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

From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Dan Williams <dan.j.williams@intel.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>, Dave Chinner <david@fromorbit.com>,
	linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Russell King <linux@armlinux.org.uk>,
	linux-arch@vger.kernel.org, linux-cxl@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-xfs@vger.kernel.org, dm-devel@lists.linux.dev,
	nvdimm@lists.linux.dev, linux-s390@vger.kernel.org,
	Alasdair Kergon <agk@redhat.com>,
	Mike Snitzer <snitzer@kernel.org>,
	Mikulas Patocka <mpatocka@redhat.com>,
	lukas@wunner.de
Subject: Re: [PATCH v5 5/8] virtio: Treat alloc_dax() -EOPNOTSUPP failure as non-fatal
Date: Tue, 13 Feb 2024 15:25:11 -0500	[thread overview]
Message-ID: <df41559a-ac4e-4daa-b3b2-e34783496be3@efficios.com> (raw)
In-Reply-To: <65caa3966caa_5a7f294cf@dwillia2-xfh.jf.intel.com.notmuch>

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