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| author | Dan Williams <dan.j.williams@intel.com> | 2022-03-10 06:49:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 15:23:48 +0300 |
| commit | be8ab90a3a77d0a7471655a719cce0ba1fcb0450 (patch) | |
| tree | 941518a95f31bd25506a377f2609801c1259b835 /drivers/nvdimm | |
| parent | bd4771ba2cf9e18473a42b5b70175e50d67a64bb (diff) | |
| download | linux-be8ab90a3a77d0a7471655a719cce0ba1fcb0450.tar.xz | |
nvdimm/region: Fix default alignment for small regions
[ 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: 2522afb86a8c ("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>
Diffstat (limited to 'drivers/nvdimm')
| -rw-r--r-- | drivers/nvdimm/region_devs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index 9ccf3d608799..70ad891a76ba 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -1025,6 +1025,9 @@ 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) |