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Subject[PATCH] Move page_assign_page_cgroup to VM_BUG_ON in free_hot_cold_page


Based on the recommendation and observations of Hugh Dickins,
page_cgroup_assign_cgroup() is not required. This patch replaces it with
a VM_BUG_ON, so that we can catch them in free_hot_cold_page()

Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
---

mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/page_alloc.c~memory-controller-move-to-bug-on-in-free_hot_cold_page mm/page_alloc.c
--- linux-2.6.24-rc5/mm/page_alloc.c~memory-controller-move-to-bug-on-in-free_hot_cold_page 2007-12-19 11:31:46.000000000 +0530
+++ linux-2.6.24-rc5-balbir/mm/page_alloc.c 2007-12-19 11:33:45.000000000 +0530
@@ -995,7 +995,7 @@ static void fastcall free_hot_cold_page(

if (!PageHighMem(page))
debug_check_no_locks_freed(page_address(page), PAGE_SIZE);
- page_assign_page_cgroup(page, NULL);
+ VM_BUG_ON(page_get_page_cgroup(page));
arch_free_page(page, 0);
kernel_map_pages(page, 1, 0);

_
--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL


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