tree 4771fd91ae020efaafbe653ad78ba5e32d56e8a3
parent 46fc3e7b4e7233a0ac981ac9084b55217318d04d
author Fengguang Wu <wfg@mail.ustc.edu.cn> 1184834878 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1184864683 -0700

readahead: MIN_RA_PAGES/MAX_RA_PAGES macros

Define two convenient macros for read-ahead:
	- MAX_RA_PAGES: rounded down counterpart of VM_MAX_READAHEAD
	- MIN_RA_PAGES: rounded _up_ counterpart of VM_MIN_READAHEAD

Note that the rounded up MIN_RA_PAGES will work flawlessly with _large_
page sizes like 64k.

Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Steven Pratt <slpratt@austin.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>