The patch titled
Subject: dcssblk: Handle alloc_dax() -EOPNOTSUPP failure
has been added to the -mm mm-unstable branch. Its filename is
dcssblk-handle-alloc_dax-eopnotsupp-failure.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/dcssblk-handle-alloc_dax-eopnotsupp-failure.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: dcssblk: Handle alloc_dax() -EOPNOTSUPP failure
Date: Thu, 15 Feb 2024 09:46:29 -0500
In preparation for checking whether the architecture has data cache
aliasing within alloc_dax(), modify the error handling of dcssblk
dcssblk_add_store() to handle alloc_dax() -EOPNOTSUPP failures.
Considering that s390 is not a data cache aliasing architecture,
and considering that DCSSBLK selects DAX, a return value of -EOPNOTSUPP
from alloc_dax() should make dcssblk_add_store() fail.
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]>
Acked-by: Heiko Carstens <[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: kernel test robot <[email protected]>
Cc: Michael Sclafani <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/s390/block/dcssblk.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/s390/block/dcssblk.c~dcssblk-handle-alloc_dax-eopnotsupp-failure
+++ a/drivers/s390/block/dcssblk.c
@@ -549,6 +549,7 @@ dcssblk_add_store(struct device *dev, st
int rc, i, j, num_of_segments;
struct dcssblk_dev_info *dev_info;
struct segment_info *seg_info, *temp;
+ struct dax_device *dax_dev;
char *local_buf;
unsigned long seg_byte_size;
@@ -677,13 +678,13 @@ dcssblk_add_store(struct device *dev, st
if (rc)
goto put_dev;
- dev_info->dax_dev = alloc_dax(dev_info, &dcssblk_dax_ops);
- if (IS_ERR(dev_info->dax_dev)) {
- rc = PTR_ERR(dev_info->dax_dev);
- dev_info->dax_dev = NULL;
+ dax_dev = alloc_dax(dev_info, &dcssblk_dax_ops);
+ if (IS_ERR(dax_dev)) {
+ rc = PTR_ERR(dax_dev);
goto put_dev;
}
- set_dax_synchronous(dev_info->dax_dev);
+ set_dax_synchronous(dax_dev);
+ dev_info->dax_dev = dax_dev;
rc = dax_add_host(dev_info->dax_dev, dev_info->gd);
if (rc)
goto out_dax;
_
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
