linux-kernel - Re: [PATCH v5 4/8] dcssblk: Handle alloc

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Date: Tue, 13 Feb 2024 12:18:49 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Dan Williams <dan.j.williams@...el.com>, Arnd Bergmann <arnd@...db.de>,
        Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Russell King <linux@...linux.org.uk>, linux-arch@...r.kernel.org,
        linux-cxl@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-xfs@...r.kernel.org,
        dm-devel@...ts.linux.dev, nvdimm@...ts.linux.dev,
        linux-s390@...r.kernel.org, Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>,
        Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [PATCH v5 4/8] dcssblk: Handle alloc_dax() -EOPNOTSUPP failure

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@...icios.com>
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
..
> ---
>  drivers/s390/block/dcssblk.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)

Acked-by: Heiko Carstens <hca@...ux.ibm.com>