Hansen dave.hansen@linux.intel.com Cc: David Howells dhowells@redhat.com Cc: Huang Rui ray.huang@amd.com Cc: Hugh Dickins hughd@google.com Cc: Jani Nikula jani.nikula@linux.intel.com Cc: Jarkko Sakkinen jarkko@kernel.org Cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Matthew Wilcox (Oracle) willy@infradead.org Cc: Maxime Ripard mripard@kernel.org Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Tvrtko Ursulin tvrtko.ursulin@linux.intel.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
include/linux/pagemap.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
--- a/include/linux/pagemap.h~mm-add-a-mapping_clear_large_folios-helper +++ a/include/linux/pagemap.h @@ -343,6 +343,20 @@ static inline void mapping_set_large_fol __set_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags); }
+/** + * mapping_clear_large_folios() - Disable large folio support for a mapping + * @mapping: The mapping. + * + * This can be called to undo the effect of mapping_set_large_folios(). + * + * Context: This should not be called while the inode is active as it + * is non-atomic. + */ +static inline void mapping_clear_large_folios(struct address_space *mapping) +{ + __clear_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags); +} + /* * Large folio support currently depends on THP. These dependencies are * being worked on but are not yet fixed. _
Patches currently in -mm which might be from hch@lst.de are
mm-add-a-mapping_clear_large_folios-helper.patch xfs-disable-large-folio-support-in-xfile_create.patch