[PATCH v5 1/2] mm: introduce helper to check slub_debug_enabled

[Matthew Wilcox]

On Mon, Jul 05, 2021 at 10:40:57AM +0800, yee.lee at mediatek.com wrote:
> From: Marco Elver <elver at google.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);
}