The patch titled Subject: dcssblk: cleanup alloc_dax() error handling has been added to the -mm mm-unstable branch. Its filename is dcssblk-cleanup-alloc_dax-error-handling.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/dcssblk-cleanup-alloc_dax-error-handling.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> Subject: dcssblk: cleanup alloc_dax() error handling Date: Thu, 8 Feb 2024 13:49:12 -0500 Now that alloc_dax() returns ERR_PTR(-EOPNOTSUPP) rather than NULL, the callers do not have to handle NULL return values anymore. Link: https://lkml.kernel.org/r/20240208184913.484340-12-mathieu.desnoyers@xxxxxxxxxxxx Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> Cc: Alasdair Kergon <agk@xxxxxxxxxx> Cc: Mike Snitzer <snitzer@xxxxxxxxxx> Cc: Mikulas Patocka <mpatocka@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> 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: Dave Chinner <david@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/s390/block/dcssblk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/s390/block/dcssblk.c~dcssblk-cleanup-alloc_dax-error-handling +++ a/drivers/s390/block/dcssblk.c @@ -679,8 +679,8 @@ dcssblk_add_store(struct device *dev, st goto put_dev; dax_dev = alloc_dax(dev_info, &dcssblk_dax_ops); - if (IS_ERR_OR_NULL(dax_dev)) { - rc = IS_ERR(dax_dev) ? PTR_ERR(dax_dev) : -EOPNOTSUPP; + if (IS_ERR(dax_dev)) { + rc = PTR_ERR(dax_dev); goto put_dev; } set_dax_synchronous(dax_dev); _ Patches currently in -mm which might be from mathieu.desnoyers@xxxxxxxxxxxx are nvdimm-pmem-fix-leak-on-dax_add_host-failure.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 nvdimm-pmem-cleanup-alloc_dax-error-handling.patch dm-cleanup-alloc_dax-error-handling.patch dcssblk-cleanup-alloc_dax-error-handling.patch virtio-cleanup-alloc_dax-error-handling.patch