linux-kernel - Re: [PATCH 3/6] pmem: pmem_dax_direct_access() to honor the DAXDEV_F

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Date:   Thu, 21 Oct 2021 04:23:20 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jane Chu <jane.chu@...cle.com>
Cc:     david@...morbit.com, djwong@...nel.org, dan.j.williams@...el.com,
        hch@...radead.org, vishal.l.verma@...el.com, dave.jiang@...el.com,
        agk@...hat.com, snitzer@...hat.com, dm-devel@...hat.com,
        ira.weiny@...el.com, willy@...radead.org, vgoyal@...hat.com,
        linux-fsdevel@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH 3/6] pmem: pmem_dax_direct_access() to honor the
 DAXDEV_F_RECOVERY flag

On Wed, Oct 20, 2021 at 06:10:56PM -0600, Jane Chu wrote:
> -	if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
> -					PFN_PHYS(nr_pages))))
> +	if (unlikely(!(flags & DAXDEV_F_RECOVERY) &&
> +		is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
> +				PFN_PHYS(nr_pages))))

The indentation here is pretty messed up. Something like this would
be move normal:

	if (unlikely(!(flags & DAXDEV_F_RECOVERY) &&
			is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
				    PFN_PHYS(nr_pages)))) {

but if we don't really need the unlikely we could do an actually
readable variant:

	if (!(flags & DAXDEV_F_RECOVERY) &&
	    is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512, PFN_PHYS(nr_pages)))