hugetlb: add locking for overcommit sysctl
authorNishanth Aravamudan <nacc@us.ibm.com>
Fri, 8 Feb 2008 12:18:18 +0000 (04:18 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Fri, 8 Feb 2008 17:22:23 +0000 (09:22 -0800)
commita3d0c6aa1bb342b9b2c7b123b52ac2f48a4d4d0a
tree0c6766dd2add1f08c6153769c655e46ddff82a42
parentac74c00e499ed276a965e5b5600667d5dc04a84a
hugetlb: add locking for overcommit sysctl

When I replaced hugetlb_dynamic_pool with nr_overcommit_hugepages I used
proc_doulongvec_minmax() directly.  However, hugetlb.c's locking rules
require that all counter modifications occur under the hugetlb_lock.  Add a
callback into the hugetlb code similar to the one for nr_hugepages.  Grab
the lock around the manipulation of nr_overcommit_hugepages in
proc_doulongvec_minmax().

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Acked-by: Adam Litke <agl@us.ibm.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/hugetlb.h
kernel/sysctl.c
mm/hugetlb.c