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nvdimm/region: Fix default alignment for small regions

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[ Upstream commit d9d290d7e659e9db3e4518040cc18b97f5535f4a ]

In preparation for removing BLK aperture support the NVDIMM unit tests
discovered that the default alignment can be set higher than the
capacity of the region. Fall back to PAGE_SIZE in that case.

Given this has not been seen in the wild, elide notifying -stable.

Fixes: 2522afb86a ("libnvdimm/region: Introduce an 'align' attribute")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/164688416128.2879318.17890707310125575258.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Williams 2022-03-09 19:49:21 -08:00 committed by Greg Kroah-Hartman
parent f7210ca29a
commit 431f8a9cec
1 changed files with 3 additions and 0 deletions
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3
drivers/nvdimm/region_devs.c
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@ -1018,6 +1018,9 @@ static unsigned long default_align(struct nd_region *nd_region)
}
}
if (nd_region->ndr_size < MEMREMAP_COMPAT_ALIGN_MAX)
align = PAGE_SIZE;
mappings = max_t(u16, 1, nd_region->ndr_mappings);
div_u64_rem(align, mappings, &remainder);
if (remainder)