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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2012-07-31 16:42:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:40 -0700
commit972dc4de13f667a7df27ee32573b2e6fc6cc8434 (patch)
tree0d3ea1381b81700d17307fc6996a67bbabb7fac2
parent76dcee75c1aff61259f5ed55e2bcfab60cc4bd5f (diff)
hugetlb: add an inline helper for finding hstate index
Add an inline helper and use it in the code. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: David Rientjes <rientjes@google.com> Acked-by: Michal Hocko <mhocko@suse.cz> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/hugetlb.h6
-rw-r--r--mm/hugetlb.c20
2 files changed, 17 insertions, 9 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index d5d6bbe2259..217f52859fa 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -302,6 +302,11 @@ static inline unsigned hstate_index_to_shift(unsigned index)
return hstates[index].order + PAGE_SHIFT;
}
+static inline int hstate_index(struct hstate *h)
+{
+ return h - hstates;
+}
+
#else
struct hstate {};
#define alloc_huge_page_node(h, nid) NULL
@@ -320,6 +325,7 @@ static inline unsigned int pages_per_huge_page(struct hstate *h)
return 1;
}
#define hstate_index_to_shift(index) 0
+#define hstate_index(h) 0
#endif
#endif /* _LINUX_HUGETLB_H */
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 34a7e237547..b1e0ed1ea91 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1646,7 +1646,7 @@ static int hugetlb_sysfs_add_hstate(struct hstate *h, struct kobject *parent,
struct attribute_group *hstate_attr_group)
{
int retval;
- int hi = h - hstates;
+ int hi = hstate_index(h);
hstate_kobjs[hi] = kobject_create_and_add(h->name, parent);
if (!hstate_kobjs[hi])
@@ -1741,11 +1741,13 @@ void hugetlb_unregister_node(struct node *node)
if (!nhs->hugepages_kobj)
return; /* no hstate attributes */
- for_each_hstate(h)
- if (nhs->hstate_kobjs[h - hstates]) {
- kobject_put(nhs->hstate_kobjs[h - hstates]);
- nhs->hstate_kobjs[h - hstates] = NULL;
+ for_each_hstate(h) {
+ int idx = hstate_index(h);
+ if (nhs->hstate_kobjs[idx]) {
+ kobject_put(nhs->hstate_kobjs[idx]);
+ nhs->hstate_kobjs[idx] = NULL;
}
+ }
kobject_put(nhs->hugepages_kobj);
nhs->hugepages_kobj = NULL;
@@ -1848,7 +1850,7 @@ static void __exit hugetlb_exit(void)
hugetlb_unregister_all_nodes();
for_each_hstate(h) {
- kobject_put(hstate_kobjs[h - hstates]);
+ kobject_put(hstate_kobjs[hstate_index(h)]);
}
kobject_put(hugepages_kobj);
@@ -1869,7 +1871,7 @@ static int __init hugetlb_init(void)
if (!size_to_hstate(default_hstate_size))
hugetlb_add_hstate(HUGETLB_PAGE_ORDER);
}
- default_hstate_idx = size_to_hstate(default_hstate_size) - hstates;
+ default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size));
if (default_hstate_max_huge_pages)
default_hstate.max_huge_pages = default_hstate_max_huge_pages;
@@ -2687,7 +2689,7 @@ retry:
*/
if (unlikely(PageHWPoison(page))) {
ret = VM_FAULT_HWPOISON |
- VM_FAULT_SET_HINDEX(h - hstates);
+ VM_FAULT_SET_HINDEX(hstate_index(h));
goto backout_unlocked;
}
}
@@ -2760,7 +2762,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return 0;
} else if (unlikely(is_hugetlb_entry_hwpoisoned(entry)))
return VM_FAULT_HWPOISON_LARGE |
- VM_FAULT_SET_HINDEX(h - hstates);
+ VM_FAULT_SET_HINDEX(hstate_index(h));
}
ptep = huge_pte_alloc(mm, address, huge_page_size(h));