The quilt patch titled
Subject: dcssblk: handle alloc_dax() -EOPNOTSUPP failure
has been removed from the -mm tree. Its filename was
dcssblk-handle-alloc_dax-eopnotsupp-failure.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
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/20240215144633.96437-6-mathieu.desnoyers@xxxxxxxxxxxx
Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Alasdair Kergon <agk@xxxxxxxxxx>
Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
Cc: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: kernel test robot <lkp@xxxxxxxxx>
Cc: Michael Sclafani <dm-devel@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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 mathieu.desnoyers@xxxxxxxxxxxx are
