tree 37536aced29420e37521bb8bfaacf678b4acb397
parent af9de7eb180fa9b74c2cdc256349304a58c63c02
author Pavel Emelyanov <xemul@parallels.com> 1372888879 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1372892845 -0700

pagemap: introduce pagemap_entry_t without pmshift bits

These bits are always constant (== PAGE_SHIFT) and just occupy space in
the entry.  Moreover, in next patch we will need to report one more bit
in the pagemap, but all bits are already busy on it.

That said, describe the pagemap entry that has 6 more free zero bits.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Glauber Costa <glommer@parallels.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>