linux-kernel - Re: [PATCH v5 5/8] virtio: Treat alloc_dax() -EOPNOTSUPP failure as non-fatal

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Date: Tue, 13 Feb 2024 15:25:11 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Dan Williams <dan.j.williams@...el.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Arnd Bergmann <arnd@...db.de>, Dave Chinner <david@...morbit.com>,
 linux-kernel@...r.kernel.org, Andrew Morton <akpm@...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>,
 lukas@...ner.de
Subject: Re: [PATCH v5 5/8] virtio: Treat alloc_dax() -EOPNOTSUPP failure as
 non-fatal

On 2024-02-12 18:02, Dan Williams wrote:
[...]
> ...and Mathieu, this should be IS_ERR_OR_NULL() to skip an unnecessary
> call to virtio_fs_cleanup_dax() at function exit that the compiler
> should elide.

OK, so I'll go back to the previous approach for v6:

DEFINE_FREE(cleanup_dax, struct dax_dev *, if (!IS_ERR_OR_NULL(_T)) virtio_fs_cleanup_dax(_T))

and define the variable as:

struct dax_device *dax_dev __free(cleanup_dax) = NULL;

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com