mm: return zero_resv_unavail optimization

When checking for valid pfns in zero_resv_unavail(), it is not necessary
to verify that pfns within pageblock_nr_pages ranges are valid, only the
first one needs to be checked.  This is because memory for pages are
allocated in contiguous chunks that contain pageblock_nr_pages struct
pages.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Pavel Tatashin <[email protected]>
Signed-off-by: Masayoshi Mizuma <[email protected]>
Reviewed-by: Masayoshi Mizuma <[email protected]>
Acked-by: Naoya Horiguchi <[email protected]>
Reviewed-by: Oscar Salvador <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions