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mm: only define hashdist variable when needed

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For !CONFIG_NUMA, hashdist will always be 0, since it's setter is
otherwise compiled out.  So we can save 4 bytes of data and some .text
(although mostly in __init functions) by only defining it for
CONFIG_NUMA.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rasmus Villemoes 2015-06-24 16:56:28 -07:00 committed by Linus Torvalds
parent a67a31fa30
commit a9919c7935
2 changed files with 6 additions and 6 deletions
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10
include/linux/bootmem.h
View File

@ -357,12 +357,12 @@ extern void *alloc_large_system_hash(const char *tablename,
/* Only NUMA needs hash distribution. 64bit NUMA architectures have
* sufficient vmalloc space.
*/
#if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
#define HASHDIST_DEFAULT 1
#else
#define HASHDIST_DEFAULT 0
#endif
#ifdef CONFIG_NUMA
#define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT)
extern int hashdist; /* Distribute hashes across NUMA nodes? */
#else
#define hashdist (0)
#endif
#endif /* _LINUX_BOOTMEM_H */

2
mm/page_alloc.c
View File

@ -6013,9 +6013,9 @@ out:
return ret;
}
#ifdef CONFIG_NUMA
int hashdist = HASHDIST_DEFAULT;
#ifdef CONFIG_NUMA
static int __init set_hashdist(char *str)
{
if (!str)