From: "Verma, Vishal L" <vishal.l.verma@intel.com>
To: "joe@perches.com" <joe@perches.com>,
"Williams, Dan J" <dan.j.williams@intel.com>,
"Jiang, Dave" <dave.jiang@intel.com>,
"Busch, Keith" <keith.busch@intel.com>,
"Weiny, Ira" <ira.weiny@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dan.carpenter@oracle.com" <dan.carpenter@oracle.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
Subject: Re: [PATCH 11/13] nvdimm: Use more common logic testing styles and bare ; positions
Date: Thu, 12 Sep 2019 03:52:49 +0000 [thread overview]
Message-ID: <706f6af6a6571a3bb2d35ec332fa572a990cbc48.camel@intel.com> (raw)
In-Reply-To: <d6aa5b66936f2e0f132e893e10494aae6b74e886.1568256708.git.joe@perches.com>
On Wed, 2019-09-11 at 19:54 -0700, Joe Perches wrote:
> Avoid using uncommon logic testing styles to make the code a
> bit more like other kernel code.
>
> e.g.:
> if (foo) {
> ;
> } else {
> <code>
> }
>
> is typically written
>
> if (!foo) {
> <code>
> }
>
A lot of times the excessive inversions seem to result in a net loss of
readability - e.g.:
<snip>
> diff --git a/drivers/nvdimm/region_devs.c
> b/drivers/nvdimm/region_devs.c
> index 65df07481909..6861e0997d21 100644
> --- a/drivers/nvdimm/region_devs.c
> +++ b/drivers/nvdimm/region_devs.c
> @@ -320,9 +320,7 @@ static ssize_t set_cookie_show(struct device *dev,
> struct nd_interleave_set *nd_set = nd_region->nd_set;
> ssize_t rc = 0;
>
> - if (is_memory(dev) && nd_set)
> - /* pass, should be precluded by region_visible */;
For one, the comment is lost
> - else
> + if (!(is_memory(dev) && nd_set))
And it takes a moment to resolve between things such as:
if (!(A && B))
vs.
if (!(A) && B)
And this is especially true if 'A' and 'B' are longer function calls,
split over multiple lines, or are themselves compound 'sections'.
I'm not opposed to /all/ such transformations -- for example, the ones
where the logical inversion can be 'consumed' by toggling a comparision
operator, as you have a few times in this patch, don't sacrifice any
readibility, and perhaps even improve it.
> return -ENXIO;
>
> /*
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next prev parent reply other threads:[~2019-09-12 3:53 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-12 2:54 [PATCH 00/13] nvdimm: Use more common kernel coding style Joe Perches
2019-09-12 2:54 ` [PATCH 01/13] nvdimm: Use more typical whitespace Joe Perches
2019-09-12 12:17 ` Christoph Hellwig
2019-09-12 15:01 ` Joe Perches
2019-09-16 7:07 ` Christoph Hellwig
2019-09-12 2:54 ` [PATCH 02/13] nvdimm: Move logical continuations to previous line Joe Perches
2019-09-12 2:54 ` [PATCH 03/13] nvdimm: Use octal permissions Joe Perches
2019-09-12 2:54 ` [PATCH 04/13] nvdimm: Use a more common kernel spacing style Joe Perches
2019-09-12 2:54 ` [PATCH 05/13] nvdimm: Use "unsigned int" in preference to "unsigned" Joe Perches
2019-09-12 2:54 ` [PATCH 06/13] nvdimm: Add and remove blank lines Joe Perches
2019-09-12 2:54 ` [PATCH 07/13] nvdimm: Use typical kernel brace styles Joe Perches
2019-09-12 2:54 ` [PATCH 08/13] nvdimm: Use typical kernel style indentation Joe Perches
2019-09-12 2:54 ` [PATCH 09/13] nvdimm: btt.h: Neaten #defines to improve readability Joe Perches
2019-09-12 2:54 ` [PATCH 10/13] nvdimm: namespace_devs: Move assignment operators Joe Perches
2019-09-12 2:54 ` [PATCH 11/13] nvdimm: Use more common logic testing styles and bare ; positions Joe Perches
2019-09-12 3:52 ` Verma, Vishal L [this message]
2019-09-12 2:54 ` [PATCH 12/13] nvdimm: namespace_devs: Change progess typo to progress Joe Perches
2019-09-12 2:54 ` [PATCH 13/13] nvdimm: Miscellaneous neatening Joe Perches
2019-09-12 8:00 ` [PATCH 00/13] nvdimm: Use more common kernel coding style Dan Williams
2019-09-12 8:15 ` Joe Perches
2019-09-12 8:42 ` Miguel Ojeda
2019-09-12 14:00 ` Jeff Moyer
2019-09-12 14:06 ` Johannes Thumshirn
2019-09-12 14:35 ` Dan Williams
2019-09-12 14:21 ` Miguel Ojeda
2019-09-12 21:08 ` Joe Perches
2019-09-12 21:58 ` Miguel Ojeda
2019-09-12 22:15 ` Joe Perches
2019-09-12 22:38 ` Joe Perches
2019-09-12 23:00 ` Nick Desaulniers
2019-09-12 23:07 ` Joe Perches
2019-09-12 22:58 ` Nick Desaulniers
2019-09-12 23:26 ` clang-format and 'clang-format on' and 'clang-format off' Joe Perches
2019-09-15 18:25 ` Miguel Ojeda
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