[PATCH] vmscan.c: struct scan_control

From: Nick Piggin <nickpiggin@yahoo.com.au>

Replace lots of parameters to functions in mm/vmscan.c with a structure
struct scan_control.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>