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slub: add comments to endif pre-processor macros

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SLUB allocator makes heavy use of ifdef/endif pre-processor macros.  The
pairing of these statements is at times hard to follow e.g.  if the pair
are further than a screen apart or if there are nested pairs.  We can
reduce cognitive load by adding a comment to the endif statement of form

       #ifdef CONFIG_FOO
       ...
       #endif /* CONFIG_FOO */

Add comments to endif pre-processor macros if ifdef/endif pair is not
immediately apparent.

Link: http://lkml.kernel.org/r/20190402230545.2929-5-tobin@kernel.org
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tobin C. Harding 2019-05-13 17:16:09 -07:00 committed by Linus Torvalds
parent adab7b6818
commit 6dfd1b653c
1 changed files with 10 additions and 10 deletions
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20
mm/slub.c
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@ -1942,7 +1942,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
}
}
} while (read_mems_allowed_retry(cpuset_mems_cookie));
#endif
#endif /* CONFIG_NUMA */
return NULL;
}
@ -2240,7 +2240,7 @@ static void unfreeze_partials(struct kmem_cache *s,
discard_slab(s, page);
stat(s, FREE_SLAB);
}
#endif
#endif /* CONFIG_SLUB_CPU_PARTIAL */
}
/*
@ -2299,7 +2299,7 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
local_irq_restore(flags);
}
preempt_enable();
#endif
#endif /* CONFIG_SLUB_CPU_PARTIAL */
}
static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
@ -2804,7 +2804,7 @@ void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
}
EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
#endif
#endif
#endif /* CONFIG_NUMA */
/*
* Slow path handling. This may still be called frequently since objects
@ -3839,7 +3839,7 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node)
return ret;
}
EXPORT_SYMBOL(__kmalloc_node);
#endif
#endif /* CONFIG_NUMA */
#ifdef CONFIG_HARDENED_USERCOPY
/*
@ -4057,7 +4057,7 @@ void __kmemcg_cache_deactivate(struct kmem_cache *s)
*/
slab_deactivate_memcg_cache_rcu_sched(s, kmemcg_cache_deact_after_rcu);
}
#endif
#endif /* CONFIG_MEMCG */
static int slab_mem_going_offline_callback(void *arg)
{
@ -4690,7 +4690,7 @@ static int list_locations(struct kmem_cache *s, char *buf,
len += sprintf(buf, "No data\n");
return len;
}
#endif
#endif /* CONFIG_SLUB_DEBUG */
#ifdef SLUB_RESILIENCY_TEST
static void __init resiliency_test(void)
@ -4750,7 +4750,7 @@ static void __init resiliency_test(void)
#ifdef CONFIG_SYSFS
static void resiliency_test(void) {};
#endif
#endif
#endif /* SLUB_RESILIENCY_TEST */
#ifdef CONFIG_SYSFS
enum slab_stat_type {
@ -5407,7 +5407,7 @@ STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc);
STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free);
STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node);
STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain);
#endif
#endif /* CONFIG_SLUB_STATS */
static struct attribute *slab_attrs[] = {
&slab_size_attr.attr,
@ -5608,7 +5608,7 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s)
if (buffer)
free_page((unsigned long)buffer);
#endif
#endif /* CONFIG_MEMCG */
}
static void kmem_cache_release(struct kobject *k)