[PATCH] smaps should deal with huge zero page exactly same as normal zero page

[Fengwei Yin <yfw.kernel@xxxxxxxxx>]

Hi,
Fengguang found that the RSS/PSS shown in smaps is not correct
if the file is /dev/zero.

Example:
7bea458b3000-7fea458b3000 r--p 00000000 00:13 39989
  /dev/zero
Size:           4294967296 kB
Rss:            10612736 kB
Pss:            10612736 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:  10612736 kB
Private_Dirty:         0 kB
Referenced:     10612736 kB
Anonymous:             0 kB
AnonHugePages:  10612736 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Locked:                0 kB
VmFlags: rd mr mw me

Attachment: 0001-smaps-should-deal-with-huge-zero-page-exactly-same.patch
Description: Binary data