cf7fe690ab
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@efficios.com Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches") Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Cc: Alasdair Kergon <agk@redhat.com> Cc: Mike Snitzer <snitzer@kernel.org> Cc: Mikulas Patocka <mpatocka@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <linux@armlinux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: kernel test robot <lkp@intel.com> Cc: Michael Sclafani <dm-devel@lists.linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>