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: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20181105204000.129023-1-bvanassche@acm.org>
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
[not found] ` <62188a351f2249188ce654ee03c894b1@AcuMS.aculab.com>
[not found] ` <e44e6c8b-e4e4-e7cb-a5ca-88e9559eb0d7@suse.cz>
[not found] ` <3c9adab0f1f74c46a60b3d4401030337@AcuMS.aculab.com>
[not found] ` <60deb90d-e521-39e5-5072-fc9efb98e365@suse.cz>
[not found] ` <9af3ac1d43bb422cb3c41e7e8e422e6e@AcuMS.aculab.com>
[not found] ` <cbc1fc52-dc8c-aa38-8f29-22da8bcd91c1@suse.cz>
[not found] ` <20181109110019.c82fba8125d4e2891fbe4a6c@linux-foundation.org>
[not found] ` <b8ffd59b-0d15-9c98-b9ea-ad71e4c0c734@suse.cz>
[not found] ` <bf7c2a6b801a4430bf842fc20e826db6@AcuMS.aculab.com>
[not found] ` <aa5975b6-58ed-5a3e-7de1-4b1384f88457@suse.cz>
2018-11-21 13:22 ` Vlastimil Babka
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