• Peter Zijlstra's avatar
    mm: use refcounts for page_lock_anon_vma() · 746b18d4
    Peter Zijlstra authored
    
    
    Convert page_lock_anon_vma() over to use refcounts.  This is done to
    prepare for the conversion of anon_vma from spinlock to mutex.
    
    Sadly this inceases the cost of page_lock_anon_vma() from one to two
    atomics, a follow up patch addresses this, lets keep that simple for now.
    Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
    Reviewed-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Reviewed-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Acked-by: default avatarHugh Dickins <hughd@google.com>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: David Miller <davem@davemloft.net>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Cc: Russell King <rmk@arm.linux.org.uk>
    Cc: Paul Mundt <lethal@linux-sh.org>
    Cc: Jeff Dike <jdike@addtoit.com>
    Cc: Richard Weinberger <richard@nod.at>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: Mel Gorman <mel@csn.ul.ie>
    Cc: Nick Piggin <npiggin@kernel.dk>
    Cc: Namhyung Kim <namhyung@gmail.com>
    Signed-off-by: Andrew Morton <akpm@linux-fou...
    746b18d4
migrate.c 31.6 KB