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Subject[PATCH -V6 03/14] hugetlbfs: Add an inline helper for finding hstate index
Date
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

Add an inline helper and use it in the code.

Acked-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
include/linux/hugetlb.h | 6 ++++++
mm/hugetlb.c | 18 ++++++++++--------
2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 000837e..876457e 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -294,6 +294,11 @@ 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
@@ -312,6 +317,7 @@ 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 5a472a5..d94c987 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);
@@ -2678,7 +2680,7 @@ 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;
}
}
@@ -2751,7 +2753,7 @@ 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));
--
1.7.10


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