linux-kernel - Re: [PATCH v5 1/2] mm: introduce helper to check slub_debug

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Date:   Mon, 5 Jul 2021 04:20:08 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     yee.lee@...iatek.com
Cc:     linux-kernel@...r.kernel.org, wsd_upstream@...iatek.com,
        nicholas.Tang@...iatek.com, Kuan-Ying.lee@...iatek.com,
        chinwen.chang@...iatek.com, Marco Elver <elver@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "open list:SLAB ALLOCATOR" <linux-mm@...ck.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v5 1/2] mm: introduce helper to check slub_debug_enabled

On Mon, Jul 05, 2021 at 10:40:57AM +0800, yee.lee@...iatek.com wrote:
> From: Marco Elver <elver@...gle.com>
> 
> Introduce a helper to check slub_debug_enabled, so that we can confine
> the use of #ifdef to the definition of the slub_debug_enabled_unlikely()
> helper.

We don't usually embed '_unlikely' in function names; we
just do:

static inline bool slub_debug_enabled(void)
{
	return static_branch_unlikely(&slub_debug_enabled);
}

eg:

static inline bool cpusets_enabled(void)
{
        return static_branch_unlikely(&cpusets_enabled_key);
}

#define cgroup_bpf_enabled(type) static_branch_unlikely(&cgroup_bpf_enabled_key[type])

static inline int ip_tunnel_collect_metadata(void)
{
        return static_branch_unlikely(&ip_tunnel_metadata_cnt);
}

static inline bool frontswap_enabled(void)
{
        return static_branch_unlikely(&frontswap_enabled_key);
}