[v3,1/2] mm/page_alloc: drop the unnecessary pfn_valid() for start pfn
Commit Message
__pageblock_pfn_to_page() currently performs both pfn_valid check and
pfn_to_online_page(). The former one is redundant because the latter is a
stronger check. Drop pfn_valid().
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
---
Changes from v2:
- Update the commit message per Michal. Thanks.
- Add acked tag from Michal.
Changes from v1:
- Collect reviewed tags. Thanks David and Ying.
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
@@ -1512,7 +1512,7 @@ struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
/* end_pfn is one past the range we are checking */
end_pfn--;
- if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn))
+ if (!pfn_valid(end_pfn))
return NULL;
start_page = pfn_to_online_page(start_pfn);