From ed4d4902ebdd7ca8b5a51daaf6bebf4b172895cc Mon Sep 17 00:00:00 2001
From: David Rientjes <rientjes@google.com>
Date: Wed, 6 Aug 2014 16:06:54 -0700
Subject: [PATCH] mm, hugetlb: remove hugetlb_zero and hugetlb_infinity

They are unnecessary: "zero" can be used in place of "hugetlb_zero" and
passing extra2 == NULL is equivalent to infinity.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/hugetlb.h | 1 -
 kernel/sysctl.c         | 9 +++------
 mm/hugetlb.c            | 1 -
 3 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index a23c096b3080..6e6d338641fe 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -87,7 +87,6 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
 #endif
 
 extern unsigned long hugepages_treat_as_movable;
-extern const unsigned long hugetlb_zero, hugetlb_infinity;
 extern int sysctl_hugetlb_shm_group;
 extern struct list_head huge_boot_pages;
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 75b22e22a72c..75875a741b5e 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1240,8 +1240,7 @@ static struct ctl_table vm_table[] = {
 		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
 		.proc_handler	= hugetlb_sysctl_handler,
-		.extra1		= (void *)&hugetlb_zero,
-		.extra2		= (void *)&hugetlb_infinity,
+		.extra1		= &zero,
 	},
 #ifdef CONFIG_NUMA
 	{
@@ -1250,8 +1249,7 @@ static struct ctl_table vm_table[] = {
 		.maxlen         = sizeof(unsigned long),
 		.mode           = 0644,
 		.proc_handler   = &hugetlb_mempolicy_sysctl_handler,
-		.extra1		= (void *)&hugetlb_zero,
-		.extra2		= (void *)&hugetlb_infinity,
+		.extra1		= &zero,
 	},
 #endif
 	 {
@@ -1274,8 +1272,7 @@ static struct ctl_table vm_table[] = {
 		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
 		.proc_handler	= hugetlb_overcommit_handler,
-		.extra1		= (void *)&hugetlb_zero,
-		.extra2		= (void *)&hugetlb_infinity,
+		.extra1		= &zero,
 	},
 #endif
 	{
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7a0fcb33973e..d9ad93b55585 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -35,7 +35,6 @@
 #include <linux/node.h>
 #include "internal.h"
 
-const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
 unsigned long hugepages_treat_as_movable;
 
 int hugetlb_max_hstate __read_mostly;
-- 
GitLab