diff options
| author |   Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2015-06-24 16:56:28 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-24 17:49:41 -0700 |
| commit | a9919c79359df9a706ff9e14fc0a93cd15791c9b (patch) | |
| tree | 32bb182bd88f0fb58bfe891b26290bf53b5a6d37 | |
| parent | mm/hugetlb: reduce arch dependent code about hugetlb_prefault_arch_hook (diff) | |
| download | linux-dev-a9919c79359df9a706ff9e14fc0a93cd15791c9b.tar.xz linux-dev-a9919c79359df9a706ff9e14fc0a93cd15791c9b.zip | |
mm: only define hashdist variable when needed
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>
| -rw-r--r-- | include/linux/bootmem.h | 8 | ||||
| -rw-r--r-- | mm/page_alloc.c | 2 |
2 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h index 0995c2de8162..f589222bfa87 100644 --- a/include/linux/bootmem.h +++ b/include/linux/bootmem.h @@ -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 +#ifdef CONFIG_NUMA +#define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT) +extern int hashdist; /* Distribute hashes across NUMA nodes? */ #else -#define HASHDIST_DEFAULT 0 +#define hashdist (0) #endif -extern int hashdist; /* Distribute hashes across NUMA nodes? */ #endif /* _LINUX_BOOTMEM_H */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index ebffa0e4a9c0..159dbbc3375d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -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) |