Re: [PATCH v5 4/8] dcssblk: Handle alloc_dax() -EOPNOTSUPP failure

[Heiko Carstens]

On Mon, Feb 12, 2024 at 11:30:57AM -0500, Mathieu Desnoyers wrote:
> 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.
> 
> 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>
..
> ---
>  drivers/s390/block/dcssblk.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)

Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx>