The patch titled
Subject: nvdimm/pmem: Treat alloc_dax() -EOPNOTSUPP failure as non-fatal
has been added to the -mm mm-unstable branch. Its filename is
nvdimm-pmem-treat-alloc_dax-eopnotsupp-failure-as-non-fatal.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/nvdimm-pmem-treat-alloc_dax-eopnotsupp-failure-as-non-fatal.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Mathieu Desnoyers <[email protected]>
Subject: nvdimm/pmem: Treat alloc_dax() -EOPNOTSUPP failure as non-fatal
Date: Thu, 15 Feb 2024 09:46:27 -0500
In preparation for checking whether the architecture has data cache
aliasing within alloc_dax(), modify the error handling of nvdimm/pmem
pmem_attach_disk() to treat alloc_dax() -EOPNOTSUPP failure as non-fatal.
[ Based on commit "nvdimm/pmem: Fix leak on dax_add_host() failure". ]
Link:
https://lkml.kernel.org/r/[email protected]
Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing
caches")
Signed-off-by: Mathieu Desnoyers <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Cc: Alasdair Kergon <[email protected]>
Cc: Mike Snitzer <[email protected]>
Cc: Mikulas Patocka <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Vishal Verma <[email protected]>
Cc: Dave Jiang <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Russell King <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: kernel test robot <[email protected]>
Cc: Michael Sclafani <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/nvdimm/pmem.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
---
a/drivers/nvdimm/pmem.c~nvdimm-pmem-treat-alloc_dax-eopnotsupp-failure-as-non-fatal
+++ a/drivers/nvdimm/pmem.c
@@ -560,17 +560,19 @@ static int pmem_attach_disk(struct devic
dax_dev = alloc_dax(pmem, &pmem_dax_ops);
if (IS_ERR(dax_dev)) {
rc = PTR_ERR(dax_dev);
- goto out;
+ if (rc != -EOPNOTSUPP)
+ goto out;
+ } else {
+ set_dax_nocache(dax_dev);
+ set_dax_nomc(dax_dev);
+ if (is_nvdimm_sync(nd_region))
+ set_dax_synchronous(dax_dev);
+ pmem->dax_dev = dax_dev;
+ rc = dax_add_host(dax_dev, disk);
+ if (rc)
+ goto out_cleanup_dax;
+ dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
}
- set_dax_nocache(dax_dev);
- set_dax_nomc(dax_dev);
- if (is_nvdimm_sync(nd_region))
- set_dax_synchronous(dax_dev);
- pmem->dax_dev = dax_dev;
- rc = dax_add_host(dax_dev, disk);
- if (rc)
- goto out_cleanup_dax;
- dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
rc = device_add_disk(dev, disk, pmem_attribute_groups);
if (rc)
goto out_remove_host;
_
Patches currently in -mm which might be from [email protected] are
nvdimm-pmem-fix-leak-on-dax_add_host-failure.patch
dax-add-empty-static-inline-for-config_dax=n.patch
dax-alloc_dax-return-err_ptr-eopnotsupp-for-config_dax=n.patch
nvdimm-pmem-treat-alloc_dax-eopnotsupp-failure-as-non-fatal.patch
dm-treat-alloc_dax-eopnotsupp-failure-as-non-fatal.patch
dcssblk-handle-alloc_dax-eopnotsupp-failure.patch
virtio-treat-alloc_dax-eopnotsupp-failure-as-non-fatal.patch
dax-check-for-data-cache-aliasing-at-runtime.patch
introduce-cpu_dcache_is_aliasing-across-all-architectures.patch
dax-fix-incorrect-list-of-data-cache-aliasing-architectures.patch
