linux-kernel - RE: [PATCH] slab.h: Avoid using & for logical and of booleans

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Date:   Mon, 12 Nov 2018 09:55:23 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Vlastimil Babka' <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     'Bart Van Assche' <bvanassche@....org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Christoph Lameter <cl@...ux.com>, Roman Gushchin <guro@...com>,
        "Darryl T. Agostinelli" <dagostinelli@...il.com>
Subject: RE: [PATCH] slab.h: Avoid using & for logical and of booleans

From: Vlastimil Babka [mailto:vbabka@...e.cz]
> Sent: 09 November 2018 19:16
...
> This? Not terribly elegant, but I don't see a nicer way right now...

Maybe just have two copies of the function body?

 static __always_inline enum kmalloc_cache_type kmalloc_type(gfp_t flags)
{
#ifndef CONFIG_ZONE_DMA
	return flags & __GFP_RECLAIMABLE ? KMALLOC_RECLAIM : KMALLOC_NORMAL;
#else
	if (likely((flags & (__GFP_DMA | __GFP_RECLAIMABLE)) == 0))
		return KMALLOC_NORMAL;
	return flags & __GFP_DMA ? KMALLOC_DMA : KMALLOC_RECLAIM;
#endif
}

	David

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