From: Bart Van Assche <bvanassche@acm.org>
To: Alexander Duyck <alexander.duyck@gmail.com>
Cc: linux@rasmusvillemoes.dk,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Vlastimil Babka <vbabka@suse.cz>,
Mel Gorman <mgorman@techsingularity.net>,
Christoph Lameter <cl@linux.com>,
guro@fb.com, Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH] slab.h: Avoid using & for logical and of booleans
Date: Mon, 05 Nov 2018 16:32:50 -0800 [thread overview]
Message-ID: <1541464370.196084.166.camel@acm.org> (raw)
In-Reply-To: <CAKgT0Ue59US_f-cZtoA=yVbFJ03ca5OMce2opUdQcsvgd8LWMw@mail.gmail.com>
On Mon, 2018-11-05 at 16:11 -0800, Alexander Duyck wrote:
> If we really don't care then why even bother with the switch statement
> anyway? It seems like you could just do one ternary operator and be
> done with it. Basically all you need is:
> return (defined(CONFIG_ZONE_DMA) && (flags & __GFP_DMA)) ? KMALLOC_DMA :
> (flags & __GFP_RECLAIMABLE) ? KMALLOC_RECLAIM : 0;
>
> Why bother with all the extra complexity of the switch statement?
I don't think that defined() can be used in a C expression. Hence the
IS_ENABLED() macro. If you fix that, leave out four superfluous parentheses,
test your patch, post that patch and cc me then I will add my Reviewed-by.
Bart.
next prev parent reply other threads:[~2018-11-06 0:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-05 20:40 [PATCH] slab.h: Avoid using & for logical and of booleans Bart Van Assche
2018-11-05 21:13 ` Andrew Morton
2018-11-05 21:48 ` Bart Van Assche
2018-11-05 22:14 ` Rasmus Villemoes
2018-11-05 22:40 ` Bart Van Assche
2018-11-05 22:48 ` Alexander Duyck
2018-11-06 0:01 ` Bart Van Assche
2018-11-06 0:11 ` Alexander Duyck
2018-11-06 0:32 ` Bart Van Assche [this message]
2018-11-06 17:20 ` Alexander Duyck
2018-11-06 17:48 ` Bart Van Assche
2018-11-06 18:17 ` Alexander Duyck
2018-11-06 9:45 ` William Kucharski
2018-11-06 8:40 ` Vlastimil Babka
2018-11-06 10:08 ` David Laight
2018-11-06 10:22 ` Vlastimil Babka
2018-11-06 11:07 ` David Laight
2018-11-06 12:51 ` Vlastimil Babka
2018-11-07 10:41 ` David Laight
2018-11-09 8:12 ` Vlastimil Babka
2018-11-09 19:00 ` Andrew Morton
2018-11-09 19:16 ` Vlastimil Babka
2018-11-09 19:47 ` Darryl T. Agostinelli
2018-11-09 21:31 ` Vlastimil Babka
2018-11-12 9:55 ` David Laight
2018-11-13 18:22 ` Vlastimil Babka
2018-11-21 13:22 ` Vlastimil Babka
2018-11-19 11:04 ` Pavel Machek
2018-11-19 12:51 ` Vlastimil Babka
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